Cisco IOS IP Routing: OSPF Command Reference

show ip ospf

To display general information about Open Shortest Path First (OSPF) routing processes, use the showipospf command in user EXEC or privileged EXEC mode.

show ip ospf [process-id]

Syntax Description


`process-id`	(Optional) Process ID. If this argument is included, only information for the specified routing process is included.

Command Modes

User EXEC Privileged EXEC

Command History


Mainline Release	Modification
10.0	This command was introduced.
15.0(1)M	This command was integrated into Cisco IOS Release 15.0(1)M.
0S Release	Modification
12.0(25)S	This command was integrated into Cisco IOS Release 12.0(25)S and the output was expanded to display link-state advertisement (LSA) throttling timers.
12.0(31)S	Support for the Bidirectional Forwarding Detection (BFD) feature was added.
S Release	Modification
12.2(14)S	Support for displaying packet pacing timers was added.
12.2(28)SB	This command was integrated into Cisco IOS Release 12.2(28)SB.
12.2(18)SXE	This command was integrated into Cisco IOS Release 12.2(18)SXE and support for the BFD feature was added.
12.2(33)SRA	This command was integrated into Cisco IOS Release 12.2(33)SRA.
T Release	Modification
12.2(4)T	This command was modified to show packet pacing timers in the displayed output.
12.2(15)T	This command was modified to show additional information if the OSPF Forwarding Address Suppression in Type-5 LSAs feature is configured.
12.3(2)T	The output of this command was expanded to display LSA throttling timers and the limit on redistributed routes.
12.4(4)T	Support for the BFD feature was added.

Examples

The following is sample output from the showipospf command when entered without a specific OSPF process ID:


Router# show ip ospf
 
  Routing Process "ospf 201" with ID 10.0.0.1 and Domain ID 10.20.0.1 
  Supports only single TOS(TOS0) routes 
  Supports opaque LSA 
  SPF schedule delay 5 secs, Hold time between two SPFs 10 secs 
  Minimum LSA interval 5 secs. Minimum LSA arrival 1 secs 
  LSA group pacing timer 100 secs 
  Interface flood pacing timer 55 msecs 
  Retransmission pacing timer 100 msecs 
  Number of external LSA 0. Checksum Sum 0x0      
  Number of opaque AS LSA 0. Checksum Sum 0x0      
  Number of DCbitless external and opaque AS LSA 0 
  Number of DoNotAge external and opaque AS LSA 0 
  Number of areas in this router is 2. 2 normal 0 stub 0 nssa 
  External flood list length 0 
     Area BACKBONE(0) 
         Number of interfaces in this area is 2 
         Area has message digest authentication 
         SPF algorithm executed 4 times 
         Area ranges are 
         Number of LSA 4. Checksum Sum 0x29BEB  
         Number of opaque link LSA 0. Checksum Sum 0x0      
         Number of DCbitless LSA 3 
         Number of indication LSA 0 
         Number of DoNotAge LSA 0 
         Flood list length 0 
     Area 172.16.26.0 
         Number of interfaces in this area is 0 
         Area has no authentication 
         SPF algorithm executed 1 times 
         Area ranges are 
            192.168.0.0/16 Passive Advertise  
         Number of LSA 1. Checksum Sum 0x44FD   
         Number of opaque link LSA 0. Checksum Sum 0x0      
         Number of DCbitless LSA 1 
         Number of indication LSA 1 
         Number of DoNotAge LSA 0 
         Flood list length 0

Examples

The following is sample output from the showipospf command to verify that the BFD feature has been enabled for OSPF process 123. The relevant command output is shown in bold in the output.


Router# show ip ospf
 
 Routing Process "ospf 123" with ID 172.16.10.1
 Supports only single TOS(TOS0) routes
 Supports opaque LSA
 Supports Link-local Signaling (LLS)
 Initial SPF schedule delay 5000 msecs
 Minimum hold time between two consecutive SPFs 10000 msecs
 Maximum wait time between two consecutive SPFs 10000 msecs
 Incremental-SPF disabled
 Minimum LSA interval 5 secs
 Minimum LSA arrival 1000 msecs
 LSA group pacing timer 240 secs
 Interface flood pacing timer 33 msecs
 Retransmission pacing timer 66 msecs
 Number of external LSA 0. Checksum Sum 0x000000
 Number of opaque AS LSA 0. Checksum Sum 0x000000
 Number of DCbitless external and opaque AS LSA 0
 Number of DoNotAge external and opaque AS LSA 0
 Number of areas in this router is 1. 1 normal 0 stub 0 nssa
 External flood list length 0
   BFD is enabled
    Area BACKBONE(0)
        Number of interfaces in this area is 2
        Area has no authentication
        SPF algorithm last executed 00:00:03.708 ago
        SPF algorithm executed 27 times
        Area ranges are
        Number of LSA 3. Checksum Sum 0x00AEF1
        Number of opaque link LSA 0. Checksum Sum 0x000000
        Number of DCbitless LSA 0
        Number of indication LSA 0
        Number of DoNotAge LSA 0
        Flood list length 0

The table below describes the significant fields shown in the display.

Table 1. show ip ospf Field Descriptions
Field	Description
Routing process “ospf 201” with ID 10.0.0.1	Process ID and OSPF router ID.
Supports...	Number of types of service supported (Type 0 only).
SPF schedule delay	Delay time (in seconds) of SPF calculations.
Minimum LSA interval	Minimum interval (in seconds) between link-state advertisements.
LSA group pacing timer	Configured LSA group pacing timer (in seconds).
Interface flood pacing timer	Configured LSA flood pacing timer (in milliseconds).
Retransmission pacing timer	Configured LSA retransmission pacing timer (in milliseconds).
Number of external LSA	Number of external link-state advertisements.
Number of opaque AS LSA	Number of opaque link-state advertisements.
Number of DCbitless external and opaque AS LSA	Number of demand circuit external and opaque link-state advertisements.
Number of DoNotAge external and opaque AS LSA	Number of do not age external and opaque link-state advertisements.
Number of areas in this router is	Number of areas configured for the router.
External flood list length	External flood list length.
BFD is enabled	BFD has been enabled on the OSPF process.

The following is an excerpt of output from the showipospf command when the OSPF Forwarding Address Suppression in Type-5 LSAs feature is configured:


Router# show ip ospf
.
.
.
Area 2
   Number of interfaces in this area is 4
   It is a NSSA area
   Perform type-7/type-5 LSA translation, suppress forwarding address
.
.
.
Routing Process "ospf 1" with ID 192.168.0.1
 Supports only single TOS(TOS0) routes
 Supports opaque LSA
 Supports Link-local Signaling (LLS)
 Initial SPF schedule delay 5000 msecs
 Minimum hold time between two consecutive SPFs 10000 msecs
 Maximum wait time between two consecutive SPFs 10000 msecs
 Incremental-SPF disabled
 Minimum LSA interval 5 secs
 Minimum LSA arrival 1000 msecs
 LSA group pacing timer 240 secs
 Interface flood pacing timer 33 msecs
 Retransmission pacing timer 66 msecs
 Number of external LSA 0. Checksum Sum 0x0     
 Number of opaque AS LSA 0. Checksum Sum 0x0     
 Number of DCbitless external and opaque AS LSA 0
 Number of DoNotAge external and opaque AS LSA 0
 Number of areas in this router is 0. 0 normal 0 stub 0 nssa
 External flood list length 0

The table below describes the significant fields shown in the display.

Table 2. show ip ospf Field Descriptions
Field	Description
Area	OSPF area and tag.
Number of interfaces...	Number of interfaces configured in the area.
It is...	Possible types are internal, area border, or autonomous system boundary.
Routing process “ospf 1” with ID 192.168.0.1	Process ID and OSPF router ID.
Supports...	Number of types of service supported (Type 0 only).
Initial SPF schedule delay	Delay time of SPF calculations at startup.
Minimum hold time	Minimum hold time (in milliseconds) between consecutive SPF calculations.
Maximum wait time	Maximum wait time (in milliseconds) between consecutive SPF calculations.
Incremental-SPF	Status of incremental SPF calculations.
Minimum LSA...	Minimum time interval (in seconds) between link-state advertisements, and minimum arrival time (in milliseconds) of link-state advertisements,
LSA group pacing timer	Configured LSA group pacing timer (in seconds).
Interface flood pacing timer	Configured LSA flood pacing timer (in milliseconds).
Retransmission pacing timer	Configured LSA retransmission pacing timer (in milliseconds).
Number of...	Number and type of link-state advertisements that have been received.
Number of external LSA	Number of external link-state advertisements.
Number of opaque AS LSA	Number of opaque link-state advertisements.
Number of DCbitless external and opaque AS LSA	Number of demand circuit external and opaque link-state advertisements.
Number of DoNotAge external and opaque AS LSA	Number of do not age external and opaque link-state advertisements.
Number of areas in this router is	Number of areas configured for the router listed by type.
External flood list length	External flood list length.

The following is sample output from the showipospf command. In this example, the user had configured the redistributionmaximum-prefix command to set a limit of 2000 redistributed routes. SPF throttling was configured with the timersthrottlespf command.


Router# show ip ospf 1
 Routing Process "ospf 1" with ID 10.0.0.1
 Supports only single TOS(TOS0) routes
 Supports opaque LSA
 Supports Link-local Signaling (LLS)
 It is an autonomous system boundary router
 Redistributing External Routes from,
    static, includes subnets in redistribution
    Maximum limit of redistributed prefixes 2000
    Threshold for warning message 75%
Initial SPF schedule delay 5000 msecs
 Minimum hold time between two consecutive SPFs 10000 msecs
Maximum wait time between two consecutive SPFs 10000 msecs

The table below describes the significant fields shown in the display.

Table 3. show ip ospf Field Descriptions
Field	Description
Routing process “ospf 1” with ID 10.0.0.1	Process ID and OSPF router ID.
Supports ...	Number of Types of Service supported.
It is ...	Possible types are internal, area border, or autonomous system boundary router.
Redistributing External Routes from	Lists of redistributed routes, by protocol.
Maximum limit of redistributed prefixes	Value set in the redistributionmaximum-prefix command to set a limit on the number of redistributed routes.
Threshold for warning message	Percentage set in the redistributionmaximum-prefix command for the threshold number of redistributed routes needed to cause a warning message. The default is 75 percent of the maximum limit.
Initial SPF schedule delay	Delay (in milliseconds) before initial SPF schedule for SPF throttling. Configured with the timersthrottlespf command.
Minimum hold time between two consecutive SPFs	Minimum hold time (in milliseconds) between two consecutive SPF calculations for SPF throttling. Configured with the timersthrottlespf command.
Maximum wait time between two consecutive SPFs	Maximum wait time (in milliseconds) between two consecutive SPF calculations for SPF throttling. Configured with the timersthrottlespf command.
Number of areas	Number of areas in router, area addresses, and so on.

The following is sample output from the showipospf command. In this example, the user had configured LSA throttling, and those lines of output are displayed in bold.


Router# show ip ospf 1
Routing Process "ospf 4" with ID 10.10.24.4
 Supports only single TOS(TOS0) routes
 Supports opaque LSA
 Supports Link-local Signaling (LLS)
 Initial SPF schedule delay 5000 msecs
 Minimum hold time between two consecutive SPFs 10000 msecs
 Maximum wait time between two consecutive SPFs 10000 msecs
 Incremental-SPF disabled
 Initial LSA throttle delay 100 msecs
 Minimum hold time for LSA throttle 10000 msecs
 
Maximum wait time for LSA throttle 45000 msecs
Minimum LSA arrival 1000 msecs
 LSA group pacing timer 240 secs
 Interface flood pacing timer 33 msecs
 Retransmission pacing timer 66 msecs
 Number of external LSA 0. Checksum Sum 0x0     
 Number of opaque AS LSA 0. Checksum Sum 0x0     
 Number of DCbitless external and opaque AS LSA 0
 Number of DoNotAge external and opaque AS LSA 0
 Number of areas in this router is 1. 1 normal 0 stub 0 nssa
 External flood list length 0
    Area 24
        Number of interfaces in this area is 2
        Area has no authentication
        SPF algorithm last executed 04:28:18.396 ago
        SPF algorithm executed 8 times
        Area ranges are
        Number of LSA 4. Checksum Sum 0x23EB9 
        Number of opaque link LSA 0. Checksum Sum 0x0     
        Number of DCbitless LSA 0
        Number of indication LSA 0
        Number of DoNotAge LSA 0
        Flood list length 0

The following is sample showipospf command. In this example, the user had configured the redistributionmaximum-prefix command to set a limit of 2000 redistributed routes. SPF throttling was configured with the timersthrottlespf command.


Router# show ip ospf 1
 Routing Process "ospf 1" with ID 192.168.0.0
 Supports only single TOS(TOS0) routes
 Supports opaque LSA
 Supports Link-local Signaling (LLS)
 It is an autonomous system boundary router
 Redistributing External Routes from,
    static, includes subnets in redistribution
    Maximum limit of redistributed prefixes 2000
    Threshold for warning message 75%
Initial SPF schedule delay 5000 msecs
 Minimum hold time between two consecutive SPFs 10000 msecs
 Maximum wait time between two consecutive SPFs 10000 msecs

The table below describes the significant fields shown in the display.

Table 4. show ip ospf Field Descriptions
Field	Description
Routing process “ospf 1” with ID 192.168.0.0.	Process ID and OSPF router ID.
Supports ...	Number of TOS supported.
It is ...	Possible types are internal, area border, or autonomous system boundary routers.
Redistributing External Routes from	Lists of redistributed routes, by protocol.
Maximum limit of redistributed prefixes	Value set in the redistributionmaximum-prefix command to set a limit on the number of redistributed routes.
Threshold for warning message	Percentage set in the redistributionmaximum-prefix command for the threshold number of redistributed routes needed to cause a warning message. The default is 75 percent of the maximum limit.
Initial SPF schedule delay	Delay (in milliseconds) before the initial SPF schedule for SPF throttling. Configured with the timersthrottlespf command.
Minimum hold time between two consecutive SPFs	Minimum hold time (in milliseconds) between two consecutive SPF calculations for SPF throttling. Configured with the timersthrottlespf command.
Maximum wait time between two consecutive SPFs	Maximum wait time (in milliseconds) between two consecutive SPF calculations for SPF throttling. Configured with the timersthrottlespf command.
Number of areas	Number of areas in router, area addresses, and so on.

The following is sample output from the showipospf command. In this example, the user had configured LSA throttling, and those lines of output are displayed in bold.


Router# show ip ospf 1
Routing Process "ospf 4" with ID 10.10.24.4
 Supports only single TOS(TOS0) routes
 Supports opaque LSA
 Supports Link-local Signaling (LLS)
 Initial SPF schedule delay 5000 msecs
 Minimum hold time between two consecutive SPFs 10000 msecs
 Maximum wait time between two consecutive SPFs 10000 msecs
 Incremental-SPF disabled
 Initial LSA throttle delay 100 msecs
 Minimum hold time for LSA throttle 10000 msecs
 Maximum wait time for LSA throttle 45000 msecs
Minimum LSA arrival 1000 msecs
 LSA group pacing timer 240 secs
 Interface flood pacing timer 33 msecs
 Retransmission pacing timer 66 msecs
 Number of external LSA 0. Checksum Sum 0x0     
 Number of opaque AS LSA 0. Checksum Sum 0x0     
 Number of DCbitless external and opaque AS LSA 0
 Number of DoNotAge external and opaque AS LSA 0
 Number of areas in this router is 1. 1 normal 0 stub 0 nssa
 External flood list length 0
    Area 24
        Number of interfaces in this area is 2
        Area has no authentication
        SPF algorithm last executed 04:28:18.396 ago
        SPF algorithm executed 8 times
        Area ranges are
        Number of LSA 4. Checksum Sum 0x23EB9 
        Number of opaque link LSA 0. Checksum Sum 0x0     
        Number of DCbitless LSA 0
        Number of indication LSA 0
        Number of DoNotAge LSA 0
        Flood list length 0

show ip ospf border-routers

To display the internal Open Shortest Path First (OSPF) routing table entries to an Area Border Router (ABR) and Autonomous System Boundary Router (ASBR), use the showipospfborder-routers command in privileged EXEC mode.

show ip ospf border-routers

Syntax Description

This command has no arguments or keywords.

Command Modes

Privileged EXEC

Command History


Release	Modification
10.0	This command was introduced.
12.2(33)SRA	This command was integrated into Cisco IOS Release 12.2(33)SRA.
12.2SX	This command is supported in the Cisco IOS Release 12.2SX train. Support in a specific 12.2SX release of this train depends on your feature set, platform, and platform hardware.

Examples

The following is sample output from the showipospfborder-routers command:


Router# show ip ospf border-routers
OSPF Process 109 internal Routing Table
Codes:  i - Intra-area route, I - Inter-area route
i 192.168.97.53   [10] via 172.16.1.53,   Serial0, ABR,  Area 0.0.0.3, SPF 3
i 192.168.103.51  [10] via 192.168.96.51, Serial0, ABR,  Area 0.0.0.3, SPF 3
I 192.168.103.52  [22] via 192.168.96.51, Serial0, ASBR, Area 0.0.0.3, SPF 3
I 192.168.103.52  [22] via 172.16.1.53,   Serial0, ASBR, Area 0.0.0.3, SPF 3

The table below describes the significant fields shown in the display.

Table 5. show ip ospf border-routers Field Descriptions
Field	Description
192.168.97.53	Router ID of the destination.
[10]	Cost of using this route.
via 172.16.1.53	Next hop toward the destination.
Serial0	Interface type for the outgoing interface.
ABR	The router type of the destination; it is either an ABR or ASBR or both.
Area	The area ID of the area from which this route is learned.
SPF 3	The internal number of the shortest path first (SPF) calculation that installs this route.

show ip ospf database

To display lists of information related to the Open Shortest Path First (OSPF) database for a specific router, use the show ipospfdatabase command in EXEC mode.

show ip ospf [process-id area-id] database

show ip ospf [process-id area-id] database [adv-router [ip-address] ]

show ip ospf [process-id area-id] database [asbr-summary] [link-state-id]

show ip ospf [process-id area-id] database [asbr-summary] [link-state-id] [adv-router [ip-address] ]

show ip ospf [process-id area-id] database [asbr-summary] [link-state-id] [self-originate] [link-state-id]

show ip ospf [process-id area-id] database [database-summary]

show ip ospf [process-id] database [external] [link-state-id]

show ip ospf [process-id] database [external] [link-state-id] [adv-router [ip-address] ]

show ip ospf [process-id area-id] database [external] [link-state-id] [self-originate] [link-state-id]

show ip ospf [process-id area-id] database [network] [link-state-id]

show ip ospf [process-id area-id] database [network] [link-state-id] [adv-router [ip-address] ]

show ip ospf [process-id area-id] database [network] [link-state-id] [self-originate] [link-state-id]

show ip ospf [process-id area-id] database [nssa-external] [link-state-id]

show ip ospf [process-id area-id] database [nssa-external] [link-state-id] [adv-router [ip-address] ]

show ip ospf [process-id area-id] database [nssa-external] [link-state-id] [self-originate] [link-state-id]

show ip ospf [process-id area-id] database [router] [link-state-id]

show ip ospf [process-id area-id] database [router] [adv-router [ip-address] ]

show ip ospf [process-id area-id] database [router] [self-originate] [link-state-id]

show ip ospf [process-id area-id] database [self-originate] [link-state-id]

show ip ospf [process-id area-id] database [summary] [link-state-id]

show ip ospf [process-id area-id] database [summary] [link-state-id] [adv-router [ip-address] ]

show ip ospf [process-id area-id] database [summary] [link-state-id] [self-originate] [link-state-id]

Syntax Description


`process-id`	(Optional) Internal identification. It is locally assigned and can be any positive integer. The number used here is the number assigned administratively when enabling the OSPF routing process.
`area-id`	(Optional) Area number associated with the OSPF address range defined in the network router configuration command used to define the particular area.
adv-router [`ip-address`	(Optional) Displays all the LSAs of the specified router. If no IP address is included, the information is about the local router itself (in this case, the same as self-originate ).
`link-state-id`	(Optional) Portion of the Internet environment that is being described by the advertisement. The value entered depends on the advertisement’s LS type. It must be entered in the form of an IP address. When the link state advertisement is describing a network, the `link-state-id` can take one of two forms: The network’s IP address (as in type 3 summary link advertisements and in autonomous system external link advertisements). A derived address obtained from the link state ID. (Note that masking a network links advertisement’s link state ID with the network’s subnet mask yields the network’s IP address.) When the link state advertisement is describing a router, the link state ID is always the described router’s OSPF router ID. When an autonomous system external advertisement (LS Type = 5) is describing a default route, its link state ID is set to Default Destination (0.0.0.0).
asbr-summary	(Optional) Displays information only about the autonomous system boundary router summary LSAs.
database-summary	(Optional) Displays how many of each type of LSA for each area there are in the database, and the total.
external	(Optional) Displays information only about the external LSAs.
network	(Optional) Displays information only about the network LSAs.
nssa-external	(Optional) Displays information only about the NSSA external LSAs.
router	(Optional) Displays information only about the router LSAs.
self-originate	(Optional) Displays only self-originated LSAs (from the local router).
summary	(Optional) Displays information only about the summary LSAs.

Command Modes

EXEC

Command History


Release	Modification
10.0	This command was introduced.
11.0	The database-summary keyword was added.
12.0	The following keywords were added: self-originate adv-router
12.0(25)S	The output of the showipospfdatabasedatabase-summary command was increased to include Self-originated Type-7 and Self-originated Type-5 output.
12.2(27)SBC	This command was integrated into Cisco IOS Release 12.2(27)SBC.
12.2(33)SRA	This command was integrated into Cisco IOS Release 12.2(33)SRA.
12.2SX	This command is supported in the Cisco IOS Release 12.2SX train. Support in a specific 12.2SX release of this train depends on your feature set, platform, and platform hardware.

Usage Guidelines

The various forms of this command deliver information about different OSPF link state advertisements.

Examples

The following is sample output from the showipospfdatabase command when no arguments or keywords are used:


Router# show ip ospf database
OSPF Router with id(192.168.239.66) (Process ID 300)
                 Displaying Router Link States(Area 0.0.0.0)
  Link ID       ADV Router    Age        Seq#     Checksum  Link count
172.16.21.6   172.16.21.6    1731    0x80002CFB    0x69BC       8
172.16.21.5   172.16.21.5    1112    0x800009D2    0xA2B8       5
172.16.1.2    172.16.1.2     1662    0x80000A98    0x4CB6       9
172.16.1.1    172.16.1.1     1115    0x800009B6    0x5F2C       1
172.16.1.5    172.16.1.5     1691    0x80002BC     0x2A1A       5
172.16.65.6   172.16.65.6    1395    0x80001947    0xEEE1       4
172.16.241.5  172.16.241.5   1161    0x8000007C    0x7C70       1
172.16.27.6   172.16.27.6    1723    0x80000548    0x8641       4
172.16.70.6   172.16.70.6    1485    0x80000B97    0xEB84       6
                Displaying Net Link States(Area 0.0.0.0)
  Link ID       ADV Router      Age        Seq#        Checksum
172.16.1.3  192.168.239.66     1245    0x800000EC      0x82E
                Displaying Summary Net Link States(Area 0.0.0.0)
  Link ID       ADV Router       Age        Seq#        Checksum
172.16.240.0   172.16.241.5    1152      0x80000077      0x7A05
172.16.241.0   172.16.241.5    1152      0x80000070      0xAEB7
172.16.244.0   172.16.241.5    1152      0x80000071      0x95CB

The table below describes the significant fields shown in the display.

Table 6. show ip ospf Database Field Descriptions
Field	Description
Link ID	Router ID number.
ADV Router	Advertising router’s ID.
Age	Link state age.
Seq#	Link state sequence number (detects old or duplicate link state advertisements).
Checksum	Fletcher checksum of the complete contents of the link state advertisement.
Link count	Number of interfaces detected for router.

The following is sample output from the showipospfdatabase command with the asbr-summary keyword:


Router# show ip ospf database asbr-summary
OSPF Router with id(192.168.239.66) (Process ID 300)
                Displaying Summary ASB Link States(Area 0.0.0.0)
	LS age: 1463
	Options: (No TOS-capability)
	LS Type: Summary Links(AS Boundary Router)
	Link State ID: 172.16.245.1 (AS Boundary Router address)
	Advertising Router: 172.16.241.5
	LS Seq Number: 80000072
	Checksum: 0x3548
	Length: 28
	Network Mask: 0.0.0.0 TOS: 0  Metric: 1

The table below describes the significant fields shown in the display.

Table 7. show ip ospf database asbr-summary Field Descriptions
Field	Description
OSPF Router with id	Router ID number.
Process ID	OSPF process ID.
LS age	Link state age.
Options	Type of service options (Type 0 only).
LS Type	Link state type.
Link State ID	Link state ID (autonomous system boundary router).
Advertising Router	Advertising router’s ID.
LS Seq Number	Link state sequence (detects old or duplicate link state advertisements).
Checksum	LS checksum (Fletcher checksum of the complete contents of the link state advertisement).
Length	Length in bytes of the link state advertisement.
Network Mask	Network mask implemented.
TOS	Type of service.
Metric	Link state metric.

The following is sample output from the showipospfdatabase command with the external keyword:


Router# show ip ospf database external
OSPF Router with id(192.168.239.66) (Autonomous system 300)
                   Displaying AS External Link States
LS age: 280
Options: (No TOS-capability)
LS Type: AS External Link
Link State ID: 10.105.0.0 (External Network Number)
Advertising Router: 172.16.70.6
LS Seq Number: 80000AFD
Checksum: 0xC3A
Length: 36
Network Mask: 255.255.0.0
     		Metric Type: 2 (Larger than any link state path)
     		TOS: 0
     		Metric: 1
     		Forward Address: 0.0.0.0
     		External Route Tag: 0

The table below describes the significant fields shown in the display.

Table 8. show ip ospf database external Field Descriptions
Field	Description
OSPF Router with id	Router ID number.
Autonomous system	OSPF autonomous system number (OSPF process ID).
LS age	Link state age.
Options	Type of service options (Type 0 only).
LS Type	Link state type.
Link State ID	Link state ID (external network number).
Advertising Router	Advertising router’s ID.
LS Seq Number	Link state sequence number (detects old or duplicate link state advertisements).
Checksum	LS checksum (Fletcher checksum of the complete contents of the LSA).
Length	Length in bytes of the link state advertisement.
Network Mask	Network mask implemented.
Metric Type	External Type.
TOS	Type of service.
Metric	Link state metric.
Forward Address	Forwarding address. Data traffic for the advertised destination will be forwarded to this address. If the forwarding address is set to 0.0.0.0, data traffic will be forwarded instead to the advertisement’s originator.
External Route Tag	External route tag, a 32-bit field attached to each external route. This is not used by the OSPF protocol itself.

The following is sample output from the showipospfdatabase command with the network keyword:


Router# show ip ospf database network
 OSPF Router with id(192.168.239.66) (Process ID 300)
                Displaying Net Link States(Area 0.0.0.0)
LS age: 1367
Options: (No TOS-capability)
LS Type: Network Links
Link State ID: 172.16.1.3 (address of Designated Router)
Advertising Router: 192.168.239.66
LS Seq Number: 800000E7
Checksum: 0x1229
Length: 52
Network Mask: 255.255.255.0
        Attached Router: 192.168.239.66
        Attached Router: 172.16.241.5
        Attached Router: 172.16.1.1
        Attached Router: 172.16.54.5
        Attached Router: 172.16.1.5

The table below describes the significant fields shown in the display.

Table 9. show ip ospf database network Field Descriptions
Field	Description
OSPF Router with id	Router ID number.
Process ID 300	OSPF process ID.
LS age	Link state age.
Options	Type of service options (Type 0 only).
LS Type:	Link state type.
Link State ID	Link state ID of designated router.
Advertising Router	Advertising router’s ID.
LS Seq Number	Link state sequence (detects old or duplicate link state advertisements).
Checksum	LS checksum (Fletcher checksum of the complete contents of the link state advertisement).
Length	Length in bytes of the link state advertisement.
Network Mask	Network mask implemented.
AS Boundary Router	Definition of router type.
Attached Router	List of routers attached to the network, by IP address.

The following is sample output from the showipospfdatabase command with the router keyword:


Router# show ip ospf database router
OSPF Router with id(192.168.239.66) (Process ID 300)
Displaying Router Link States(Area 0.0.0.0)
LS age: 1176
Options: (No TOS-capability)
LS Type: Router Links
Link State ID: 172.16.21.6
Advertising Router: 172.16.21.6
LS Seq Number: 80002CF6
Checksum: 0x73B7
Length: 120
AS Boundary Router
155   Number of Links: 8
Link connected to: another Router (point-to-point)
(link ID) Neighboring Router ID: 172.16.21.5
(Link Data) Router Interface address: 172.16.21.6
Number of TOS metrics: 0
TOS 0 Metrics: 2

The table below describes the significant fields shown in the display.

Table 10. show ip ospf database router Field Descriptions
Field	Description
OSPF Router with id	Router ID number.
Process ID	OSPF process ID.
LS age	Link state age.
Options	Type of service options (Type 0 only).
LS Type	Link state type.
Link State ID	Link state ID.
Advertising Router	Advertising router’s ID.
LS Seq Number	Link state sequence (detects old or duplicate link state advertisements).
Checksum	LS checksum (Fletcher checksum of the complete contents of the link state advertisement).
Length	Length in bytes of the link state advertisement.
AS Boundary Router	Definition of router type.
Number of Links	Number of active links.
link ID	Link type.
Link Data	Router interface address.
TOS	Type of service metric (Type 0 only).

The following is sample output from showipospfdatabase command with the summary keyword:


Router# show ip ospf database summary
       OSPF Router with id(192.168.239.66) (Process ID 300)
                Displaying Summary Net Link States(Area 0.0.0.0)
LS age: 1401
Options: (No TOS-capability)
LS Type: Summary Links(Network)
Link State ID: 172.16.240.0 (summary Network Number)
Advertising Router: 172.16.241.5
LS Seq Number: 80000072
Checksum: 0x84FF
Length: 28
Network Mask: 255.255.255.0   TOS: 0  Metric: 1

The table below describes the significant fields shown in the display.

Table 11. show ip ospf database summary Field Descriptions
Field	Description
OSPF Router with id	Router ID number.
Process ID	OSPF process ID.
LS age	Link state age.
Options	Type of service options (Type 0 only).
LS Type	Link state type.
Link State ID	Link state ID (summary network number).
Advertising Router	Advertising router’s ID.
LS Seq Number	Link state sequence (detects old or duplicate link state advertisements).
Checksum	LS checksum (Fletcher checksum of the complete contents of the link state advertisement).
Length	Length in bytes of the link state advertisement.
Network Mask	Network mask implemented.
TOS	Type of service.
Metric	Link state metric.

The following is sample output from showipospfdatabase command with the database-summary keyword:


Router# show ip ospf database database-summary
OSPF Router with ID (10.0.0.1) (Process ID 1)
Area 0 database summary
  LSA Type      Count    Delete   Maxage
  Router        3        0        0
  Network       0        0        0
  Summary Net   0        0        0
  Summary ASBR  0        0        0
  Type-7 Ext    0        0        0
    Self-originated Type-7  0
Opaque Link     0        0        0
  Opaque Area   0        0        0
  Subtotal      3        0        0
Process 1 database summary
  LSA Type      Count    Delete   Maxage
  Router        3        0        0
  Network       0        0        0
  Summary Net   0        0        0
  Summary ASBR  0        0        0
  Type-7 Ext    0        0        0
  Opaque Link   0        0        0
  Opaque Area   0        0        0
  Type-5 Ext    0        0        0
      Self-originated Type-5  200
Opaque AS       0        0        0
  Total       203        0        0

The table below describes the significant fields shown in the display.

Table 12. show ip ospf database database-summary Field Descriptions
Field	Description
Area 0 database summary	Area number.
Count	Count of LSAs of the type identified in the first column.
Router	Number of router link state advertisements in that area.
Network	Number of network link state advertisements in that area.
Summary Net	Number of summary link state advertisements in that area.
Summary ASBR	Number of summary autonomous system boundary router (ASBR) link state advertisements in that area.
Type-7 Ext	Type-7 LSA count.
Self-originated Type-7	Self-originated Type-7 LSA.
Opaque Link	Type-9 LSA count.
Opaque Area	Type-10 LSA count
Subtotal	Sum of LSAs for that area.
Delete	Number of link state advertisements that are marked “Deleted” in that area.
Maxage	Number of link state advertisements that are marked “Maxaged” in that area.
Process 1 database summary	Database summary for the process.
Count	Count of LSAs of the type identified in the first column.
Router	Number of router link state advertisements in that process.
Network	Number of network link state advertisements in that process.
Summary Net	Number of summary link state advertisements in that process.
Summary ASBR	Number of summary autonomous system boundary router (ASBR) link state advertisements in that process.
Type-7 Ext	Type-7 LSA count.
Opaque Link	Type-9 LSA count.
Opaque Area	Type-10 LSA count.
Type-5 Ext	Type-5 LSA count.
Self-Originated Type-5	Self-originated Type-5 LSA count.
Opaque AS	Type-11 LSA count.
Total	Sum of LSAs for that process.
Delete	Number of link state advertisements that are marked “Deleted” in that process.
Maxage	Number of link state advertisements that are marked “Maxaged” in that process.

show ip ospf events

To display the IP Open Shortest Path First (OSPF) events information, use the show ip ospf events command in user EXEC or privileged EXEC mode.

show ip ospf events [generic] [interface] [lsa] [neighbor] [reverse] [rib] [spf]

Syntax Description


generic	(Optional) Displays the generic event information.
interface	(Optional) Displays the interface state change event information.
lsa	(Optional) Displays the OSPF Link State Advertisements (LSA) arrival and LSA generation event information.
neighbor	(Optional) Displays the neighbor state change event information.
reverse	(Optional) Displays the events in reverse order.
rib	(Optional) Displays the Routing Information Base (RIB) update, delete, and redistribution event information.
spf	(Optional) Displays the Shortest Path First (SPF) scheduling and SPF run information.

Command Modes

User EXEC (>) Privileged EXEC (#)

Command History


Release	Modification
12.3(33)SRC	This command was introduced in a release earlier than Cisco IOS Release 12.3(33)SRC.
12.3(33)SRD	This command was integrated into a release earlier than Cisco IOS Release 12.3(33)SRD.
Cisco IOS XE 2.1	This command was integrated into Cisco IOS XE Release 2.1.

Examples

The following is sample output from the show ip ospf events command. The fields are self-explanatory.


Router# show ip ospf events
OSPF Router with ID (4.4.4.4) (Process ID 1)
1    Jan 22 01:51:03.090: DB free:  1.1.1.10x6CF250 103
2    Jan 22 01:51:03.090: delete MAXAGE lsa:  0x666CF2500x666CF250
3    Jan 22 01:50:56.086: DB free:  1.1.1.10x6025D4 103
4    Jan 22 01:50:56.086: DB free:  1.1.1.10x6D59A0 103
5    Jan 22 01:50:56.082: Insert MAXAGE lsa:  0x666D59A01.1.1.1
6    Jan 22 01:50:55.590: Timer Exp:  if_ack_delayed0x64782774
7    Jan 22 01:50:55.590: Timer Exp:  if_ack_delayed0x64786CB4
8    Jan 22 01:50:55.586: Timer Exp:  if_ack_delayed0x647CD1A8
9    Jan 22 01:50:55.586: Timer Exp:  if_ack_delayed0x647C8134
10   Jan 22 01:50:53.586: Insert MAXAGE lsa:  0x666025D41.1.1.1
11   Jan 22 01:50:53.586: Rcv Changed Type-3 LSA, LSID 1.1.1.1, Adv-Rtr 3.3.3.3, Seq# 80000002, Age 3600, Area 1
12   Jan 22 01:50:53.586: Insert MAXAGE lsa:  0x666D59A01.1.1.1
13   Jan 22 01:50:53.586: Generate Changed Type-3 LSA, LSID 1.1.1.1, Seq# 80000002, Age 3600, Area 0
14   Jan 22 01:50:53.290: End of SPF, Topo Base, SPF time 4ms, next wait-interval 200ms
15   Jan 22 01:50:53.290: Generic:  ospf_external_route_sync0x1
16   Jan 22 01:50:53.290: Generic:  ospf_external_route_sync0x0
17   Jan 22 01:50:53.290: Generic:  ospf_external_route_sync0x0
18   Jan 22 01:50:53.290: Starting External processing, Topo Base in area 1
19   Jan 22 01:50:53.290: Starting External processing, Topo Base in area 0
20   Jan 22 01:50:53.286: Starting External processing, Topo Base
21   Jan 22 01:50:53.286: Generic:  ospf_inter_route_sync0x0
22   Jan 22 01:50:53.286: Starting summary processing, Topo Base, Area 0
23   Jan 22 01:50:53.286: Generic:  ospf_inter_route_sync0x1
24   Jan 22 01:50:53.286: Generic:  post_spf_intra0x0
25   Jan 22 01:50:53.286: Generic:  ospf_intra_route_sync0x1
26   Jan 22 01:50:53.286: Generic:  update_rtr_route0x1
27   Jan 22 01:50:53.286: Generic:  update_rtr_route0x1
28   Jan 22 01:50:53.286: Generic:  update_rtr_route0x1
29   Jan 22 01:50:53.286: Starting Intra-Area SPF, Topo Base, Area 1, spf_type Full
30   Jan 22 01:50:53.286: Starting SPF, Topo Base, wait-interval 200ms
31   Jan 22 01:50:53.118: Rcv New Type-3 LSA, LSID 1.1.1.1, Adv-Rtr 3.3.3.3, Seq# 80000001, Age 1, Area 1
32   Jan 22 01:50:53.118: DB add:  1.1.1.10x6025D4 103
33   Jan 22 01:50:53.090: Insert MAXAGE lsa:  0x666CF2501.1.1.1
34   Jan 22 01:50:53.090: Rcv Changed Type-3 LSA, LSID 1.1.1.1, Adv-Rtr 3.3.3.3, Seq# 80000002, Age 3600, Area 0
35   Jan 22 01:50:53.086: Rcv Changed Type-1 LSA, LSID 1.1.1.1, Adv-Rtr 1.1.1.1, Seq# 80000008, Age 2, Area 1
36   Jan 22 01:50:53.086: Schedule SPF, Topo Base, Area 1, spf-type Full, Change in LSA Type R, LSID 1.1.1.1, Adv-Rtr 1.1.1.1
37   Jan 22 01:50:46.310: Timer Exp:  exfaddr0x0
38   Jan 22 01:50:16.310: Timer Exp:  exfaddr0x0

show ip ospf fast-reroute

To display information for an Open Shortest Path First (OSPF) per-prefix loop-free alternate (LFA) fast reroute (FRR) configuration, use the show ip ospf fast-reroute command in privileged EXEC mode.

show ip ospf [process-id] fast-reroute [prefix-summary | remote-lfa tunnels]

Syntax Description


`process-id`	(Optional) Internal identification. It is locally assigned and can be any positive integer. The number used here is the number assigned administratively when enabling the OSPF routing process.
prefix-summary	(Optional) Displays information about prefixes protected by LFA FRR repair paths.
remote-lfa tunnels	(Optional) Displays information about tunnel interfaces created by remote LFA FRR.

Command Modes

Privileged EXEC (#)

Command History


Release	Modification
15.1(3)S	This command was introduced.
Cisco IOS XE Release 3.4S	This command was integrated into Cisco IOS XE Release 3.4S.
15.2(2)S	This command was modified. The remote-lfa tunnels keyword was added.
15.2(2)SNI	This command was implemented on the Cisco ASR 901 Series Aggregation Services Routers.

Usage Guidelines

Use the show ip ospf fast-reroute command to display information on the current tiebreaker policy. Use the prefix-summary keyword to display the number of prefixes per area, per priority, and how many that, in absolute numbers and in percentages, have repair paths.

Use the remote-lfa tunnels keyword to display information about tunnel interfaces created by remote LFA FRR using the fast-reroute per-prefix remote-lfa tunnel command.

Examples

The following example displays summary information about LFA FRR status, including the current tiebreaker policy:


Router# show ip ospf fast-reroute
 
            OSPF Router with ID (192.1.1.1) (Process ID 1)
Loop-free Fast Reroute protected prefixes:
           Area        Topology name   Priority
              1                 Base        Low
   172.69.69.66                 Base       High
    AS external                 Base        Low
  Repair path selection policy tiebreaks:
     23  srlg
     34  lowest-metric
     67  primary-path (required)
    256  load-sharing
Last SPF calculation started 00:00:11 ago and was running for 20 ms.

The table below describes the significant fields shown in the display.

Table 13. show ip ospf fast-reroute Field Descriptions
Field	Description
Priority	Priority assigned to the protected prefix.
Repair path selection policy tiebreaks	Tiebreaking policy attributes and their priority-index assignments.

The following example displays information about prefixes that are protected by the OSPFv2 loop-free alternate FRR feature. It displays information on the number of prefixes by area and by priority (high or low) and how many are protected, that is, have repair paths configured.


Router# show ip ospf fast-reroute prefix-summary
 
            OSPF Router with ID (192.1.1.1) (Process ID 1)
                        Base Topology (MTID 0)
Area 0:
Interface        Protected   Primary paths   Protected paths   Percent protected
                             All High  Low    All High  Low      All High  Low
Loopback0              Yes     0    0    0      0    0    0       0%   0%   0%
Ethernet0/3            Yes     1    1    0      0    0    0       0%   0%   0%
Ethernet0/2            Yes     3    2    1      2    1    1      66%  50% 100%
Ethernet0/1            Yes     2    1    1      2    1    1     100% 100% 100%
Ethernet0/0            Yes     4    2    2      4    2    2     100% 100% 100%
Area total:                   10    6    4      8    4    4      80%  66% 100%
Process total:                10    6    4      8    4    4      80%  66% 100%

The following example displays information about tunnel interfaces created by remote LFA FRR:


Router# show ip ospf fast-reroute remote-lfa tunnels             

			        OSPF Router with ID (192.168.1.1) (Process ID 1)
                      Area with ID (0)
                     Base Topology (MTID 0)

Interface MPLS-Remote-Lfa3
   Tunnel type: MPLS-LDP
   Tailend router ID: 192.168.3.3
   Termination IP address: 192.168.3.3
   Outgoing interface: Ethernet0/0
   First hop gateway: 192.168.14.4
   Tunnel metric: 20
   Protects:
     192.168.12.2 Ethernet0/1, total metric 30

Related Commands


Command	Description
debug ip ospf fast-reroute	Displays debugging information for per-prefix LFA FRR paths.
fast-reroute keep-all-paths	Keeps a list of all the candidate repair paths that were considered when a per-prefix LFA FRR path was computed.
fast-reroute per-prefix (OSPF)	Configures a per-prefix LFA FRR path that redirects traffic to an alternative next hop other than the primary neighbor.
fast-reroute per-prefix remote-lfa maximum-cost	Configures the maximum distance to the tunnel endpoint.
fast-reroute per-prefix remote-lfa tunnel	Configures a per-prefix LFA FRR path that redirects traffic to a remote LFA.
fast-reroute tie-break (OSPF)	Configures the LFA FRR tiebreaking priority.
ip ospf fast-reroute per-prefix	Configures an interface as either protecting or protected.
prefix-priority	Configures a set of prefixes to have high priority for protection in an OSPF local RIB.
show ip ospf neighbor	Displays OSPF neighbor information on a per-interface basis.
show ip ospf rib	Displays information for the OSPF local RIB or locally redistributed routes.

show ip ospf flood-list

To display a list of Open Shortest Path First (OSPF) link-state advertisements (LSAs) waiting to be flooded over an interface, use the showipospfflood-list command in EXEC mode.

show ip ospf flood-list commandshow ip ospf flood-list interface-type interface-number

Syntax Description


`interface-type`	Interface type over which the LSAs will be flooded.
`interface-number`	Interface number over which the LSAs will be flooded.

Command Modes

EXEC

Command History


Release	Modification
12.0(1)T	This command was introduced.
12.2(33)SRA	This command was integrated into Cisco IOS Release 12.2(33)SRA.
12.2SX	This command is supported in the Cisco IOS Release 12.2SX train. Support in a specific 12.2SX release of this train depends on your feature set, platform, and platform hardware.

Usage Guidelines

Use this command to observe OSPF packet pacing.

Examples

The following is sample output of the showipospfflood-list command:


Router# show ip ospf flood-list ethernet 1
 Interface Ethernet1, Queue length 20
 Link state flooding due in 12 msec
 
 Type  LS ID            ADV RTR           Seq NO      Age    Checksum
    5  10.2.195.0       192.168.0.163     0x80000009  0      0xFB61  
    5  10.1.192.0       192.168.0.163     0x80000009  0      0x2938  
    5  10.2.194.0       192.168.0.163     0x80000009  0      0x757   
    5  10.1.193.0       192.168.0.163     0x80000009  0      0x1E42  
    5  10.2.193.0       192.168.0.163     0x80000009  0      0x124D  
    5  10.1.194.0       192.168.0.163     0x80000009  0      0x134C

The table below describes the significant fields shown in the display.

Table 14. show ip ospf flood-list Field Descriptions
Field	Description
Interface Ethernet1	Interface for which information is displayed.
Queue length	Number of LSAs waiting to be flooded.
Link state flooding due in	Length of time before next link-state transmission.
Type	Type of LSA.
LS ID	Link-state ID of the LSA.
ADV RTR	IP address of advertising router.
Seq NO	Sequence number of LSA.
Age	Age of LSA (in seconds).
Checksum	Checksum of LSA.

show ip ospf interface

To display interface information related to Open Shortest Path First (OSPF), use the show ip ospf interface command in user EXEC or privileged EXEC mode.

show ip [ospf] [process-id] interface [type number] [brief] [multicast] [topology {topology-name | base}]

Syntax Description


`process-id`	(Optional) Process ID number. If this argument is included, only information for the specified routing process is included. The range is 1 to 65535.
`type`	(Optional) Interface type. If the `type` argument is included, only information for the specified interface type is included.
`number`	(Optional) Interface number. If the `number` argument is included, only information for the specified interface number is included.
brief	(Optional) Displays brief overview information for OSPF interfaces, states, addresses and masks, and areas on the device.
multicast	(Optional) Displays multicast information.
topology `topology-name`	(Optional) Displays OSPF-related information about the named topology instance.
topology base	(Optional) Displays OSPF-related information about the base topology.

Command Modes

User EXEC (>)

Privileged EXEC (#)

Command History


Release	Modification
10.0	This command was introduced.
12.0(25)S	This command was modified. The brief keyword was added.
12.2(15)T	This command was modified. The brief keyword was added.
12.2(33)SRA	This command was integrated into Cisco IOS Release 12.2(33)SRA.
12.2(33)SRB	The multicast , topology , base , and `topology-name` keywords and argument were added.
12.2SX	This command is supported in the Cisco IOS Release 12.2SX train. Support in a specific 12.2SX release of this train depends on your feature set, platform, and platform hardware.
12.2(33)SRC	Support for the OSPF TTL Security Check feature was added.
15.0(1)M	This command was integrated into Cisco IOS Release 15.0(1)M.
15.1(3)S	This command was modified to display output when loop-free alternate (LFA) Fast Reroute (FRR) is enabled on an interface and whether it can be a protected or a protecting interface.

Examples

The following is sample output from the show ip ospf interface command when Ethernet interface 0/0 is specified. It shows that LFA and FRR is enabled on the interface and that it can be both a protected and a protecting interface.


Device# show ip ospf interface ethernet 0/0

Ethernet0/0 is up, line protocol is up
  Internet Address 192.168.254.202/24, Area 0
  Process ID 1, Router ID 192.168.99.1, Network Type BROADCAST, Cost: 10
  Topology-MTID    Cost    Disabled    Shutdown      Topology Name
        0           10        no          no            Base
  Transmit Delay is 1 sec, State DR, Priority 1
  Designated Router (ID) 192.168.99.1, Interface address 192.168.254.202
  Backup Designated router (ID) 192.168.254.10, Interface address 192.168.254.10
  Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
    oob-resync timeout 40
    Hello due in 00:00:05
  Supports Link-local Signaling (LLS)
  Cisco NSF helper support enabled
  IETF NSF helper support enabled
  Can be protected by per-prefix Loop-free FastReroute
  Can be used for per-prefix Loop-free FastReroute repair paths
  Index 1/1, flood queue length 0
  Next 0x0(0)/0x0(0)
  Last flood scan length is 1, maximum is 1
  Last flood scan time is 0 msec, maximum is 0 msec
  Neighbor Count is 1, Adjacent neighbor count is 1 
    Adjacent with neighbor 192.168.254.10  (Backup Designated Router)
  Suppress hello for 0 neighbor(s)

In Cisco IOS Release 12.2(33)SRB, the following sample output from the show ip ospf interface brief topology VOICE command shows a summary of information, including a confirmation that the Multitopology Routing (MTR) VOICE topology is configured in the interface configuration:


Device# show ip ospf interface brief topology VOICE

VOICE Topology (MTID 10)
Interface    PID   Area            IP Address/Mask    Cost  State Nbrs F/C
Lo0          1     0               10.0.0.2/32        1     LOOP  0/0
Se2/0        1     0               10.1.0.2/30        10    P2P   1/1

The following sample output from the show ip ospf interface brief topology VOICE command displays details of the MTR VOICE topology for the interface. When the command is entered without the brief keyword, more information is displayed.


Device# show ip ospf interface topology VOICE

                 VOICE Topology (MTID 10)
Loopback0 is up, line protocol is up
   Internet Address 10.0.0.2/32, Area 0
   Process ID 1, Router ID 10.0.0.2, Network Type LOOPBACK
   Topology-MTID    Cost    Disabled    Shutdown      Topology Name
         10          1         no          no            VOICE
   Loopback interface is treated as a stub Host Serial2/0 is up, line protocol is up
   Internet Address 10.1.0.2/30, Area 0
   Process ID 1, Router ID 10.0.0.2, Network Type POINT_TO_POINT
   Topology-MTID    Cost    Disabled    Shutdown      Topology Name
         10          10        no          no            VOICE
   Transmit Delay is 1 sec, State POINT_TO_POINT
   Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
     oob-resync timeout 40
     Hello due in 00:00:03
   Supports Link-local Signaling (LLS)
   Cisco NSF helper support enabled
   IETF NSF helper support enabled
   Index 1/1, flood queue length 0
   Next 0x0(0)/0x0(0)
   Last flood scan length is 1, maximum is 1
   Last flood scan time is 0 msec, maximum is 0 msec
   Neighbor Count is 1, Adjacent neighbor count is 1
     Adjacent with neighbor 10.0.0.1
   Suppress hello for 0 neighbor(s)

In Cisco IOS Release 12.2(33)SRC, the following sample output from the show ip ospf interface command displays details about the configured Time-to-Live (TTL) limits:

Device# show ip ospf interface ethernet 0
.
.
.
Strict TTL checking enabled
! or a message similar to the following is displayed
Strict TTL checking enabled, up to 4 hops allowed
.
.
.

The table below describes the significant fields shown in the displays.

Table 15. show ip ospf interface Field Descriptions
Field	Description
Ethernet	Status of the physical link and operational status of the protocol.
Process ID	OSPF process ID.
Area	OSPF area.
Cost	Administrative cost assigned to the interface.
State	Operational state of the interface.
Nbrs F/C	OSPF neighbor count.
Internet Address	Interface IP address, subnet mask, and area address.
Topology-MTID	MTR topology Multitopology Identifier (MTID). A number assigned so that the protocol can identify the topology associated with information that it sends to its peers.
Transmit Delay	Transmit delay in seconds, interface state, and device priority.
Designated Router	Designated router ID and respective interface IP address.
Backup Designated router	Backup designated router ID and respective interface IP address.
Timer intervals configured	Configuration of timer intervals.
Hello	Number of seconds until the next hello packet is sent out this interface.
Strict TTL checking enabled	Only one hop is allowed.
Strict TTL checking enabled, up to 4 hops allowed	A set number of hops has been explicitly configured.
Neighbor Count	Count of network neighbors and list of adjacent neighbors.

show ip ospf max-metric

To display IP Open Shortest Path First (OSPF) max-metric origination information, use the show ip ospf max-metric command in user EXEC or privileged EXEC mode.

show ip ospf max-metric [multicast topology | topology] [topology-name | base]

Syntax Description


multicast	(Optional) Specifies the multicast topology.
topology	(Optional) Specifies the unicast or the multicast topology.
`topology-name`	(Optional) The multicast topology name.
base	(Optional) Specifies the multicast or unicast base topology.

Command Modes

User EXEC (>) Privileged EXEC (#)

Command History


Mainline Release	Modification
12.4(24)T	This command was introduced in a release earlier than Cisco IOS Release 12.4(24)T.
12.2(33)SXI	This command was integrated into a release earlier than Cisco IOS Release 12.2(33)SXI.
12.2(33)SRE	This command was integrated into a release earlier than Cisco IOS Release 12.4(24)T.
Cisco IOS XE 2.1	This command was integrated into Cisco IOS XE Release 2.1.

Examples

The following is sample output from the show ip ospf max-metric command. The fields are self-explanatory.


Router# show ip ospf
 max-metric
OSPF Router with ID (190.0.30.1) (Process ID 2) 
Base Topology (MTID 0)Start time: 3d12h, Time elapsed: 00:01:07.964
Originating router-LSAs with maximum metric
Condition: always, State: active
Advertise external-LSAs with metric 16711680

show ip ospf multi–area

To display interface information about Open Shortest Path First (OSPF) multiarea adjacency, use the show ip ospf multi-area command in user EXEC or privileged EXEC mode.

show ip ospf process-id multi-area

Syntax Description


`process-id`	Identifies the OSPF process. The range is from 1 to 65535.

Command Default

No default behavior or values.

Command Modes

User EXEC (>)

Privileged EXEC (#)

Command History


Release	Modification
Cisco IOS Release XE 3.10S	This command was introduced.

Examples

The following example shows sample output from the show ip ospf multi-area command:

Device# show ip ospf 1 multi-area

OSPF_MA1 is up, line protocol is up
  Primary Interface Ethernet0/0, Area 2
  Interface ID 2
  MTU is 1500 bytes
  Neighbor Count is 1

The table below describes the significant fields in the output.

Table 16. show ip ospf multi-area Field Descriptions
Field	Description
OSPF_MA1	Status of the OSPF multiarea interface.
Ethernet	Status of the physical link and operational status of the protocol.
Area	OSPF area.
MTU	The largest size of packets that the OSPF interface can transmit without the need to fragment.
Neighbor Count	Count of network neighbors and if applicable, a list of adjacent neighbors.

Related Commands


Command	Description
ip ospf multi-area	Enables multiarea adjacency on the OSPF interface.
ip ospf multi-area cost	Specifies the cost of sending a packet on an OSPF multiarea interface.
show ip ospf interface	Displays the interface information related to OSPF.

show ip ospf neighbor

To display Open Shortest Path First (OSPF) neighbor information on a per-interface basis, use the showipospfneighbor command in privileged EXEC mode.

show ip ospf neighbor [interface-type interface-number] [neighbor-id] [detail] [fast-reroute] [ summary [ per-instance] ]

Syntax Description


`interface-type` `interface-number`	(Optional) Type and number associated with a specific OSPF interface.
`neighbor-id`	(Optional) Neighbor hostname or IP address in A.B.C.D format.
detail	(Optional) Displays all neighbors given in detail (lists all neighbors).
fast-reroute	(Optional) Displays per-neighbor border router tables and SPF statistics.
summary	(Optional) Displays total number summary of all neighbors.
per-instance	(Optional) Displays total number of neighbors in each neighbor state. The output is printed for each configured OSPF instance separately.

Command Modes

Privileged EXEC (#)

Command History


Release	Modification
10.0	This command was introduced.
12.2(28)SB	This command was integrated into Cisco IOS Release 12.2(28)SB.
12.2(33)SRA	This command was integrated into Cisco IOS Release 12.2(33)SRA.
12.2SX	This command is supported in the Cisco IOS Release 12.2SX train. Support in a specific 12.2SX release of this train depends on your feature set, platform, and platform hardware.
12.2(33)SRC	Support for the OSPF TTL Security Check feature was added.
15.0(1)M	This command was integrated into Cisco IOS Release 15.0(1)M.
15.1(3)S	This command was modified. The fast-reroute was keyword were added.
15.1(1)SY	This command was modified. The summary and per-instance keywords were added.
15.3(1)S	This command was modified.The summary and per-instance keywords were added.
Cisco IOS XE Release 3.8S	This command was modified. The summary and per-instance keywords were added. .

Examples

The following sample output from the show ip ospf neighbor command shows a single line of summary information for each neighbor:


Device# show ip ospf neighbor

Neighbor ID 		Pri   State        Dead Time     Address         Interface
10.199.199.137  1    FULL/DR       0:00:31    192.168.80.37      Ethernet0
172.16.48.1     1    FULL/DROTHER  0:00:33    172.16.48.1        Fddi0
172.16.48.200   1    FULL/DROTHER  0:00:33    172.16.48.200      Fddi0
10.199.199.137  5    FULL/DR       0:00:33    172.16.48.189      Fddi0

The following is sample output showing summary information about the neighbor that matches the neighbor ID:


Device# show ip ospf neighbor 10.199.199.137
 
Neighbor 10.199.199.137, interface address 192.168.80.37
    In the area 0.0.0.0 via interface Ethernet0
    Neighbor priority is 1, State is FULL
    Options 2
    Dead timer due in 0:00:32
    Link State retransmission due in 0:00:04
 Neighbor 10.199.199.137, interface address 172.16.48.189
    In the area 0.0.0.0 via interface Fddi0
    Neighbor priority is 5, State is FULL
    Options 2
    Dead timer due in 0:00:32
    Link State retransmission due in 0:00:03

If you specify the interface along with the neighbor ID, the system displays the neighbors that match the neighbor ID on the interface, as in the following sample display:


Device# show ip ospf neighbor ethernet 0 10.199.199.137
 
Neighbor 10.199.199.137, interface address 192.168.80.37
    In the area 0.0.0.0 via interface Ethernet0
    Neighbor priority is 1, State is FULL
    Options 2
    Dead timer due in 0:00:37
    Link State retransmission due in 0:00:04

You can also specify the interface without the neighbor ID to show all neighbors on the specified interface, as in the following sample display:


Device# show ip ospf neighbor fddi 0

   ID          Pri   State        Dead Time     Address         Interface
172.16.48.1     1    FULL/DROTHER  0:00:33    172.16.48.1       Fddi0
172.16.48.200   1    FULL/DROTHER  0:00:32    172.16.48.200     Fddi0
10.199.199.137  5    FULL/DR       0:00:32    172.16.48.189     Fddi0

The following is sample output from the show ip ospf neighbor detail command:


Device# show ip ospf neighbor detail
 
Neighbor 192.168.5.2, interface address 10.225.200.28
    In the area 0 via interface GigabitEthernet1/0/0
    Neighbor priority is 1, State is FULL, 6 state changes
    DR is 10.225.200.28 BDR is 10.225.200.30
    Options is 0x42
    LLS Options is 0x1 (LR), last OOB-Resync 00:03:08 ago
    Dead timer due in 00:00:36
    Neighbor is up for 00:09:46
   Index 1/1, retransmission queue length 0, number of retransmission 1
    First 0x0(0)/0x0(0) Next 0x0(0)/0x0(0)
    Last retransmission scan length is 1, maximum is 1
    Last retransmission scan time is 0 msec, maximum is 0 msec

The table below describes the significant fields shown in the displays.

Table 17. show ip ospf neighbor detail Field Descriptions
Field	Description
Neighbor	Neighbor router ID.
interface address	IP address of the interface.
In the area	Area and interface through which the OSPF neighbor is known.
Neighbor priority	Router priority of the neighbor and neighbor state.
State	OSPF state. If one OSPF neighbor has enabled TTL security, the other side of the connection will show the neighbor in the INIT state.
state changes	Number of state changes since the neighbor was created. This value can be reset using the clearipospfcountersneighbor command.
DR is	Router ID of the designated router for the interface.
BDR is	Router ID of the backup designated router for the interface.
Options	Hello packet options field contents. (E-bit only. Possible values are 0 and 2; 2 indicates area is not a stub; 0 indicates area is a stub.)
LLS Options..., last OOB-Resync	Link-Local Signaling and out-of-band (OOB) link-state database resynchronization performed hours:minutes:seconds ago. This is nonstop forwarding (NSF) information. The field indicates the last successful out-of-band resynchronization with the NSF-capable router.
Dead timer due in	Expected time in hours:minutes:seconds before Cisco IOS software will declare the neighbor dead.
Neighbor is up for	Number of hours:minutes:seconds since the neighbor went into the two-way state.
Index	Neighbor location in the area-wide and autonomous system-wide retransmission queue.
retransmission queue length	Number of elements in the retransmission queue.
number of retransmission	Number of times update packets have been re-sent during flooding.
First	Memory location of the flooding details.
Next	Memory location of the flooding details.
Last retransmission scan length	Number of link state advertisements (LSAs) in the last retransmission packet.
maximum	Maximum number of LSAs sent in any retransmission packet.
Last retransmission scan time	Time taken to build the last retransmission packet.
maximum	Maximum time, in milliseconds, taken to build any retransmission packet.

Examples

The following is sample output from the show ip ospf neighbor command showing a single line of summary information for each neighbor. If one OSPF neighbor has enabled TTL security, the other side of the connection will show the neighbor in the INIT state.


Device# show ip ospf neighbor

Neighbor ID 			Pri   State        Dead Time     Address         Interface
10.199.199.137  1    FULL/DR       0:00:31    192.168.80.37      Ethernet0
172.16.48.1     1    FULL/DROTHER  0:00:33    172.16.48.1        Fddi0
172.16.48.200   1    FULL/DROTHER  0:00:33    172.16.48.200      Fddi0
10.199.199.137  5    FULL/DR       0:00:33    172.16.48.189      Fddi0
172.16.1.201		1	INIT/DROTHER			00.00.35		10.1.1.201			Ethernet0/0

The following sample output from the show ip ospf neighbor command shows the network from the neighbor’s point of view:


Device# show ip ospf neighbor 192.0.2.1 fast-reroute
            OSPF Router with ID (192.1.1.1) (Process ID 1)

                     Area with ID (0)

Neighbor with Router ID 192.0.2.1:
  Reachable over:
    Ethernet0/0, IP address 192.0.2.1, cost 10

  SPF was executed 1 times, distance to computing router 10

  Router distance table:
           192.1.1.1   i  [10]
           192.0.2.1   i  [0]
           192.3.3.3   i  [10]
           192.4.4.4   i  [20]
           192.5.5.5   i  [20]

  Network LSA distance table:
      192.2.12.2   i  [10]
      192.2.13.3   i  [20]
      192.2.14.4   i  [20]
      192.2.15.5   i  [20]

The following is sample output from the show ip ospf neighbor summary command:


Device# show ip ospf neighbor summary

    Neighbor summary for all OSPF processes

DOWN         0
ATTEMPT      0
INIT         0
2WAY         0
EXSTART      0
EXCHANGE     0
LOADING      0
FULL         1
Total count  1    (Undergoing NSF 0)

The following is sample output from the show ip ospf neighbor summary per-instance command:


Device# show ip ospf neighbor summary

      OSPF Router with ID (1.0.0.10) (Process ID 1)

DOWN         0
ATTEMPT      0
INIT         0
2WAY         0
EXSTART      0
EXCHANGE     0
LOADING      0
FULL         1
Total count  1    (Undergoing NSF 0)


             Neighbor summary for all OSPF processes

DOWN         0
ATTEMPT      0
INIT         0
2WAY         0
EXSTART      0
EXCHANGE     0
LOADING      0
FULL         1
Total count  1    (Undergoing NSF 0)

Table 18. show ip ospf neighbor summary and show ip ospf neighbor summary per-instance Field Descriptions
Field	Description
DOWN	No information (hellos) has been received from this neighbor, but hello packets can still be sent to the neighbor in this state.
ATTEMPT	This state is only valid for manually configured neighbors in a Non-Broadcast Multi-Access (NBMA) environment. In Attempt state, the router sends unicast hello packets every poll interval to the neighbor, from which hellos have not been received within the dead interval.
INIT	This state specifies that the router has received a hello packet from its neighbor, but the receiving router's ID was not included in the hello packet. When a router receives a hello packet from a neighbor, it should list the sender's router ID in its hello packet as an acknowledgment that it received a valid hello packet.
2WAY	This state designates that bi-directional communication has been established between two routers.
EXSTART	This state is the first step in creating an adjacency between the two neighboring routers. The goal of this step is to decide which router is the primary, and to decide upon the initial DD sequence number. Neighbor conversations in this state or greater are called adjacencies.
EXCHANGE	In this state, OSPF routers exchange database descriptor (DBD) packets. Database descriptors contain link-state advertisement (LSA) headers only and describe the contents of the entire link-state database. Each DBD packet has a sequence number which can be incremented only by primary which is explicitly acknowledged by subordinate. Routers also send link-state request packets and link-state update packets (which contain the entire LSA) in this state. The contents of the DBD received are compared to the information contained in the routers link-state database to check if new or more current link-state information is available with the neighbor.
LOADING	In this state, the actual exchange of link state information occurs. Based on the information provided by the DBDs, routers send link-state request packets. The neighbor then provides the requested link-state information in link-state update packets. During the adjacency, if a device receives an outdated or missing LSA, it requests that LSA by sending a link-state request packet. All link-state update packets are acknowledged.
FULL	In this state, devices are fully adjacent with each other. All the device and network LSAs are exchanged and the devices' databases are fully synchronized. Full is the normal state for an OSPF device. If a device is stuck in another state, it's an indication that there are problems in forming adjacencies. The only exception to this is the 2-way state, which is normal in a broadcast network. Devices achieve the full state with their DR and BDR only. Neighbors always see each other as 2-way.

show ip ospf nsf

To display IP Open Shortest Path First (OSPF) nonstop forwarding (NSF) state information, use the show ip ospf nsf command in user EXEC or privileged EXEC mode.

show ip ospf nsf

Syntax Description

This command has no arguments or keywords.

Command Modes

User EXEC (>) Privileged EXEC (#)

Command History


Mainline Release	Modification
12.2(33)SXI	This command was introduced in a release earlier than Cisco IOS Release 12.2(33)SXI.
12.2(33)SRE	This command was integrated into Cisco IOS Release 12.2(33)SRE.

Examples

The following is sample output from the show ip ospf nsf command. The fields are self-explanatory.


Router# show ip ospf
 nsf
Routing Process "ospf 2" 
 Non-Stop Forwarding enabled
 IETF NSF helper support enabled
 Cisco NSF helper support enabled 
 OSPF restart state is NO_RESTART
Handle 1786466308, Router ID 192.0.2.1, checkpoint Router ID 0.0.0.0
Config wait timer interval 10, timer not running
Dbase wait timer interval 120, timer not running

show ip ospf nsr

To display IP Open Shortest Path First (OSPF) nonstop routing (NSR) status information, use the show ip ospf nsr command in privileged EXEC mode.

show ip ospf [process-id] nsr [ [objects] | [statistics]]

Syntax Description


`process-id`	(Optional) Process ID. If this argument is used, only information for the specified OSPF routing process is included.
objects	(Optional) Displays information on the OSPF NSR objects in the different OSPF routing processes.
statistics	(Optional) Displays OSPF NSR statistical information for the different OSPF routing processes.

Command Modes

Privileged EXEC (#)

Command History


Release	Modification
15.1(2)S	This command was introduced.
Cisco IOS XE Release 3.3S	This command was integrated into Cisco IOS XE Release 3.3S.
15.2(1) E	This command was integrated into 15.2(1) E.

Examples

The following sample output from the show ip ospf nsr command shows that OSPF on the standby RP is fully synchronized and ready to continue operation if the active RP fails or if a manual switchover is performed. NSR is configured and enabled for the “ospf 1” OSPF routing process. The fields are self-explanatory.


Router# show ip ospf
 1 nsr
Active RP  
Operating in duplex mode  
Redundancy state: ACTIVE  
Peer redundancy state: STANDBY HOT  
Checkpoint peer ready  
Checkpoint messages enabled  
ISSU negotiation complete  
ISSU versions compatible   
Routing Process "ospf 1" with ID 10.1.1.100  
NSR configured  
Checkpoint message sequence number: 6360  
Standby synchronization state: synchronized
Bulk sync operations:  1  
Next sync check time:  18:48:27.097 PST Fri Dec 10 2010  
LSA Count: 3301, Checksum Sum 0x06750217

Related Commands


Command	Description
nsr	Enables NSR on a router that is running OSPF.

show ip ospf request-list

To display a list of all link-state advertisements (LSAs) requested by a router, use the showipospfrequest-list command in EXEC mode.

show ip ospf request-list [neighbor] [interface] [interface-neighbor]

Syntax Description


`neighbor`	(Optional) Displays the list of all LSAs requested by the router from this neighbor.
`interface`	(Optional) Displays the list of all LSAs requested by the router from this interface.
`interface-neighbor`	(Optional) Displays the list of all LSAs requested by the router on this interface from this neighbor.

Command Modes

EXEC

Command History


Release	Modification
10.2	This command was introduced.
12.2(33)SRA	This command was integrated into Cisco IOS Release 12.2(33)SRA.
12.2SX	This command is supported in the Cisco IOS Release 12.2SX train. Support in a specific 12.2SX release of this train depends on your feature set, platform, and platform hardware.

Usage Guidelines

The information displayed by the showipospfrequest-list command is useful in debugging Open Shortest Path First (OSPF) routing operations.

Examples

The following is sample output from the showipospfrequest-list command:


Router# show ip ospf request-list serial 0
 
             OSPF Router with ID (192.168.1.11) (Process ID 1)
 
  Neighbor 192.168.1.12, interface Serial0 address 172.16.1.12
 
  Type  LS ID           ADV RTR         Seq NO      Age    Checksum
     1  192.168.1.12      192.168.1.12      0x8000020D  8      0x6572

The table below describes the significant fields shown in the displays.

Table 19. show ip ospf request-list Field Descriptions
Field	Description
Type	LSA-type.
LS ID	IP address of the neighbor router.
ADV RTR	IP address of the advertising router.
Seq NO	Packet sequence number of the LSA.
Age	Age, in seconds, of the LSA.
Checksum	Checksum number of the LSA.

show ip ospf retransmission-list

To display a list of all link-state advertisements (LSAs) waiting to be re-sent, use the showipospfretransmission-list command in EXEC mode.

show ip ospf retransmission-list [neighbor] [interface] [interface-neighbor]

Syntax Description


`neighbor`	(Optional) Displays the list of all LSAs waiting to be re-sent for this neighbor.
`interface`	(Optional) Displays the list of all LSAs waiting to be re-sent on this interface.
`interface` `neighbor`	(Optional) Displays the list of all LSAs waiting to be re-sent on this interface, from this neighbor.

Command Modes

EXEC

Command History


Release	Modification
10.2	This command was introduced.
12.2(33)SRA	This command was integrated into Cisco IOS Release 12.2(33)SRA.
12.2SX	This command is supported in the Cisco IOS Release 12.2SX train. Support in a specific 12.2SX release of this train depends on your feature set, platform, and platform hardware.

Usage Guidelines

The information displayed by the showipospfretransmission-list command is useful in debugging Open Shortest Path First (OSPF) routing operations.

Examples

The following is sample output from the showipospfretransmission-list command:


Router# show ip ospf retransmission-list serial 0
 
             OSPF Router with ID (192.168.1.12) (Process ID 1)
 
  Neighbor 192.168.1.11, interface Serial0 address 172.16.1.11
  Link state retransmission due in 3764 msec, Queue length 2
 
  Type  LS ID             ADV RTR           Seq NO      Age    Checksum
     1  192.168.1.12      192.168.1.12      0x80000210  0      0xB196

The table below describes the significant fields shown in the displays.

Table 20. show ip ospf retransmission-list Field Descriptions
Field	Description
Type	LSA-type.
LS ID	IP address of the neighbor router.
ADV RTR	IP address of the advertising router.
Seq NO	Packet sequence number of the LSA.
Age	Age, in seconds, of the LSA.
Checksum	Checksum number of the LSA.

show ip ospf rib

To display information for the Open Shortest Path First (OSPF) local Routing Information Base (RIB) or locally redistributed routes, use the showipospfrib command in privileged EXEC mode.

show ip ospf process-id rib [redistribution] [network-prefix] [network-mask] [detail]

Syntax Description


`process-id`	Internally used identification parameter for an OSPF routing process. It is locally assigned and can be any positive integer. A unique value is assigned for each OSPF routing process.
redistribution	(Optional) Displays IP OSPF redistribution RIB information.
`network-prefix`	(Optional) Network prefix. Displays paths for a specific route.
`network-mask`	(Optional) IP address mask. Displays paths for all routes under a major network.
detail	(Optional) Displays more detailed information about the OSPF local RIB.

Command Modes

Privileged EXEC (#)

Command History


Release	Modification
12.4(15)T	This command was introduced.
12.2(33)SRC	This command was integrated into Cisco IOS Release 12.2(33)SRC.
12.2(33)SB	This command was integrated into Cisco IOS Release 12.2(33)SB.
15.1(3)S	This command was modified. Output was enhanced to display both primary paths and any loop-free alternate (LFA) and Fast Reroute (FRR) repair paths protecting them.
15.2(2)SNI	This command was implemented on the Cisco ASR 901 Series Aggregation Services Routers.

Usage Guidelines

If the network-prefix and network-mask arguments are both entered, only the route that matches the network prefix and IP address mask is displayed. If only the network-prefix argument is entered, a longest prefix lookup is performed and the matching route is displayed.

Examples

The following example displays information about locally redistributed routes:


Router# show ip ospf 1 rib redistribution 192.168.240.0
OSPF Redistribution for Process 1
192.168.240/20, metric 0, tag 0, from OSPF Router 130
 Attributes 0x1000220, event 1
  via Ethernet0/0
OSPF Redistribution Process 130

The table below describes the significant fields shown in the display.

Table 21. show ip ospf rib redistribution F ield Descriptions
Field	Description
OSPF Redistribution for Process 1	Routing redistribution information for OSPF process 1.
192.168.240/20	Network number and mask.
metric 0	OSPF metric type.
tag 0	OSPF process tag identifier.
from OSPF Router	OSPF router from which routing information was redistributed.
Attributes 0x1000220	OSPF attribute.
event	OSPF redistribution event 1.
Via Ethernet0/0	The interface through which routing information has been redistributed.
OSPF Redistribution Process	Routing redistribution information for OSPF process 13.

The following example displays information about primary paths and the LFA and FRR repair paths protecting them:


Router# show ip ospf 1 rib
OSPF Router with ID (192.1.1.1) (Process ID 1)
                 Base Topology (MTID 0)
OSPF local RIB
Codes: * - Best, > - Installed in global RIB

*   192.168.15.0/24, Intra, cost 10, area 0, Connected
       via 192.168.15.1, Ethernet0/3
*>  192.168.23.0/24, Intra, cost 20, area 0
       via 192.168.12.2, Ethernet0/0
       repair path via 192.168.13.3, Ethernet0/1, cost 20
       via 192.168.13.3, Ethernet0/1
       repair path via 192.168.12.2, Ethernet0/0, cost 20
*>  192.168.26.0/24, Intra, cost 20, area 0
       via 192.168.12.2, Ethernet0/0
       repair path via 192.168.13.3, Ethernet0/1, cost 30
*>  192.168.46.0/24, Intra, cost 30, area 0
       via 192.168.12.2, Ethernet0/0
       repair path via 192.168.13.3, Ethernet0/1, cost 40

Related Commands


Command	Description
debug ip ospf rib	Displays debugging information for OSPF Version 2 routes in the global or local RIB.
show ip ospf fast-reroute	Displays information about prefixes protected by LFA FRR repair paths.
show ip ospf interface	Displays OSPF interface information.
show ip ospf neighbor	Displays OSPF neighbor information on a per-interface basis.

show ip ospf sham-links

To display information about all sham-links configured for a provider edge (PE) router in the Virtual Private Network (VPN) backbone, use the show ip ospf sham-links command in EXEC mode.

show ip ospf sham-links

Syntax Description

This command has no arguments or keywords.

Command Default

No default behavior or values.

Command Modes

EXEC

Command History


Release	Modification
12.2(8)T	This command was introduced.
12.0(21)ST	This command was integrated into Cisco IOS Release 12.0(21)ST, and support for Cisco 12000 series Internet Router was added.
12.0(22)S	This command was integrated into Cisco IOS Release 12.0(22)S, and support for Cisco 10000 series Internet Routers was added.
12.2(33)SRA	This command was integrated into Cisco IOS Release 12.2(33)SRA.
12.2SX	This command is supported in the Cisco IOS Release 12.2SX train. Support in a specific 12.2SX release of this train depends on your feature set, platform, and platform hardware.

Usage Guidelines

Use this command to display Open Shortest Path First (OSPF) information about the sham-links configured on a PE router.

Examples

The following example shows sample output from the show ip ospf sham-links command for a PE router in the VPN backbone:


Router1# show ip ospf sham-links
Sham Link OSPF_SL0 to address 10.44.0.1 is up
 Area 120 source address 10.0.0.1
   Run as demand circuit
   DoNotAge LSA allowed., Cost of using 1
   Transmit Delay is 1 sec, State POINT_TO_POINT,
   Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
     Hello due in 00:00:09
     Adjacency State FULL (Hello suppressed)
     Index 2/2, retransmission queue length 0, number of retransmission 27
     First 0x0(0)/0x0(0) Next 0x0(0)/0x0(0)
     Last retransmission scan length is 0, maximum is 2
     Last retransmission scan time is 0 msec, maximum is 0 msec

show ip ospf statistics

To display Open Shortest Path First (OSPF) shortest path first (SPF) calculation statistics, use the showipospfstatistics command in user EXEC or privileged EXEC mode.

show ip ospf statistics [detail]

Syntax Description


detail	(Optional) Displays statistics separately for each OSPF area and includes additional, more detailed statistics.

Command Modes

User EXEC Privileged EXEC

Command History


Release	Modification
12.0(24)S	This command was introduced.
12.2(18)S	The command was integrated into Cisco IOS Release 12.2(18)S.
12.3(2)T	The command was integrated into Cisco IOS Release 12.3(2)T.

Usage Guidelines

The showipospfstatistics command provides important information about SPF calculations and the events that trigger them. This information can be meaningful for both OSPF network maintenance and troubleshooting. For example, entering the showipospfstatistics command is recommended as the first troubleshooting step for link-state advertisement (LSA) flapping.

Examples

The following is sample output from the showipospfstatistics command that shows a single line of information for each SPF calculation:


Router# show ip ospf statistics 
OSPF process ID 200
------------------------------------------
  Area 0: SPF algorithm executed 10 times
  Area 200: SPF algorithm executed 8 times
  Summary OSPF SPF statistic
  SPF calculation time
Delta T    Intra   D-Intra   Summ   D-Summ   Ext   D-Ext   Total   Reason
08:17:16   0       0         0      0       0      0       0       R, 
08:16:47   0       0         0      0       0      0       0       R, N, 
08:16:37   0       0         0      0       0      0       0       R, X
00:04:40   208     40        208    44      220    0       720     R, N, SN, X
00:03:15   0       112       4      108     8      96      328     R, N, SN, X
00:02:55   164     40        176    44      188    0       612     R, N, SN, X
00:01:49   0       4         4      0       4      4       16      R, N, SN, X
00:01:48   0       0         4      0       4      0       12      R, N, SN, SA, X
00:01:43   0       0         4      0       4      0       8       R, 
00:00:53   164     40        176    44      188    0       612     R, N, SN, X

The table below describes the significant fields shown in the display.

Table 22. show ip ospf statistics F ield Descriptions
Field	Description
OSPF process ID	A unique value assigned to the OSPF process in the configuration.
Area	OSPF area ID.
SPF algorithm executed	Number of times SPF algorithm has been executed for the particular area.
Delta T	Amount of time in milliseconds that has passed from when SPF started its calculation to the current time.
Intra	Time in milliseconds for the SPF algorithm to process intra-area LSAs and install intra-area routes in the routing table.
D-Intra	Time in milliseconds for the SPF algorithm to delete invalid intra-area routes from the routing table.
Summ	Time in milliseconds for the SPF algorithm to process interarea LSAs and install interarea routes in the routing table.
D-Summ	Time in milliseconds for the SPF algorithm to delete invalid interarea routes from the routing table.
Ext	Time in milliseconds for the SPF algorithm to process external and not so stubby area (NSSA) LSAs and install external and NSSA routes in the routing table.
D-Ext	Time in milliseconds for the SPF algorithm to delete invalid external and NSSA routes from the routing table.
Total	Total duration time, in milliseconds, for the SPF algorithm process.
Reason	Record of reasons causing SPF to be executed: N--A change in a network LSA (type 2) has occurred. R--A change in a router LSA (type 1) has occurred. SA--A change in a Summary autonomous system boundary router (ASBR) (SA) LSA has occurred. SN--A change in a Summary Network (SN) LSA has occurred. X--A change in an External Type-7 (X7) LSA has occurred.

The following is sample output from the showipospfstatistics command with the detail keyword entered to show the statistics separately for a specific area:


Router# show ip ospf statistics detail
SPF 7 executed 2d17h ago, SPF type Full
  SPF calculation time (in msec):
  SPT   Intra   D-Intr   Summ   D-Summ   Ext7   D-Ext7   Total
  0     0       0        0      0        0      0        0
  LSIDs processed R:4 N:1 Stub:5 SN:17 SA:1 X7:0
  Change record R, 
  LSIDs changed 1
  Last 10 LSIDs:
2.0.0.202(R)

The table below describes the significant fields shown in the display.

Table 23. show ip ospf statistics detail F ield Descriptions

Field

Description

SPF

Number of SPF algorithms executed in the OSPF area. The number increases by one for each SPF algorithm that is executed in the area.

Executed ago

Time in milliseconds that has passed between the start of the SPF algorithm execution and the current time.

SPF type

SPF type can be Full or Incremental.

SPT

Time in milliseconds requires to compute the first stage of the SPF algorithm (to build a short path tree). The SPT time plus the time required to process links to stub networks equals the Intra time.

Ext

Time in milliseconds for the SPF algorithm to process external and not so stubby area (NSSA) link-state advertisements (LSAs) and install external and NSSA routes in the routing table.

Total

Total duration time, in milliseconds, for the SPF algorithm process.

Note

Total time is the sum of previous times excluding the SPT time, which is already included in the Intra time.

LSIDs processed

Number of LSAs processed during the SPF calculation:

N--Network LSA.
R--Router LSA.
SA--Summary autonomous system boundary router (ASBR) (SA) LSA.
SN--Summary Network (SN) LSA.
Stub--Stub links.
X7--External Type-7 (X7) LSA.

LSIDs changed

Number of LSAs changed between this SPF calculation and the previous one. LSA changes force SPF to be scheduled.

Last 10 LSIDs

List of last ten Intra area LSAs that have changed between this SPF calculation and the previous one. LSID types:

R--Router LSA (type 1)
N--Network LSA (type 2)

show ip ospf summary-address

To display a list of all summary address redistribution information configured under an Open Shortest Path First (OSPF) process, use the showipospfsummary-address command in EXEC mode.

show ip ospf [process-id] summary-address

Syntax Description


`process-id`	(Optional) OSPF area ID.

Command Modes

EXEC

Command History


Release	Modification
10.0	This command was introduced.
12.2(33)SRA	This command was integrated into Cisco IOS Release 12.2(33)SRA.
12.2SX	This command is supported in the Cisco IOS Release 12.2SX train. Support in a specific 12.2SX release of this train depends on your feature set, platform, and platform hardware.

Usage Guidelines

The process-id argument can be entered as a decimal number or as an IP address format.

Examples

The following is sample output from the showipospfsummary-address command:


Router# show ip ospf summary-address
 
OSPF Process 2, Summary-address
10.2.0.0/255.255.0.0 Metric -1, Type 0, Tag 0
10.2.0.0/255.255.0.0 Metric -1, Type 0, Tag 10

The table below describes the significant fields shown in the displays.

Table 24. show ip ospf request-list Field Descriptions
Field	Description
10.2.0.0/255.255.0.0	IP address and mask of the router for the OSPF process.
Metric -1	OSPF metric type.
Type 0	Type indicates the external type (type 1 or type 2) that is a component of the summary. 0 indicates that neither type 1 or type 2 external routes include the component.
Tag 0	OSPF process tag identifier.

show ip ospf timers rate-limit

To display all of the link-state advertisements (LSAs) in the rate limit queue, use the showipospftimersrate-limit command in privileged EXEC mode.

show ip ospf timers rate-limit

Syntax Description

This command has no arguments or keywords.

Command Modes

Privileged EXEC

Command History


Release	Modification
12.0(25)S	This command was introduced.
12.2(27)SBC	This command was integrated into Cisco IOS Release 12.2(27)SBC.
12.2(33)SRA	This command was integrated into Cisco IOS Release 12.2(33)SRA.
12.2SX	This command is supported in the Cisco IOS Release 12.2SX train. Support in a specific 12.2SX release of this train depends on your feature set, platform, and platform hardware.

Usage Guidelines

Use this command if you need to see when LSAs in the queue will be sent.

Examples

The following is sample output from the showipospftimersrate-limit command:


Router# show ip ospf timers rate-limit
LSAID: 10.1.1.1    Type: 1   Adv Rtr: 172.16.2.2 Due in: 00:00:00.028
LSAID: 172.16.4.1   Type: 3   Adv Rtr: 172.16.2.2 Due in: 00:00:00.028

The table below describes the significant fields shown in the display.

Table 25. show ip ospf timers rate-limit Field Descriptions
Field	Description
LSAID	ID of the LSA.
Type	Type of LSA.
Adv Rtr	ID of advertising router.
Due in	When the LSA is scheduled to be sent (in hours:minutes:seconds).

show ip ospf traffic

To display Open Shortest Path First (OSPF) traffic statistics, use the showipospftraffic command in user EXEC or privileged EXEC mode.

show ip ospf [process-id] traffic [interface-type interface-number]

Syntax Description


`process-id`	(Optional) Process ID. If the `process-id` argument is included, only information for the specified routing process is displayed.
`interface-type` `interface-number`	(Optional) Type and number associated with a specific OSPF interface.

Command Default

When the showipospftraffic command is entered without any arguments, global OSPF traffic statistics are displayed, including queue statistics for each OSPF process, statistics for each interface, and per-OSPF process statistics.

Command Modes

User EXEC (>) Privileged EXEC (#)

Command History


Release	Modification
12.3(11)T	This command was introduced.
12.0(28)S	This command was integrated into Cisco IOS Release 12.0(28)S.
12.4(6)T	Support for the OSPF Enhanced Traffic Statistics for OSPFv2 and OSPFv3 feature was added.
12.2(31)SB2	This command was integrated into Cisco IOS Release 12.2(31)SB2.
12.2(33)SRB	This command was integrated into Cisco IOS Release 12.2(33)SRB.
12.2(33)SRC	Support for the OSPF TTL Security Check feature was added.
15.0(1)M	This command was integrated into Cisco IOS Release 15.0(1)M.

Usage Guidelines

You can limit the displayed traffic statistics to those for a specific OSPF process by entering a value for the process-id argument, or you can limit output to traffic statistics for a specific interface associated with an OSPF process by entering values for the interface-type and interface-number arguments. To reset counters and clear statistics, use the clearipospftraffic command.

Examples

The following is sample output from the show ip ospf traffic command.


Router# show ip ospf traffic
OSPF statistics:
  Rcvd: 5300 total, 730 checksum errors
        333 hello, 10 database desc, 3 link state req
        24 link state updates, 13 link state acks
  Sent: 264 total
        222 hello, 12 database desc, 3 link state req
        17 link state updates, 12 link state acks
           OSPF Router with ID (10.0.1.2) (Process ID 100)
OSPF queues statistic for process ID 100:
  OSPF Hello queue size 0, no limit, max size 3
  OSPF Router queue size 0, limit 200, drops 0, max size 3
Interface statistics:
    Interface Loopback0
OSPF packets received/sent
     Invalid  Hellos   DB-des   LS-req   LS-upd   LS-ack   Total
Rx:  0        0        0        0        0        0        0
Tx:  0        0        0        0        0        0        0
OSPF header errors
  Length 0, Checksum 0, Version 0, Bad Source 0, 
  No Virtual Link 0, Area Mismatch 0, No Sham Link 0, 
  Self Originated 0, Duplicate ID 0, LLS 0, 
  Authentication 0,
OSPF LSA errors
  Type 0, Length 0, Data 0, Checksum 0, 
     Interface Serial3/0
  OSPF packets received/sent
      Invalid  Hellos   DB-des   LS-req   LS-upd   LS-ack   Total
Rx:   0        111      3        1        7        6        128
Tx:   0        111      4        1        12       5        133
  OSPF header errors
    Length 0, Checksum 0, Version 0, Bad Source 0, 
    No Virtual Link 0, Area Mismatch 0, No Sham Link 0, 
    Self Originated 0, Duplicate ID 0, LLS 0, 
    Authentication 0, 
  OSPF LSA errors
    Type 0, Length 0, Data 0, Checksum 0, 
    Interface Serial2/0
  OSPF packets received/sent
      Invalid  Hellos   DB-des   LS-req   LS-upd   LS-ack   Total
Rx:   0        0        0        0        0        0        0
Tx:   0        0        0        0        0        0        0
  OSPF header errors
    Length 0, Checksum 0, Version 0, Bad Source 0, 
    No Virtual Link 0, Area Mismatch 0, No Sham Link 0, 
    Self Originated 0, Duplicate ID 0, LLS 0, 
    Authentication 0, 
OSPF LSA errors
  Type 0, Length 0, Data 0, Checksum 0, 
  Interface Ethernet0/0
  OSPF packets received/sent
       Invalid  Hellos   DB-des   LS-req   LS-upd   LS-ack   Total
Rx:    0        222      7        2        17       7        255
Tx:    0        111      8        2        5        7        133
OSPF header errors
  Length 0, Checksum 730, Version 800, Bad Source 0, 
  No Virtual Link 0, Area Mismatch 0, No Sham Link 0, 
  Self Originated 3387, Duplicate ID 0, LLS 0, 
  Authentication 0, 
OSPF LSA errors
  Type 0, Length 0, Data 0, Checksum 0, 
Summary traffic statistics for process ID 100:
  Rcvd: 5300 total, 4917 errors
        333 hello, 10 database desc, 3 link state req
        24 link state upds, 13 link state acks, 0 invalid
  Sent: 266 total
        222 hello, 12 database desc, 3 link state req
        17 link state upds, 12 link state acks, 0 invalid

The table below describes the significant fields shown in the display.

Table 26. show ip ospf traffic Field Descriptions

Field

Description

OSPF statistics

Traffic statistics accumulated for all OSPF processes running on the router. To ensure compatibility with the showiptraffic command, only checksum errors are displayed. Identifies the route map name.

OSPF queues statistic for process ID

Statistics specific to Cisco IOS software.

OSPF Hello queue

Statistics for the internal Cisco IOS queue between the packet switching code (process IP Input) and the OSPF hello process for all received OSPF packets.

OSPF Router queue

Statistics for the internal Cisco IOS queue between the OSPF hello process and the OSPF router for all received OSPF packets except OSPF hellos.

queue size

Actual size of the queue.

queue limit

Maximum allowed size of the queue.

queue max size

Maximum recorded size of the queue.

Interface statistics

Per-interface traffic statistics for all interfaces that belong to the specific OSPF process ID.

OSPF packets received/sent

Number of OSPF packets received and sent on the interface, sorted by packet types.

OSPF header errors

Packet appears in this section if it was discarded because of an error in the header of an OSPF packet. The discarded packet is counted under the appropriate discard reason. Number of packets dropped due to TTL security check is displayed if that feature has been configured.

OSPF LSA errors

Packet appears in this section if it was discarded because of an error in the header of an OSPF link-state advertisement (LSA). The discarded packet is counted under the appropriate discard reason.

Summary traffic statistics for process ID

Summary traffic statistics accumulated for an OSPF process.

Note

The OSPF process ID is a unique value assigned to the OSPF process in the configuration.

The value for the received errors is the sum of the OSPF header errors that are detected by the OSPF process, unlike the sum of the checksum errors that are listed in the global OSPF statistics.

Examples

The following is sample output from the show ip ospf traffic command. The output has been modified to include the number of packets dropped due a TTL security check.


Router# show ip ospf traffic
.
.
.
OSPF header errors
  Length 0, Checksum 0, Version 0, Bad Source 0, 
  No Virtual Link 0, Area Mismatch 0, No Sham Link 0, 
  Self Originated 0, Duplicate ID 0, LLS 0, 
  Authentication 0, TTL Check Fail 2,
.

Examples

The following is sample output from the showipospftraffic command that displays the detailed traffic information for OSPF packets received and sent on each OSPF interface and OSPF process.


Router# show ip ospf traffic 
OSPF statistics:
.
.
.
    Interface Ethernet0/0.1
OSPF packets received/sent
  Type          Packets              Bytes
  RX Invalid    0                    0
  RX Hello      0                    0
  RX DB des     0                    0
  RX LS req     0                    0
  RX LS upd     0                    0
  RX LS ack     0                    0
  RX Total      0                    0
  TX Failed     0                    0
  TX Hello      16                   1216
  TX DB des     0                    0
  TX LS req     0                    0
  TX LS upd     0                    0
  TX LS ack     0                    0
  TX Total      16                   1216
.
.
.
    Interface Serial2/0
OSPF packets received/sent
  Type          Packets              Bytes
  RX Invalid    0                    0
  RX Hello      11                   528
  RX DB des     4                    148
  RX LS req     1                    60
  RX LS upd     3                    216
  RX LS ack     2                    128
  RX Total      21                   1080
  TX Failed     0                    0
  TX Hello      14                   1104
  TX DB des     3                    252
  TX LS req     1                    56
  TX LS upd     3                    392
  TX LS ack     2                    128
  TX Total      23                   1932
.
.
.
    Interface Ethernet0/0
OSPF packets received/sent
  Type          Packets              Bytes
  RX Invalid    0                    0
  RX Hello      13                   620
  RX DB des     3                    116
  RX LS req     1                    36
  RX LS upd     3                    228
  RX LS ack     4                    216
  RX Total      24                   1216
  TX Failed     0                    0
  TX Hello      17                   1344
  TX DB des     4                    276
  TX LS req     1                    56
  TX LS upd     7                    656
  TX LS ack     2                    128
  TX Total      31                   2460
.
.
.
Summary traffic statistics for process ID 1:
OSPF packets received/sent
  Type          Packets              Bytes
  RX Invalid    0                    0
  RX Hello      24                   1148
  RX DB des     7                    264
  RX LS req     2                    96
  RX LS upd     6                    444
  RX LS ack     6                    344
  RX Total      45                   2296
  TX Failed     0                    0
  TX Hello      31                   2448
  TX DB des     7                    528
  TX LS req     2                    112
  TX LS upd     10                   1048
  TX LS ack     4                    256
  TX Total      54                   4392
OSPF header errors
  Length 0, Checksum 0, Version 0, Bad Source 13, 
  No Virtual Link 0, Area Mismatch 0, No Sham Link 0, 
  Self Originated 0, Duplicate ID 0, Hello 0, 
  MTU Mismatch 0, Nbr Ignored 0, LLS 0, 
  Authentication 0, 
OSPF LSA errors
  Type 0, Length 0, Data 0, Checksum 0,

To start collecting new statistics, reset the counters and clear the traffic statistics by entering the clearipospftraffic command as follows:


Router# clear ip ospf traffic

Related Commands


Command	Description
clear ip ospf traffic	Clears OSPFv2 traffic statistics.
clear ipv6 ospf traffic	Clears OSPFv3 traffics statistics.
show ipv6 ospf traffic	Displays OSPFv3 traffic statistics.

show ip ospf virtual-links

To display parameters and the current state of Open Shortest Path First (OSPF) virtual links, use the showipospfvirtual-links command in EXEC mode.

show ip ospf virtual-links

Syntax Description

This command has no arguments or keywords.

Command Modes

EXEC

Command History


Release	Modification
10.0	This command was introduced.
12.2(33)SRA	This command was integrated into Cisco IOS Release 12.2(33)SRA.
12.2SX	This command is supported in the Cisco IOS Release 12.2SX train. Support in a specific 12.2SX release of this train depends on your feature set, platform, and platform hardware.

Usage Guidelines

The information displayed by the showipospfvirtual-links command is useful in debugging OSPF routing operations.

Examples

The following is sample output from the showipospfvirtual-links command:


Router# show ip ospf virtual-links
Virtual Link to router 192.168.101.2 is up
Transit area 0.0.0.1, via interface Ethernet0, Cost of using 10
Transmit Delay is 1 sec, State POINT_TO_POINT
Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
Hello due in 0:00:08
Adjacency State FULL

The table below describes the significant fields shown in the display.

Table 27. show ip ospf virtual-links Field Descriptions
Field	Description
Virtual Link to router 192.168.101.2 is up	Specifies the OSPF neighbor, and if the link to that neighbor is up or down.
Transit area 0.0.0.1	The transit area through which the virtual link is formed.
via interface Ethernet0	The interface through which the virtual link is formed.
Cost of using 10	The cost of reaching the OSPF neighbor through the virtual link.
Transmit Delay is 1 sec	The transmit delay (in seconds) on the virtual link.
State POINT_TO_POINT	The state of the OSPF neighbor.
Timer intervals...	The various timer intervals configured for the link.
Hello due in 0:00:08	When the next hello is expected from the neighbor.
Adjacency State FULL	The adjacency state between the neighbors.

show ipv6 ospf

To display general information about Open Shortest Path First ( OSPF) routing processes, use the show ipv6 ospf command in user EXEC or privileged EXEC mode.

show ipv6 ospf [process-id] [area-id] [rate-limit]

Syntax Description


`process-id`	(Optional) Internal identification. It is locally assigned and can be any positive integer. The number used here is the number assigned administratively when the OSPF routing process is enabled.
`area-id`	(Optional) Area ID. This argument displays information about a specified area only.
rate-limit	(Optional) Rate-limited link-state advertisements (LSAs). This keyword displays LSAs that are currently being rate limited, together with the remaining time to the next generation.

Command Modes

User EXEC
Privileged EXEC

Command History


Release	Modification
12.0(24)S	This command was introduced.
12.2(15)T	This command was integrated into Cisco IOS Release 12.2(15)T.
12.2(18)S	This command was integrated into Cisco IOS Release 12.2(18)S.
12.3(4)T	Command output is changed when authentication is enabled.
12.2(28)SB	This command was integrated into Cisco IOS Release 12.2(28)SB.
12.2(25)SG	This command was integrated into Cisco IOS Release 12.2(25)SG.
12.2(33)SRA	This command was integrated into Cisco IOS Release 12.2(33)SRA.
12.4(9)T	Command output was updated to display OSPF for IPv6 encryption information.
12.4(15)XF	Command output was modified to include VMI PPPoE process-level values.
12.4(15)T	This command was integrated into Cisco IOS Release 12.4(15)T
12.2(33)SXH	This command was integrated into Cisco IOS Release 12.2(33)SXH.
12.2(33)SRC	The rate-limit keyword was added. Command output was modified to include the configuration values for SPF and LSA throttling timers.
12.2(33)SB	This command was integrated into Cisco IOS Release 12.2(33)SB.
Cisco IOS XE Release 2.1	This command was integrated into Cisco IOS XE Release 2.1.
15.0(1)M	This command was integrated into Cisco IOS Release 12.5(1)M.
15.1(2)T	This command was modified. Support for IPv6 was added to Cisco IOS Release 15.1(2)T.
12.2(50)SY	This command was integrated into Cisco IOS Release 12.2(50)SY.
15.1(1)SG	This command was integrated into Cisco IOS Release 15.1(1)SG.
15.0(1)SY	This command was integrated into Cisco IOS Release 15.0(1)SY.
15.2(2)SNG	This command was implemented on the Cisco ASR 901 Series Aggregation Services devices.

Examples

The following is sample output from the show ipv6 ospf command:


Device# show ipv6 ospf
Routing Process "ospfv3 1" with ID 10.10.10.1
 SPF schedule delay 5 secs, Hold time between two SPFs 10 secs
 Minimum LSA interval 5 secs. Minimum LSA arrival 1 secs
 LSA group pacing timer 240 secs
 Interface flood pacing timer 33 msecs
 Retransmission pacing timer 66 msecs
 Number of external LSA 0. Checksum Sum 0x000000
 Number of areas in this device is 1. 1 normal 0 stub 0 nssa
    Area BACKBONE(0)
        Number of interfaces in this area is 1
        MD5 Authentication, SPI 1000
        SPF algorithm executed 2 times
        Number of LSA 5. Checksum Sum 0x02A005
        Number of DCbitless LSA 0
        Number of indication LSA 0
        Number of DoNotAge LSA 0
        Flood list length 0

The table below describes the significant fields shown in the display.

Table 28. show ipv6 ospf Field Descriptions
Field	Description
Routing process "ospfv3 1" with ID 10.10.10.1	Process ID and OSPF device ID.
LSA group pacing timer	Configured LSA group pacing timer (in seconds).
Interface flood pacing timer	Configured LSA flood pacing timer (in milliseconds).
Retransmission pacing timer	Configured LSA retransmission pacing timer (in milliseconds).
Number of areas	Number of areas in device, area addresses, and so on.

Examples

The following sample output shows the show ipv6 ospf command with area encryption information:


Device# show ipv6 ospf 
Routing Process "ospfv3 1" with ID 10.0.0.1 
It is an area border device 
SPF schedule delay 5 secs, Hold time between two SPFs 10 secs 
Minimum LSA interval 5 secs. Minimum LSA arrival 1 secs 
LSA group pacing timer 240 secs 
Interface flood pacing timer 33 msecs 
Retransmission pacing timer 66 msecs 
Number of external LSA 0. Checksum Sum 0x000000 
Number of areas in this device is 2. 2 normal 0 stub 0 nssa 
Reference bandwidth unit is 100 mbps 
    Area BACKBONE(0) 
        Number of interfaces in this area is 2 
        SPF algorithm executed 3 times 
        Number of LSA 31. Checksum Sum 0x107493 
        Number of DCbitless LSA 0 
        Number of indication LSA 0 
        Number of DoNotAge LSA 20 
        Flood list length 0 
    Area 1 
        Number of interfaces in this area is 2 
        NULL Encryption SHA-1 Auth, SPI 1001 
        SPF algorithm executed 7 times 
        Number of LSA 20. Checksum Sum 0x095E6A 
        Number of DCbitless LSA 0 
        Number of indication LSA 0 
        Number of DoNotAge LSA 0 
        Flood list length 0

The table below describes the significant fields shown in the display.

Table 29. show ipv6 ospf with Area Encryption Information Field Descriptions
Field	Description
Area 1	Subsequent fields describe area 1.
NULL Encryption SHA-1 Auth, SPI 1001	Displays the encryption algorithm (in this case, null, meaning no encryption algorithm is used), the authentication algorithm (SHA-1), and the security policy index (SPI) value (1001).

The following example displays the configuration values for SPF and LSA throttling timers:


Device# show ipv6 ospf
 Routing Process "ospfv3 1" with ID 10.9.4.1
 Event-log enabled, Maximum number of events: 1000, Mode: cyclic
 It is an autonomous system boundary device
 Redistributing External Routes from,
    ospf 2
 Initial SPF schedule delay 5000 msecs
 Minimum hold time between two consecutive SPFs 10000 msecs
 Maximum wait time between two consecutive SPFs 10000 msecs
 Minimum LSA interval 5 secs
 Minimum LSA arrival 1000 msecs

The table below describes the significant fields shown in the display.

Table 30. show ipv6 ospf with SPF and LSA Throttling Timer Field Descriptions
Field	Description
Initial SPF schedule delay	Delay time of SPF calculations.
Minimum hold time between two consecutive SPFs	Minimum hold time between consecutive SPF calculations.
Maximum wait time between two consecutive SPFs 10000 msecs	Maximum hold time between consecutive SPF calculations.
Minimum LSA interval 5 secs	Minimum time interval (in seconds) between link-state advertisements.
Minimum LSA arrival 1000 msecs	Maximum arrival time (in milliseconds) of link-state advertisements.

The following example shows information about LSAs that are currently being rate limited:


Device# show ipv6 ospf rate-limit
List of LSAs that are in rate limit Queue
    LSAID: 0.0.0.0 Type: 0x2001 Adv Rtr: 10.55.55.55 Due in: 00:00:00.500
    LSAID: 0.0.0.0 Type: 0x2009 Adv Rtr: 10.55.55.55 Due in: 00:00:00.500

The table below describes the significant fields shown in the display.

Table 31. show ipv6 ospf rate-limit Field Descriptions
Field	Description
LSAID	Link-state ID of the LSA.
Type	Description of the LSA.
Adv Rtr	ID of the advertising device.
Due in:	Remaining time until the generation of the next event.

show ipv6 ospf traffic

To display IPv6 Open Shortest Path First Version 3 (OSPFv3) traffic statistics, use the showipv6ospftraffic command in privileged EXEC mode.

show ipv6 ospf [process-id] traffic [interface-type interface-number]

Syntax Description


`process-id`	(Optional) OSPF process ID for which you want traffic statistics (for example, queue statistics, statistics for each interface under the OSPF process, and per OSPF process statistics).
`interface-type` `interface-number`	(Optional) Type and number associated with a specific OSPF interface.

Command Default

When the showipv6ospftraffic command is entered without any arguments, global OSPF traffic statistics are displayed, including queue statistics for each OSPF process, statistics for each interface, and per OSPF process statistics.

Command Modes

Privileged EXEC

Command History


Release	Modification
12.4(6)T	This command was introduced.
12.2(31)SB2	This command was integrated into Cisco IOS Release 12.2(31)SB2.
12.2(33)SRB	This command was integrated into Cisco IOS Release 12.2(33)SRB.
12.2(33)SXH	This command was integrated into Cisco IOS Release 12.2(33)SXH.

Usage Guidelines

You can limit the displayed traffic statistics to those for a specific OSPF process by entering a value for the process-id argument, or you can limit output to traffic statistics for a specific interface associated with an OSPF process by entering values for the interface-type and interface-number arguments. To reset counters and clear statistics, use the clearipv6ospftraffic command.

Examples

The following example shows the display output for the showipv6ospftraffic command for OSPFv3:


Router# show ipv6 ospf traffic 
OSPFv3 statistics:
  Rcvd: 32 total, 0 checksum errors
        10 hello, 7 database desc, 2 link state req
        9 link state updates, 4 link state acks
        0 LSA ignored
  Sent: 45 total, 0 failed
        17 hello, 12 database desc, 2 link state req
        8 link state updates, 6 link state acks
        OSPFv3 Router with ID (10.1.1.4) (Process ID 6)
OSPFv3 queues statistic for process ID 6
  Hello queue size 0, no limit, max size 2
  Router queue size 0, limit 200, drops 0, max size 2
Interface statistics:
    Interface Serial2/0
OSPFv3 packets received/sent
  Type          Packets              Bytes
  RX Invalid    0                    0
  RX Hello      5                    196
  RX DB des     4                    172
  RX LS req     1                    52
  RX LS upd     4                    320
  RX LS ack     2                    112
  RX Total      16                   852
  TX Failed     0                    0
  TX Hello      8                    304
  TX DB des     3                    144
  TX LS req     1                    52
  TX LS upd     3                    252
  TX LS ack     3                    148
  TX Total      18                   900
OSPFv3 header errors
  Length 0, Checksum 0, Version 0, No Virtual Link 0, 
  Area Mismatch 0, Self Originated 0, Duplicate ID 0, 
  Instance ID 0, Hello 0, MTU Mismatch 0, 
  Nbr Ignored 0, Authentication 0, 
OSPFv3 LSA errors
  Type 0, Length 0, Data 0, Checksum 0, 
    Interface Ethernet0/0
OSPFv3 packets received/sent
  Type          Packets              Bytes
  RX Invalid    0                    0
  RX Hello      6                    240
  RX DB des     3                    144
  RX LS req     1                    52
  RX LS upd     5                    372
  RX LS ack     2                    152
  RX Total      17                   960
  TX Failed     0                    0
  TX Hello      11                   420
  TX DB des     9                    312
  TX LS req     1                    52
  TX LS upd     5                    376
  TX LS ack     3                    148
  TX Total      29                   1308
OSPFv3 header errors
  Length 0, Checksum 0, Version 0, No Virtual Link 0, 
  Area Mismatch 0, Self Originated 0, Duplicate ID 0, 
  Instance ID 0, Hello 0, MTU Mismatch 0, 
  Nbr Ignored 0, Authentication 0, 
OSPFv3 LSA errors
  Type 0, Length 0, Data 0, Checksum 0, 
Summary traffic statistics for process ID 6:
OSPFv3 packets received/sent
  Type          Packets              Bytes
  RX Invalid    0                    0
  RX Hello      11                   436
  RX DB des     7                    316
  RX LS req     2                    104
  RX LS upd     9                    692
  RX LS ack     4                    264
  RX Total      33                   1812
  TX Failed     0                    0
  TX Hello      19                   724
  TX DB des     12                   456
  TX LS req     2                    104
  TX LS upd     8                    628
  TX LS ack     6                    296
  TX Total      47                   2208
OSPFv3 header errors
  Length 0, Checksum 0, Version 0, No Virtual Link 0, 
  Area Mismatch 0, Self Originated 0, Duplicate ID 0, 
  Instance ID 0, Hello 0, MTU Mismatch 0, 
  Nbr Ignored 0, Authentication 0, 
OSPFv3 LSA errors
  Type 0, Length 0, Data 0, Checksum 0,

The network administrator wants to start collecting new statistics, resetting the counters and clearing the traffic statistics by entering the clearipv6ospftraffic command as follows:


Router# clear ipv6 ospf traffic

The table below describes the significant fields shown in the display.

Table 32. show ipv6 ospf traffic Field Descriptions

Field

Description

OSPFv3 statistics

Traffic statistics accumulated for all OSPF processes running on the router. To ensure compatibility with the showiptraffic command, only checksum errors are displayed. Identifies the route map name.

OSPFv3 queues statistic for process ID

Queue statistics specific to Cisco IOS software.

Hello queue

Statistics for the internal Cisco IOS queue between the packet switching code (process IP Input) and the OSPF hello process for all received OSPF packets.

Router queue

Statistics for the internal Cisco IOS queue between the OSPF hello process and the OSPF router for all received OSPF packets except OSPF hellos.

queue size

Actual size of the queue.

queue limit

Maximum allowed size of the queue.

queue max size

Maximum recorded size of the queue.

Interface statistics

Per-interface traffic statistics for all interfaces that belong to the specific OSPFv3 process ID.

OSPFv3 packets received/sent

Number of OSPFv3 packets received and sent on the interface, sorted by packet types.

OSPFv3 header errors

Packet appears in this section if it was discarded because of an error in the header of an OSPFv3 packet. The discarded packet is counted under the appropriate discard reason.

OSPFv3 LSA errors

Packet appears in this section if it was discarded because of an error in the header of an OSPF link-state advertisement (LSA). The discarded packet is counted under the appropriate discard reason.

Summary traffic statistics for process ID

Summary traffic statistics accumulated for an OSPFv3 process.

Note

The OSPF process ID is a unique value assigned to the OSPFv3 process in the configuration.

The value for the received errors is the sum of the OSPFv3 header errors that are detected by the OSPFv3 process, unlike the sum of the checksum errors that are listed in the global OSPF statistics.

Related Commands


Command	Description
clear ip ospf traffic	Clears OSPFv2 traffic statistics.
clear ipv6 ospf traffic	Clears OSPFv3 traffic statistics.
show ip ospf traffic	Displays OSPFv2 traffic statistics.

show ospfv3 multi-area

To display information about the Open Shortest Path First version 3 (OSPFv3) multiarea interfaces, use the show ospfv3 multi-area command in user EXEC or privileged EXEC mode.

show ospfv3 multi-area

Command Default

No OSPFv3 multiarea interface information is displayed.

Command Modes

User EXEC (>)
Privileged EXEC (#)

Command History


Release	Modification
Cisco IOS XE Release 3.11S	This command was introduced.

Examples

The following example shows sample output from the show ospfv3 multi-area command:


Device# show ip ospf 1 multi-area

OSPF_MA1 is up, line protocol is up
  Primary Interface Ethernet0/0, Area 100
  Interface ID 7
  MTU is 1500 bytes
  Neighbor Count is 1

Related Commands


Command	Description
ospfv3 multi-area cost	Specifies the cost of sending a packet on an OSPFv3 multiarea interface.

show ospfv3 sham-links

To display parameters and the current state of Open Shortest Path First version 3 (OSPFv3) sham links, use the show ospfv3 sham-links command in user EXEC or privileged EXEC mode.

show ospfv3 [process-id] [address-family] [vrf {vrf-name | *}] sham-links

Syntax Description


`process-id`	(Optional) Internal identification. The number used here is the number assigned administratively when enabling the OSPFv3 routing process and can be a value from 1 through 65535.
`address-family`	(Optional) Enter ipv6 for the IPv6 address family or ipv4 for the IPv4 address family.
vrf	(Optional) VPN Routing/Forwarding instance.
{`vrf-name` \| *}	The virtual routing and forwarding table for which the information should be displayed. If this parameter is not specified, only information for the global routing table is shown. A VRF name of "*" displays information for all VRFs, including the global table.

Command Modes

User EXEC or Privileged EXEC

Command History


Release	Modification
Cisco IOS XE Release 3.6S	This command was introduced.
15.2(4)S	This command was integrated into Cisco IOS Release 15.2(4)S.
15.2(4)M	This command was integrated into Cisco IOS Release 15.2(4)M.

Examples

The following example displays OSPFv3 sham-link information for all VRFs:


Router# show ospfv3 vrf * sham-links

OSPFv3 1 address-family ipv6 vrf v1 (router-id 8.0.0.22)

Sham Link OSPFv3_SL1 to address 2001:111::824 is up
   Interface ID 39
   Area 0 source address 2001:111::822
   Run as demand circuit
   DoNotAge LSA allowed.
   Cost of using 1
   Transmit Delay is 1 sec, State POINT_TO_POINT,
   Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
     Adjacency State FULL (Hello suppressed)
     Index 1/2/2, retransmission queue length 0, number of retransmission 0
     First 0x0(0)/0x0(0)/0x0(0) Next 0x0(0)/0x0(0)/0x0(0)
     Last retransmission scan length is 0, maximum is 0
     Last retransmission scan time is 0 msec, maximum is 0 msec

Table 1
show ospfv3 virtual-links Field Descriptions Field Description

Sham Link OSPFv3_SL1 to address 2001:111::824 is up Specifies the
OSPFv3 neighbor, and if the link to that neighbor is up or down.

Interface ID Interface ID and IPv6 address of the router.

Area 0 source address 2001:111::822 The area the sham link is in and the IPv6 source address of the local
endpoint.

Cost of using 1 The cost of reaching the OSPFv3 neighbor through the sham link.

Transmit Delay is 1 sec The transmit delay (in seconds) on the sham link.

State POINT_TO_POINT The state of the OSPFv3 neighbor.

Timer intervals... The various timer intervals configured for the link.

Adjacency State FULL (Hello suppressed)  The neighbor adjacency state.

show tech-support ospf

To run show commands that display OSPF information that is useful to Cisco Technical Support personnel in resolving issues, use the show tech-support ospf command in the privileged EXEC mode.

show tech-support ospf [vrf vrf-instance-name] [process-id] [detail]

Syntax Description


vrf `vrf-instance-name`	(Optional) Displays tech-support information for a VPN Routing/Forwarding instance. If you enter vrf `vrf-instance-name` with the show tech-support ospf command, the following commands are executed for the specified VRF: show ip route summary vrf `vrf-instance-name` show ip route ospf vrf `vrf-instance-name` If you do not enter vrf `vrf-instance-name` with the show tech-support ospf command, show ip route summary and show ip route ospf are executed for the default VRF.
`process-id`	(Optional) ID of the OSPF process.
detail	(Optional) Displays detailed OSPF information. If you enter the detail keyword with the show tech-support ospf command, the OSPF-related show commands are run to provide more detailed output. However, the detail keyword has no effect on the output of show ip route summary and show ip route ospf .

Command Default

If you do not specify any options, all OSPF information is collected.

Command Modes

Privileged EXEC

Command History


Release	Modification
Cisco IOS XE Gibraltar 16.12.1a	Functionality to display OSPF information for a VRF instance introduced.

Usage Guidelines

This command generates tech-support information that is useful for Cisco Technical Support representatives when troubleshooting OSPF issues on a router.

Tip

This command can generate a very large amount of output. You may want to redirect the output to a file using the file send-to keyword and argument. Redirecting the output to a file also makes sending the output to your Cisco Technical Support representative easier.

Note

This command is not required during normal use of the router.

The following show commands run automatically when you run the show tech-support ospf command:

show ip ospf
show ip ospf neighbor
show ip ospf interface
show ip ospf database database-summary
show ip ospf max-metric
show ip ospf multi-area
show ip ospf border-routers
show ip ospf fast-reroute
show ip ospf fast-reroute prefix-summary
show ip ospf neighbor fast-reroute
show ip ospf fast-reroute remote-lfa tunnels internal
show ip ospf fast-reroute ti-lfa
show ip ospf fast-reroute ti-lfa tunnels
show ip ospf fast-reroute ti-lfa tunnels internal all
show ip ospf summary-address
show ip ospf virtual-links
show ip ospf statistic
show ip ospf topology-info
show ip ospf traffic
show ip ospf rib
show ip ospf rib redistribution
show ip route summary
show ip route ospf
show interfaces
show ip ospf flood-list
show ip ospf request-list
show ip ospf retransmission-list
show ip ospf database
show ip ospf segment-routing
show ip ospf segment-routing conflicts internal
show ip ospf segment-routing global-block
show ip ospf segment-routing local-prefix
show ip ospf segment-routing mapping-server
show ip ospf segment-routing protected-adjacencies
show ip ospf segment-routing sid-database internal
show segment-routing mpls connected-prefix-sid-map ipv4
show segment-routing mpls connected-prefix-sid-map protocol backup ipv4
show segment-routing mpls mapping-server ipv4
show segment-routing mpls mapping-server remote backup ipv4
show mpls traffic-eng segment-routing ospf
show mpls traffic-eng segment-routing prefix
show ip ospf database dist-ls-pending
show ip ospf ls-distribution
show ip ospf database
show ip ospf database database-summary
show ip ospf database router
show ip ospf database network
show ip ospf database summary
show ip ospf database external
show ip ospf database asbr-summary
show ip ospf database nssa-external
show ip ospf database opaque-area
show ip ospf database opaque-as
show ip ospf database opaque-link
show ip ospf maxage-list
show ip ospf route-list
show ip ospf bad-checksum
show ip ospf mpls ldp interface
show ip ospf mpls traffic-eng fragment
show ip ospf mpls traffic-eng link
show ip ospf nsf
show ip ospf sham-links
show ip ospf timers rate-limit
show ip ospf timers lsa-group
show ip ospf events

shutdown (router OSPF)

To initiate a graceful shutdown of the Open Shortest Path First (OSPF) protocol under the current instance, use the shutdown command in router configuration mode. To restart the OSPF protocol, use the no form of this command.

shutdown

no shutdown

Syntax Description

This command has no arguments or keywords.

Command Default

OSPF stays active under the current instance.

Command Modes

Router configuration (config-router)

Command History


Release	Modification
12.2(33)SRC	This command was introduced.
15.0(1)M	This command was integrated into Cisco IOS Release 15.0(1)M.

Usage Guidelines

Use the shutdown command in router configuration mode to temporarily shut down a protocol in the least disruptive manner and to notify its neighbors that it is going away. All traffic that has another path through the network will be directed to that alternate path.

Examples

The following example shows how to enable a graceful shutdown of the OSPF protocol:


Router(config
)
# router ospf 1
Router(config-router
)
# shutdown

Related Commands


Command	Description
ip ospf shutdown	Initiates a graceful shutdown on a specific OSPF interface.

snmp-server enable traps ospf

T o enable all Simple Network Management Protocol (SNMP) notifications for Open Shortest Path First (OSPF), use the snmp-server enable traps ospf command in global configuration mode. To disable all SNMP notifications for OSPF, use the no form of this command.

snmp-server enable traps ospf

no snmp-server enable traps ospf

Syntax Description

This command has no arguments or keywords.

Command Default

SNMP notifications for OSPF are disabled.

Command Modes

Global configuration

Command History


Release	Modification
12.0(30)S	This command was introduced.
12.3(14)T	This command was integrated into Cisco IOS Release 12.3(14)T.
12.2(25)S	This command was integrated into Cisco IOS Release 12.2(25)S.
12.2(27)SBC	This command was integrated into Cisco IOS Release 12.2(27)SBC.
12.2(31)SB2	This command was integrated into Cisco IOS Release 12.2(31)SB2.

Usage Guidelines

If you wish to enable or disable specific OSPF SNMP notifications, enter one or more of the following commands of the following commands:

[no ] snmp-server enable traps ospf cisco-specific errors

[no ] snmp-server enable traps ospf cisco-specific lsa

[no ] snmp-server enable traps ospf cisco-specific retransmit

[no ] snmp-server enable traps ospf cisco-specific state-change

[no ] snmp-server enable traps ospf errors

[no ] snmp-server enable traps ospf lsa

[no ] snmp-server enable traps ospf retransmit

[no ] snmp-server enable traps ospf state-change

Examples

The following exampleglobally enables SNMP notifications for OSPF:


Router(config)# snmp-server enable traps ospf

Related Commands


Command	Description
snmp-server enable traps ospf cisco-specific errors config-error	Enables SNMP notifications for OSPF nonvirtual interface mismatch errors.
snmp-server enable traps ospf cisco-specific lsa	Enables SNMP notifications for OSPF opaque LSAs.
snmp-server enable traps ospf cisco-specific retransmit	Enables SNMP notifications for OSPF Cisco-specific retransmission errors.
snmp-server enable traps ospf cisco-specific state-change	Enables SNMP notifications for OSPF Cisco-specific transition state changes.
snmp-server enable traps ospf errors	Enables SNMP notifications for OSPF errors.
snmp-server enable traps ospf lsa	Enables SNMP notifications for OSPF LSAs.
snmp-server enable traps ospf rate-limit	Limits the number of OSPF traps that are sent during a specified number of seconds.
snmp-server enable traps ospf retransmit	Enables SNMP notifications for OSPF packet retransmissions.
snmp-server enable traps ospf state-change	Enables SNMP notifications for OSPF transition state changes.

snmp-server enable traps ospf cisco-specific errors

T o enable Simple Network Management Protocol (SNMP) notifications for Open Shortest Path First (OSPF) configuration mismatch errors, use the snmp-server enable traps ospf cisco-specific errors command in global configuration mode. To disable SNMP notifications for OSPF configuration mismatch errors, use the no form of this command.

snmp-server enable traps ospf cisco-specific errors [config-error] [virt-config-error]

no snmp-server enable traps ospf cisco-specific errors [config-error] [virt-config-error]

Syntax Description


config-error	(Optional) Enables SNMP notifications only for configuration mismatch errors on nonvirtual interfaces.
virt-config-error	(Optional) Enables SNMP notifications only for configuration mismatch errors on virtual interfaces.

Command Default

SNMP notifications for OSPF configuration mismatch errors are disabled.

Command Modes

Global configuration

Command History


Release	Modification
12.0(30)S	This command was introduced.
12.3(14)T	This command was integrated into Cisco IOS Release 12.3(14)T.
12.2(25)S	This command was integrated into Cisco IOS Release 12.2(25)S.
12.2(27)SBC	This command was integrated into Cisco IOS Release 12.2(27)SBC.
12.2(31)SB2	This command was integrated into Cisco IOS Release 12.2(31)SB2.

Usage Guidelines

To enable the SNMP notifications for OSPF configuration errors for both virtual and nonvirtual interfaces, enter the snmp-server enable traps ospf cisco-specific errors command in global configuration mode without the optional keywords.

Examples

The following example enables the router to send OSPF configuration mismatch errors only for nonvirtual interfaces:


Router(config)# snmp-server enable traps ospf cisco-specific errors config-error

Related Commands


Command	Description
snmp-server enable traps ospf	Enables all SNMP notifications for OSPF.
snmp-server enable traps ospf cisco-specific lsa	Enables SNMP notifications for OSPF opaque LSAs.
snmp-server enable traps ospf cisco-specific retransmit	Enables SNMP notifications for OSPF Cisco-specific retransmission errors.
snmp-server enable traps ospf cisco-specific state-change	Enables SNMP notifications for OSPF Cisco-specific transition state changes.
snmp-server enable traps ospf errors	Enables SNMP notifications for OSPF errors.
snmp-server enable traps ospf lsa	Enables SNMP notifications for OSPF LSAs.
snmp-server enable traps ospf rate-limit	Limits the number of OSPF traps that are sent during a specified number of seconds.
snmp-server enable traps ospf retransmit	Enables SNMP notifications for OSPF packet retransmissions.
snmp-server enable traps ospf state-change	Enables SNMP notifications for OSPF transition state changes.

snmp-server enable traps ospf cisco-specific errors config-error

To e nable Simple Network Management Protocol (SNMP) notifications for Open Shortest Path First (OSPF) nonvirtual interface mismatch errors, use the snmp-server enable traps ospf cisco-specific errors config-error command in global configuration mode. To disable OSPF nonvirtual interface mismatch error SNMP notifications, use the no form of this command.

snmp-server enable traps ospf cisco-specific errors config-error

no snmp-server enable traps ospf cisco-specific errors config-error

Syntax Description

This command has no keywords or arguments.

Command Default

This command is disabled by default; therefore, SNMP notifications for OSPF nonvirtual interface mismatch errors are not created.

Command Modes

Global configuration

Command History


Release	Modification
12.3(5)	This command was introduced.
12.3(4)T	This command was integrated into Cisco IOS Release 12.3(4)T.
12.0(26)S	This command was integrated into Cisco IOS Release 12.0(26)S.
12.2(25)S	This command was integrated into Cisco IOS Release 12.2(25)S.
12.2(33)SRA	This command was integrated into Cisco IOS Release 12.2(33)SRA.
12.2(31)SB2	This command was integrated into Cisco IOS Release 12.2(31)SB2.
12.2(33)SXH	This command was integrated into Cisco IOS Release 12.2(33)SXH.

Usage Guidelines

To enable the cospfShamLinkConfigError trap, you must first enter the snmp-server enable traps ospf cisco-specific errors config-error command in global configuration mode. The snmp-server enable traps ospf cisco-specific errors config-error command enables the cospfConfigError trap, so that both traps can be generated at the same place and maintain consistency with a similar case for configuration errors across virtual links.

If you try to enable the cospfShamLinkConfigError trap before configuring the cospfospfConfigError trap you will receive an error message stating you must first configure the cospfConfigError trap.

Examples

The following example enables the router to send nonvirtual interface mismatch error notifications to the host at the address myhost.cisco.com using the community string defined as public:


Router(config)# snmp-server enable traps ospf cisco-specific errors config-error
Router(config)# snmp-server host myhost.cisco.com informs version 2c public

Related Commands


Command	Description
snmp-server enable traps ospf cisco-specific errors shamlink	Enables SNMP notifications for OSPF sham-link errors.
snmp-server enable traps ospf cisco-specific retransmit	Enables SNMP notifications for OSPF retransmission errors.
snmp-server enable traps ospf cisco-specific state-change	Enables SNMP notifications for OSPF transition state changes.

snmp-server enable traps ospf cisco-specific errors shamlink

T o enable Simple Network Management Protocol (SNMP) notifications for Open Shortest Path First (OSPF) sham-link errors, use the snmp-server enable traps ospf cisco-specific errors shamlink command in global configuration mode. To disable OSPF sham-link error SNMP notifications, use the no form of this command.

snmp-server enable traps ospf cisco-specific errors shamlink [authentication [bad-packet] [ [config] | config [bad-packet]]]

no snmp-server enable traps ospf cisco-specific errors shamlink [authentication [bad-packet] [ [config] | config [bad-packet]]]

Syntax Description


authentication	(Optional) Enables SNMP notifications only for authentication failures on OSPF sham-link interfaces.
bad-packet	(Optional) Enables SNMP notifications only for packet parsing failures on OSPF sham-link interfaces.
config	(Optional) Enables SNMP notifications only for configuration mismatch errors on OSPF sham-link interfaces.

Command Default

This command is disabled by default; therefore, SNMP notifications for OSPF sham-link errors are not created.

Command Modes

Global configuration

Command History


Release	Modification
12.0(30)S	This command was introduced.
12.3(14)T	This command was integrated into Cisco IOS Release 12.3(14)T.
12.2(33)SRA	This command was integrated into Cisco IOS Release 12.2(33)SRA.
12.2(31)SB2	This command was integrated into Cisco IOS Release 12.2(31)SB2.
12.2(33)SXH	This command was integrated into Cisco IOS Release 12.2(33)SXH.

Usage Guidelines

To enable the cospfShamLinkConfigError trap, you must first enter the snmp-server enable traps ospf cisco-specific errors config-error command in global configuration mode. The snmp-server enable traps ospf cisco-specific errors config-error command enables the cospfConfigError trap, so that both traps can be generated at the same place and maintain consistency with a similar case for configuration errors across virtual links.

If you try to enable the cospfShamLinkConfigError trap before configuring the cospfospfConfigError trap you will receive an error message stating you must first configure the cospfConfigError trap.

Examples

The following example enables the router to send OSPF sham-link error notifications to the host at the address myhost.cisco.com using the community string defined as public:


Router(config)# snmp-server enable traps ospf cisco-specific errors config-error
Router(config)# snmp-server enable traps ospf cisco-specific errors shamlink
Router(config)# snmp-server host myhost.cisco.com informs version 2c public

Related Commands


Command	Description
snmp-server enable traps ospf cisco-specific errors config-error	Enables SNMP notifications for OSPF nonvirtual interface mismatch errors.
snmp-server enable traps ospf cisco-specific retransmit	Enables SNMP notifications for OSPF retransmission errors.
snmp-server enable traps ospf cisco-specific state-change	Enables SNMP notifications for OSPF transition state changes.

snmp-server enable traps ospf cisco-specific lsa

T o enable Simple Network Management Protocol (SNMP) notifications for Open Shortest Path First (OSPF) opaque link-state advertisements (LSAs), use the snmp-server enable traps ospf cisco-specific lsa command in global configuration mode. To disable SNMP notifications for OSPF opaque LSAs, use the no form of this command.

snmp-server enable traps ospf cisco-specific lsa [lsa-maxage] [lsa-originate]

no snmp-server enable traps ospf cisco-specific lsa [lsa-maxage] [lsa-originate]

Syntax Description


lsa-maxage	(Optional) Enables SNMP notifications only for opaque OSPF LSAs that have reached the maximum age.
lsa-originate	(Optional) Enables SNMP notifications only for opaque OSPF LSAs that are newly originated.

Command Default

SNMP notifications for OSPF opaque LSAs are disabled.

Command Modes

Global configuration

Command History


Release	Modification
12.0(30)S	This command was introduced.
12.3(14)T	This command was integrated into Cisco IOS Release 12.3(14)T.
12.2(25)S	This command was integrated into Cisco IOS Release 12.2(25)S.
12.2(27)SBC	This command was integrated into Cisco IOS Release 12.2(27)SBC.
12.2(31)SB2	This command was integrated into Cisco IOS Release 12.2(31)SB2.

Usage Guidelines

The snmp-server enable traps ospf cisco-specific lsa command enables the traps that are defined by the CISCO-OSPF-TRAP-MIB for opaque LSAs. An opaque link-state advertisement (LSA) is used in MPLS traffic engineering to distribute attributes such as capacity and topology of links in a network. The scope of this LSA can be confined to the local network (Type 9, Link-Local), OSPF area (Type 20, Area-Local), or Autonomous System (Type 11, AS scope). The information in an opaque LSA can be used by an external application across the OSPF network. To enable the cospfMaxAgeLsa trap, enter the snmp-server enable traps ospf cisco-specific lsa command with the lsa-maxage keyword. To enable the cospfOriginateLsa trap, enter the snmp-server enable traps ospf cisco-specific lsa command with the lsa-originate keyword. When you enter the snmp-server enable traps ospf cisco-specific lsa command without either keyword, both traps will be enabled.

Examples

The following example enables the router to send OSPF opaque LSA notifications to the host at the address myhost.cisco.com using the community string defined as public whenever new opaque LSAs are created:


Router(config)# snmp-server enable traps ospf cisco-specific lsa lsa-originate
Router(config)# snmp-server host myhost.cisco.com informs version 2c public

Related Commands


Command	Description
snmp-server enable traps ospf	Enables all SNMP notifications for OSPF.
snmp-server enable traps ospf cisco-specific retransmit	Enables SNMP notifications for OSPF Cisco-specific retransmission errors.
snmp-server enable traps ospf cisco-specific state-change	Enables SNMP notifications for OSPF Cisco-specific transition state changes.
snmp-server enable traps ospf errors	Enables SNMP notifications for OSPF errors.
snmp-server enable traps ospf lsa	Enables SNMP notifications for OSPF LSAs.
snmp-server enable traps ospf rate-limit	Limits the number of OSPF traps that are sent during a specified number of seconds.
snmp-server enable traps ospf retransmit	Enables SNMP notifications for OSPF packet retransmissions.
snmp-server enable traps ospf state-change	Enables SNMP notifications for OSPF transition state changes.
snmp-server host	Specifies a recipient (target host) for SNMP notification operations.

snmp-server enable traps ospf cisco-specific retransmit

T o enable Simple Network Management Protocol (SNMP) notifications for Open Shortest Path First (OSPF) retransmission errors, use the snmp-server enable traps ospf cisco-specific retransmit command in global configuration mode. To disable OSPF sham-link error SNMP notifications, use the no form of this command.

snmp-server enable traps ospf cisco-specific retransmit [packets [shamlink | virt-packets] | shamlink [packets | virt-packets] | virt-packets [shamlink]]

no snmp-server enable traps ospf cisco-specific retransmit [packets [shamlink | virt-packets] | shamlink [packets | virt-packets] | virt-packets [shamlink]]

Syntax Description


packets	(Optional) Enables SNMP notifications only for packet retransmissions on nonvirtual interfaces.
shamlink	(Optional) Enables SNMP notifications only for sham-link retransmission notifications.
virt-packets	(Optional) Enables SNMP notifications only for packet retransmissions on virtual interfaces.

Command Default

This command is disabled by default; therefore, SNMP notifications for OSPF retransmission errors are not created.

Command Modes

Global configuration

Command History


Release	Modification
12.3(5)	This command was introduced.
12.3(4)T	This command was integrated into Cisco IOS Release 12.3(4)T.
12.0(26)S	This command was integrated into Cisco IOS Release 12.0(26)S.
12.2(25)S	This command was integrated into Cisco IOS Release 12.2(25)S.
12.0(30)S	The shamlink keyword and related options were added.
12.3(14)T	Support was added for the shamlink keyword and related options.
12.2(33)SRA	This command was integrated into Cisco IOS Release 12.2(33)SRA.
12.2(31)SB2	This command was integrated into Cisco IOS Release 12.2(31)SB2.
12.2(33)SXH	This command was integrated into Cisco IOS Release 12.2(33)SXH.

Examples

The following example enables the router to send OSPF sham-link retransmission notifications:


Router(config)# snmp-server enable traps ospf cisco-specific retransmit shamlink

Related Commands


Command	Description
snmp-server enable traps ospf cisco-specific errors config-error	Enables SNMP notifications for OSPF nonvirtual interface mismatch errors.
snmp-server enable traps ospf cisco-specific errors shamlink	Enables SNMP notifications for OSPF sham-link errors.
snmp-server enable traps ospf cisco-specific state-change	Enables SNMP notifications for OSPF transition state changes.

snmp-server enable traps ospf cisco-specific state-change

T o enable Simple Network Management Protocol (SNMP) notifications for Open Shortest Path First (OSPF) transition state changes, use the snmp-server enable traps ospf cisco-specific state-change command in global configuration mode. To disable OSPF transition state change SNMP notifications, use the no form of this command.

snmp-server enable traps ospf cisco-specific state-change [nssa-trans-change | shamlink [interface | interface-old | neighbor]]

no snmp-server enable traps ospf cisco-specific state-change [nssa-trans-change | shamlink [interface | interface-old | neighbor]]

Syntax Description


nssa-trans-change	(Optional) Enables only not-so-stubby area (NSSA) translator state changes trap for the OSPF area.
shamlink	(Optional) Enables only the sham-link transition state changes trap for the OSPF area.
interface	(Optional) Enables only the sham-link interface state changes trap for the OSPF area.
interface -old	(Optional) Enables only the replaced interface transition state changes trap for the OSPF area.
neighbor	(Optional) Enables only the sham-link neighbor transition state changes trap for the OSPF area.

Command Default

This command is disabled by default; therefore, SNMP notifications for OSPF transition state changes are not created.

Command Modes

Global configuration

Command History


Release	Modification
12.3(5)	This command was introduced.
12.3(4)T	This command was integrated into Cisco IOS Release 12.3(4)T.
12.0(26)S	This command was integrated into Cisco IOS Release 12.0(26)S.
12.2(25)S	This command was integrated into Cisco IOS Release 12.2(25)S.
12.0(30)S	The shamlink , interface-old , and neighbor keywords were added.
12.3(14)T	Support was added for the shamlink , interface-old , and neighbor keywords.
12.2(33)SRA	This command was integrated into Cisco IOS Release 12.2(33)SRA.
12.2(31)SB2	This command was integrated into Cisco IOS Release 12.2(31)SB2.
12.2(33)SXH	This command was integrated into Cisco IOS Release 12.2(33)SXH.

Usage Guidelines

You cannot enter both the interface and interface-old keywords because you cannot enable both the new and replaced sham-link interface transition state change traps. You can configure only one of the two traps, but not both.

Examples

The following example enables the router to send OSPF sham-link transition state change notifications to the host at the address myhost.cisco.com using the community string defined as public:


Router(config)# snmp-server enable traps ospf cisco-specific state-change shamlink
Router(config)# snmp-server host myhost.cisco.com informs version 2c public

Related Commands


Command	Description
snmp-server enable traps ospf cisco-specific errors config-error	Enables SNMP notifications for OSPF nonvirtual interface mismatch errors.
snmp-server enable traps ospf cisco-specific errors shamlink	Enables SNMP notifications for OSPF sham-link errors.
snmp-server enable traps ospf cisco-specific retransmit	Enables SNMP notifications for OSPF retransmission errors.

snmp-server enable traps ospf errors

T o enable Simple Network Management Protocol (SNMP) notifications for Open Shortest Path First (OSPF) errors, use the snmp-server enable traps ospf errors command in global configuration mode. To disable SNMP notifications for OSPF errors, use the no form of this command.

snmp-server enable traps ospf errors [authentication-failure] [bad-packet] [config-error] [virt-authentication-failure] [virt-bad-packet] [virt-config-error]

no snmp-server enable traps ospf errors [authentication-failure] [bad-packet] [config-error] [virt-authentication-failure] [virt-bad-packet] [virt-config-error]

Syntax Description


authentication-failure	(Optional) Enables only the ospfIfFailure trap. Allows SNMP notifications to be sent when a packet has been received on a nonvirtual interface from a neighbor router whose authentication key or authentication type conflicts with the authentication key or authentication type of this router.
bad-packet	(Optional) Enables only the ospfIfRxBadPacket trap. Allows SNMP notifications to be sent when an OSPF packet that has not been parsed has been received on a nonvirtual interface.
config-error	(Optional) Enables only the ospfIfConfigError trap. Sends SNMP notifications when a packet has been received in a nonvirtual interface from a neighbor router whose configuration parameters conflict with the configuration parameters of this router.
virt-authentication-failure	(Optional) Enables only the ospfVirtIfFailure trap. Allows SNMP notifications to be sent when a packet has been received on a virtual interface from a neighbor router whose authentication key or authentication type conflicts with the authentication key or authentication type of this router.
virt-bad-packet	(Optional) Enables only the ospfVirtIfRxBadPacket trap. Allows SNMP notifications to be sent when an OSPF packet that has not been parsed has been received on a virtual interface.
virt-config-error	(Optional) Enables only the ospfVirtIfConfigError trap. Sends SNMP notifications when a packet has been received in a virtual interface from a neighbor router whose configuration parameters conflict with the configuration parameters of this router.

Command Default

SNMP notifications for OSPF errors are disabled.

Command Modes

Global configuration

Command History


Release	Modification
12.3(5)	This command was introduced.
12.0(26)S	This command was integrated into Cisco IOS Release 12.0(26)S. Support was added for the OSPF MIB.
12.3(4)T	This command was integrated into Cisco IOS Release 12.3(4)T.
12.2(25)S	This command was integrated into Cisco IOS Release 12.2(25)S.
12.2(27)SBC	This command was integrated into Cisco IOS Release 12.2(27)SBC.
12.2(31)SB2	This command was integrated into Cisco IOS Release 12.2(31)SB2.

Usage Guidelines

When you enter the snmp-server enable traps ospf errors command without any optional keywords, all OSPF error traps will be enabled. To enable only one or more OSPF error traps, enter one or more of the optional keywords.

Examples

The following example enables the router to send all OSPF error notifications:


Router(config)# snmp-server enable traps ospf errors

Related Commands


Command	Description
snmp-server enable traps ospf	Enables all SNMP notifications for OSPF.
snmp-server enable traps ospf cisco-specific errors config-error	Enables SNMP notifications for OSPF nonvirtual interface mismatch errors.
snmp-server enable traps ospf cisco-specific lsa	Enables SNMP notifications for OSPF opaque LSAs.
snmp-server enable traps ospf cisco-specific retransmit	Enables SNMP notifications for OSPF Cisco-specific retransmission errors.
snmp-server enable traps ospf cisco-specific state-change	Enables SNMP notifications for OSPF Cisco-specific transition state changes.
snmp-server enable traps ospf lsa	Enables SNMP notifications for OSPF LSAs.
snmp-server enable traps ospf rate-limit	Limits the number of OSPF traps that are sent during a specified number of seconds.
snmp-server enable traps ospf retransmit	Enables SNMP notifications for OSPF packet retransmissions.
snmp-server enable traps ospf state-change	Enables SNMP notifications for OSPF transition state changes.

snmp-server enable traps ospf lsa

T o enable Simple Network Management Protocol (SNMP) notifications for Open Shortest Path First (OSPF) link-state advertisements (LSAs), use the snmp-server enable traps ospf lsa command in global configuration mode. To disable SNMP notifications for OSPF LSAs, use the no form of this command.

snmp-server enable traps ospf lsa [lsa-maxage] [lsa-originate]

no snmp-server enable traps ospf lsa [lsa-maxage] [lsa-originate]

Syntax Description


lsa-maxage	(Optional) Enables only the ospfMaxAgeLsa trap. Allows SNMP notifications to be sent when an LSA in the OSPF link-state database of the router has reached the maximum age.
lsa-originate	(Optional) Enables only the ospfOriginateLsa trap. Enables SNMP notifications when a new LSA has been originated by the router as a result of a topology change.

Command Default

SNMP notifications for OSPF LSAs are disabled.

Command Modes

Global configuration

Command History


Release	Modification
12.3(5)	This command was introduced.
12.0(26)S	This command was integrated into Cisco IOS Release 12.0(26)S. Support was added for the OSPF MIB.
12.3(4)T	This command was integrated into Cisco IOS Release 12.3(4)T.
12.2(25)S	This command was integrated into Cisco IOS Release 12.2(25)S.
12.2(27)SBC	This command was integrated into Cisco IOS Release 12.2(27)SBC.
12.2(31)SB2	This command was integrated into Cisco IOS Release 12.2(31)SB2.

Usage Guidelines

The snmp-server enable traps ospf lsa command enables the traps for standard LSAs that are defined by the OSPF-MIB. To enable the ospfMaxAgeLsa trap, enter the snmp-server enable traps ospf lsa command with the lsa-maxage keyword. To enable the ospfOriginateLsa trap, enter the snmp-server enable traps ospf lsa command with the lsa-originate keyword. When the ospfOriginateLsa trap is enabled, it will not be invoked for simple LSA refreshes that take place every 30 minutes or when an LSA has reached its maximum age and is being flushed. When you enter the snmp-server enable traps ospf lsa command without either keyword, both traps will be enabled.

To enable the traps that are defined by the CISCO-OSPF-TRAP-MIB for opaque LSAs, enter the snmp-server enable traps ospf cisco-specific lsa command in global configuration mode.

Examples

The following example enables the router to send SNMP notifications when new LSAs are originated by the router as a result of a topology change:


Router(config)# snmp-server enable traps ospf lsa lsa-originate

Related Commands


Command	Description
snmp-server enable traps ospf	Enables all SNMP notifications for OSPF.
snmp-server enable traps ospf cisco-specific errors config-error	Enables SNMP notifications for OSPF nonvirtual interface mismatch errors.
snmp-server enable traps ospf cisco-specific lsa	Enables SNMP notifications for OSPF opaque LSAs.
snmp-server enable traps ospf cisco-specific retransmit	Enables SNMP notifications for OSPF Cisco-specific retransmission errors.
snmp-server enable traps ospf cisco-specific state-change	Enables SNMP notifications for OSPF Cisco-specific transition state changes.
snmp-server enable traps ospf errors	Enables SNMP notifications for OSPF errors.
snmp-server enable traps ospf rate-limit	Limits the number of OSPF traps that are sent during a specified number of seconds.
snmp-server enable traps ospf retransmit	Enables SNMP notifications for OSPF packet retransmissions.
snmp-server enable traps ospf state-change	Enables SNMP notifications for OSPF transition state changes.

snmp-server enable traps ospf rate-limit

T o limit the number of Open Shortest Path First (OSPF) traps that are sent during a specified number of seconds, use the snmp-server enable traps ospf rate-limit command in global configuration mode. To disable the limit placed on the number of OSPF traps sent during a specified number of seconds, use the no form of this command.

snmp-server enable traps ospf rate-limit seconds trap-number

no snmp-server enable traps ospf rate-limit seconds trap-number

Syntax Description


`seconds`	Sets the rate limit window size, in seconds. A number from 2 to 60. The default value is 10.
`trap-number`	Sets the maximum number of traps sent during the window time. A number from 0 to 300. The default number is 7.

Command Default

No limit is placed on the number of OSPF traps sent.

Command Modes

Global configuration

Command History


Release	Modification
12.0(26)S	This command was introduced.
12.3(4)T	This command was integrated into Cisco IOS Release 12.3(4)T.
12.2(25)S	This command was integrated into Cisco IOS Release 12.2(25)S.
12.2(27)SBC	This command was integrated into Cisco IOS Release 12.2(27)SBC.
12.2(31)SB2	This command was integrated into Cisco IOS Release 12.2(31)SB2.

Usage Guidelines

There is a possibility that a router sends trap bursts, which can drain network resources in a small interval of time. It is recommended that you enter the snmp-server enable traps ospf rate-limit command to configure a sliding window mechanism that will limit the number of traps that are sent within a specified number of seconds.

Examples

The following example sets the trap rate limit window so that during a 40-second window of time, no more that 50 traps are sent.


Router(config)# snmp-server enable traps ospf rate-limit 40 50

Related Commands


Command	Description
snmp-server enable traps ospf	Enables all SNMP notifications for OSPF.
snmp-server enable traps ospf cisco-specific errors config-error	Enables SNMP notifications for OSPF nonvirtual interface mismatch errors.
snmp-server enable traps ospf cisco-specific lsa	Enables SNMP notifications for OSPF opaque LSAs.
snmp-server enable traps ospf cisco-specific retransmit	Enables SNMP notifications for OSPF Cisco-specific retransmission errors.
snmp-server enable traps ospf cisco-specific state-change	Enables SNMP notifications for OSPF Cisco-specific transition state changes.
snmp-server enable traps ospf errors	Enables SNMP notifications for OSPF errors.
snmp-server enable traps ospf lsa	Enables SNMP notifications for OSPF LSAs.
snmp-server enable traps ospf retransmit	Enables SNMP notifications for OSPF packet retransmissions.
snmp-server enable traps ospf state-change	Enables SNMP notifications for OSPF transition state changes.

snmp-server enable traps ospf retransmit

T o enable Simple Network Management Protocol (SNMP) notifications when packets are re-sent in an Open Shortest Path First (OSPF) network, use the snmp-server enable traps ospf retransmit command in global configuration mode. To disable SNMP notifications, use the no form of this command.

snmp-server enable traps ospf retransmit [packets] [virt-packets]

no snmp-server enable traps ospf retransmit [packets] [virt-packets]

Syntax Description


packets	(Optional) Enables only the ospfTxRetransmit trap. Allows SNMP notifications to be sent when an OSPF packet has been re-sent on a nonvirtual interface.
virt-packets	(Optional) Enables only the ospfVirtTxRetransmit trap. Allows SNMP notifications to be sent when an OSPF packet has been re-sent on a virtual interface.

Command Default

SNMP notifications are disabled.

Command Modes

Global configuration

Command History


Release	Modification
12.0(26)S	This command was introduced.
12.3(4)T	This command was integrated into Cisco IOS Release 12.3(4)T.
12.2(25)S	This command was integrated into Cisco IOS Release 12.2(25)S.
12.2(27)SBC	This command was integrated into Cisco IOS Release 12.2(27)SBC.
12.2(31)SB2	This command was integrated into Cisco IOS Release 12.2(31)SB2.

Usage Guidelines

To enable the ospfTXRetransmit trap so that SNMP notifications are sent only when packets from nonvirtual interfaces are re-sent, enter the snmp-server enable traps ospf retransmit command with the packets keyword. To enable the ospfTxRetransmit trap so that SNMP notifications are sent only when packets from virtual interfaces are re-sent, enter the snmp-server enable traps ospf retransmit command with the virt-packets keyword. When you enter the snmp-server enable traps ospf retransmit command without either keyword, both traps will be enabled.

Examples

The following example enables the router to send SNMP notifications when packets are re-sent by virtual interfaces:


Router(config)# snmp-server enable traps ospf retransmit virt-packets

Related Commands


Command	Description
snmp-server enable traps ospf	Enables all SNMP notifications for OSPF.
snmp-server enable traps ospf cisco-specific errors config-error	Enables SNMP notifications for OSPF nonvirtual interface mismatch errors.
snmp-server enable traps ospf cisco-specific lsa	Enables SNMP notifications for OSPF opaque LSAs.
snmp-server enable traps ospf cisco-specific retransmit	Enables SNMP notifications for OSPF Cisco-specific retransmission errors.
snmp-server enable traps ospf cisco-specific state-change	Enables SNMP notifications for OSPF Cisco-specific transition state changes.
snmp-server enable traps ospf errors	Enables SNMP notifications for OSPF errors.
snmp-server enable traps ospf lsa	Enables SNMP notifications for OSPF LSAs.
snmp-server enable traps ospf rate-limit	Limits the number of OSPF traps that are sent during a specified number of seconds.
snmp-server enable traps ospf state-change	Enables SNMP notifications for OSPF transition state changes.

snmp-server enable traps ospf state-change

T o enable Simple Network Management Protocol (SNMP) notifications for Open Shortest Path First (OSPF) transition state changes, use the snmp-server enable traps ospf state-change command in global configuration mode. To disable SNMP notifications for OSPF transition state changes, use the no form of this command.

snmp-server enable traps ospf state-change [if-state-change] [neighbor-state-change] [virtif-state-change] [virtneighbor-state-change]

no snmp-server enable traps ospf state-change [if-state-change] [neighbor-state-change] [virtif-state-change] [virtneighbor-state-change]

Syntax Description


if-state-change	(Optional) Enables only the ospfIfStateChange trap. Sends SNMP notifications when there has been a change in the state of a nonvirtual OSPF interface.
neighbor-state-change	(Optional) Enables only the ospfNbrStateChange trap. Sends SNMP notifications when there has been a change in the state of a nonvirtual OSPF neighbor.
virtif-state-change	(Optional) Enables only the ospfVirtIfStateChange trap. Sends SNMP notifications when there has been a change in the state of a virtual OSPF interface.
virtneighbor-state-change	(Optional) Enables only the ospfVirtNbrStateChange trap. Sends SNMP notifications when there has been a change in the state of a virtual OSPF neighbor.

Command Default

SNMP notifications for OSPF transition state changes are disabled.

Command Modes

Global configuration

Command History


Release	Modification
12.0(26)S	This command was introduced.
12.3(4)T	This command was integrated into Cisco IOS Release 12.3(4)T.
12.2(25)S	This command was integrated into Cisco IOS Release 12.2(25)S.
12.2(27)SBC	This command was integrated into Cisco IOS Release 12.2(27)SBC.

Usage Guidelines

To enable all traps for transition state changes, enter the snmp-server enable traps ospf state-change command without of the optional keywords.

Examples

The following example enables the router to send SNMP notifications for transition state changes for virtual interfaces and virtual neighbors:


Router(config)# snmp-server enable traps ospf state-change virtif-state-change virtneighbor-state-change

Related Commands


Command	Description
snmp-server enable traps ospf	Enables all SNMP notifications for OSPF.
snmp-server enable traps ospf cisco-specific errors config-error	Enables SNMP notifications for OSPF nonvirtual interface mismatch errors.
snmp-server enable traps ospf cisco-specific lsa	Enables SNMP notifications for OSPF opaque LSAs.
snmp-server enable traps ospf cisco-specific retransmit	Enables SNMP notifications for OSPF Cisco-specific retransmission errors.
snmp-server enable traps ospf cisco-specific state-change	Enables SNMP notifications for OSPF Cisco-specific transition state changes.
snmp-server enable traps ospf errors	Enables SNMP notifications for OSPF errors.
snmp-server enable traps ospf lsa	Enables SNMP notifications for OSPF LSAs.
snmp-server enable traps ospf rate-limit	Limits the number of OSPF traps that are sent during a specified number of seconds.
snmp-server enable traps ospf retransmit	Enables SNMP notifications for OSPF packet retransmissions.

snmp-server snmp traps ospfv3 errors

To enable Simple Network Management Protocol (SNMP) notifications for Open Shortest Path First version 3 (OSPFv3) errors, use the snmp-server enable traps ospfv3 errors command in global configuration mode. To disable SNMP notifications for OSPFv3 errors, use the no form of this command.

snmp-server enable traps ospfv3 errors [bad-packet] [config-error] [virt-bad-packet] [virt-config-error]

no snmp-server enable traps ospfv3 errors [bad-packet] [config-error] [virt-bad-packet] [virt-config-error]

Syntax Description


bad-packet	(Optional) Enables SNMP notifications to be sent when an OSPFv3 packet that could not be parsed has been received on a nonvirtual interface.
config-error	(Optional) Enables SNMP notifications when a packet has been received in a nonvirtual interface from a neighbor router whose configuration parameters conflict with the configuration parameters of this router.
virt-bad-packet	(Optional) Enables SNMP notifications to be sent when an OSPFv3 packet that could not be parsed has been received on a virtual interface.
virt-config-error	(Optional) Enables SNMP notifications when a packet has been received in a virtual interface from a neighbor router whose configuration parameters conflict with the configuration parameters of this router.

Command Default

SNMP notifications for OSPFv3 errors are disabled.

Command Modes

Global configuration (config)

Command History


Release	Modification
15.2(4)M	This command was introduced.
15.2(4)S	This command was integrated into Cisco IOS Release 15.2(4)S.
Cisco IOS XE Release 3.7S	This command was integrated into Cisco IOS XE Release 3.7S.

Usage Guidelines

When you enter the snmp-server enable traps ospfv3 errors command without any optional keywords, all OSPFv3 error traps will be enabled. To enable only one or more OSPFv3 error traps, enter one or more of the optional keywords.

Examples

The following example enables the router to send all OSPFv3 error notifications:


Router(config)# snmp-server enable traps ospfv3 errors

Related Commands


Command	Description
snmp-server enable traps ospfv3 rate-limit	Limits the number of OSPFv3 traps that are sent during a specified number of seconds.
snmp-server enable traps ospfv3 state-change	Enables SNMP notifications for OSPFv3 transition state changes.

snmp-server snmp traps ospfv3 rate-limit

To limit the number of Open Shortest Path First Version 3 (OSPFv3) traps that are sent during a specified number of seconds, use the snmp-server enable traps ospfv3 rate-limit command in global configuration mode. To disable the limit placed on the number of OSPF traps sent during a specified number of seconds, use the no form of this command.

snmp-server enable traps ospfv3 rate-limit seconds trap-number

no snmp-server enable traps ospfv3 rate-limit

Syntax Description


`seconds`	Sets the rate limit window size, in seconds. The range is from 2 to 60. The default value is 10.
`trap-number`	Sets the maximum number of traps sent during the window time. The range is from 0 to 300. The default number is 7.

Command Default

No limit is placed on the number of OSPFv3 traps sent.

Command Modes

Global configuration (config)

Command History


Release	Modification
15.2(4)M	This command was introduced.
15.2(4)S	This command was integrated into Cisco IOS Release 15.2(4)S.
Cisco IOS XE Release 3.7S	This command was integrated into Cisco IOS XE Release 3.7S.

Usage Guidelines

There is a possibility that a router sends trap bursts, which can drain network resources in a small interval of time. We recommend that you enter the snmp-server enable traps ospfv3 rate-limit command to configure a sliding window mechanism that will limit the number of traps that are sent within a specified number of seconds.

Examples

The following example sets the trap rate limit window so that during a 40-second window of time, no more than 50 traps are sent.


Router(config)# snmp-server enable traps ospfv3 rate-limit 40 50

Related Commands


Command	Description
snmp-server enable traps ospfv3 errors	Enables SNMP notifications for OSPFv3 errors.
snmp-server enable traps ospfv3 state-change	Enables SNMP notifications for OSPFv3 transition state changes.

snmp-server snmp traps ospfv3 state-change

To enable Simple Network Management Protocol (SNMP) notifications for Open Shortest Path First Version 3 (OSPFv3) transition state changes, use the snmp-server enable traps ospfv3 state-change command in global configuration mode. To disable SNMP notifications for OSPFv3 transition state changes, use the no form of this command.

snmp-server enable traps ospfv3 state-change [if-state-change] [neighbor-restart-helper-status-change] [neighbor-state-change] [nssa-translator-status-change] [restart-status-change] [virtif-state-change] [virtneighbor-restart-helper-status-change] [virtneighbor-state-change]

no snmp-server enable traps ospfv3 state-change [if-state-change] [neighbor-restart-helper-status-change] [neighbor-state-change] [nssa-translator-status-change] [restart-status-change] [virtif-state-change] [virtneighbor-restart-helper-status-change] [virtneighbor-state-change]

Syntax Description


if-state-change	(Optional) Enables SNMP notifications when there has been a change in the state of a nonvirtual OSPFv3 interface.
neighbor-restart-helper-status-change	(Optional) Enables SNMP notifications when there has been a change in the status of a neighbor graceful restart helper.
neighbor-state-change	(Optional) Enables SNMP notifications when there has been a change in the state of a nonvirtual OSPFv3 neighbor.
nssa-translator-status-change	(Optional) Enables SNMP notifications when there has been a change in the status of a NSSA translator.
restart-status-change	(Optional) Enables SNMP notifications when there has been a change in the graceful restart status.
virtif-state-change	(Optional) SNMP notifications when there has been a change in the state of a virtual OSPFv3 interface.
virtneighbor-restart-helper-status-change	(Optional) Enables SNMP notifications when there has been a change in the status of a virtual OSPFv3 neighbor restart helper.
virtneighbor-state-change	(Optional) Enables SNMP notifications when there has been a change in the state of a virtual OSPFv3 neighbor.

Command Default

SNMP notifications for OSPFv3 transition state changes are disabled.

Command Modes

Global configuration (config)

Command History


Release	Modification
15.2(4)M	This command was introduced.
15.2(4)S	This command was integrated into Cisco IOS Release 15.2(4)S.
Cisco IOS XE Release 3.7S	This command was integrated into Cisco IOS XE Release 3.7S.

Usage Guidelines

To enable all traps for transition state changes, enter the snmp-server enable traps ospfv3 state-change command without any of the optional keywords.

Examples

The following example enables the router to send SNMP notifications for all transition state changes:


Router(config)# snmp-server enable traps ospfv3 state-change

Related Commands


Command	Description
snmp-server enable traps ospfv3 errors	Enables SNMP notifications for OSPFv3 errors.
snmp-server enable traps ospfv3 rate-limit	Limits the number of OSPFv3 traps that are sent during a specified number of seconds.

summary-address (OSPF)

To create aggregate addresses for Open Shortest Path First (OSPF), use the summary-address command in router configuration mode. To restore the default, use the no form of this command.

summary-address commandsummary-address {ip-address mask | prefix mask} [not-advertise] [tag tag] [nssa-only]

no summary-address {ip-address mask | prefix mask} [not-advertise] [tag tag] [nssa-only]

Syntax Description


`ip-address`	Summary address designated for a range of addresses.
`mask`	IP subnet mask used for the summary route.
`prefix`	IP route prefix for the destination.
not-advertise	(Optional) Suppresses routes that match the specified prefix/mask pair. This keyword applies to OSPF only.
tag `tag`	(Optional) Specifies the tag value that can be used as a “match” value for controlling redistribution via route maps. This keyword applies to OSPF only.
nssa-only	(Optional) Sets the nssa-only attribute for the summary route (if any) generated for the specified prefix, which limits the summary to not-so-stubby-area (NSSA) areas.

Command Default

This command behavior is disabled by default.

Command Modes

Router configuration

Command History


Release	Modification
10.0	This command was introduced.
12.2(33)SRA	This command was integrated into Cisco IOS Release 12.2(33)SRA.
12.2SX	This command is supported in the Cisco IOS Release 12.2SX train. Support in a specific 12.2SX release of this train depends on your feature set, platform, and platform hardware.
15.0(1)M	This command was modified. The nssa-only keyword was added.

Usage Guidelines

R outes learned from other routing protocols can be summarized. The metric used to advertise the summary is the lowest metric of all the more specific routes. This command helps reduce the size of the routing table.

Using this command for OSPF causes an OSPF Autonomous System Boundary Router (ASBR) to advertise one external route as an aggregate for all redistributed routes that are covered by the address. For OSPF, this command summarizes only routes from other routing protocols that are being redistributed into OSPF. Use the area range command for route summarization between OSPF areas.

OSPF does not support the summary-address 0.0.0.0 0.0.0.0 command.

Examples

In the following example, the summary address 10.1.0.0 includes address 10.1.1.0, 10.1.2.0, 10.1.3.0, and so on. Only the address 10.1.0.0 is advertised in an external link-state advertisement.


summary-address 10.1.0.0 255.255.0.0

Related Commands


Command	Description
area range	Consolidates and summarizes routes at an area boundary.
ip ospf authentication-key	Assigns a password to be used by neighboring routers that are using the simple password authentication of OSPF.
ip ospf message-digest-key	Enables OSPF MD5 authentication.

timers lsa arrival

To set the minimum interval at which the software accepts the same link-state advertisement (LSA) from Open Shortest Path First (OSPF) neighbors, use the timers lsa arrival command in router configuration mode. To restore the default value, use the no form of this command.

timers lsa arrival milliseconds

no timers lsa arrival

Syntax Description


`milliseconds`	Minimum delay in milliseconds that must pass between acceptance of the same LSA arriving from neighbors. The range is from 0 to 600,000 milliseconds. The default is 1000 milliseconds.

Command Default

1000 milliseconds

Command Modes

OSPF for IPv6 router configuration (config-rtr) Router configuration (config-router)

Command History


Release	Modification
12.0(25)S	This command was introduced.
12.2(27)SBC	This command was integrated into Cisco IOS Release 12.2(27)SBC.
12.2(33)SRA	This command was integrated into Cisco IOS Release 12.2(33)SRA.
12.2SX	This command is supported in the Cisco IOS Release 12.2SX train. Support in a specific 12.2SX release of this train depends on your feature set, platform, and platform hardware.
12.2(33)SRC	Support for IPv6 was added.
12.2(33)SB	Support for IPv6 was added.
Cisco IOS XE Release 2.1	This command was introduced on Cisco ASR 1000 Series Routers.
15.0(1)M	This command was integrated into Cisco IOS Release 12.5(1)M.
12.2(33)XNE	This command was modified. It was integrated into Cisco IOS Release 12.2(33)XNE.

Usage Guidelines

The timers lsa arrival command controls the minimum interval for accepting the same LSA. The “same LSA” is defined as an LSA instance that contains the same LSA ID number, LSA type, and advertising router ID. If an instance of the same LSA arrives sooner than the interval that is set, the LSA is dropped.

We suggest you keep the milliseconds value of the timers lsa arrival command less than or equal to the neighbors’ hold-interval value of the timers throttle lsa all command.

Examples

The following example sets the minimum interval for accepting the same LSA at 2000 milliseconds:


router ospf 1
 log-adjacency-changes
 timers throttle lsa all 200 10000 45000
 timers lsa arrival 2000
 network 10.10.4.0 0.0.0.255 area 24
 network 10.10.24.0 0.0.0.255 area 24

Related Commands


Command	Description
show ip ospf timers rate-limit	Displays all of the LSAs in the rate limit queue.
show ipv6 ospf timers rate-limit	Displays all of the LSAs in the IPv6 rate limit queue
timers throttle lsa	Sets rate-limiting values for OSPF for IPv6 LSA generation.
timers throttle lsa all	Sets rate-limiting values for LSAs being generated.

timers pacing flood

To configure link-state advertis ement (LSA) flood packet pacing, use the timers pacing flood command in router configuration mode. To restore the default flood packet pacing value, use the no form of this command.

timers pacing flood milliseconds

no timers pacing flood

Syntax Description


`milliseconds`	Time (in milliseconds) at which LSAs in the flooding queue are paced in between updates. The configurable range is from 5 milliseconds to 100 milliseconds. The default value is 33 milliseconds.

Command Default

33 milliseconds

Command Modes

Router configuration

Command History


Release	Modification
12.2(4)T	This command was introduced.
12.2(14)S	This command was integrated into Cisco IOS Release 12.2(14)S.
12.2(33)SRA	This command was integrated into Cisco IOS Release 12.2(33)SRA.
12.2SX	This command is supported in the Cisco IOS Release 12.2SX train. Support in a specific 12.2SX release of this train depends on your feature set, platform, and platform hardware.

Usage Guidelines

Configuring Open Shortest Path First (OSPF) flood pacing timers allows you to control interpacket spacing between consecutive link-state update packets in the OSPF transmission queue. This command allows you to control the rate at which LSA updates occur so that high CPU or buffer utilization that can occur when an area is flooded with a very large number of LSAs can be reduced.

The default settings for OSPF packet pacing timers are suitable for the majority of OSPF deployments. Do not change the packet pacing timers unless all other options to meet OSPF packet flooding requirements have been exhausted. Specifically, network operators should prefer summarization, stub area usage, queue tuning, and buffer tuning before changing the default flood timers. Furthermore, there are no guidelines for changing timer values; each OSPF deployment is unique and should be considered on a case-by-case basis. The network operator assumes risks associated with changing the default flood timer values.

Examples

The following example configures LSA flood packet-pacing updates to occur in 55-millisecond intervals for Open Shortest Path First (OSPF) routing process 1:


Router(config)# router ospf 1
Router(config-router)# timers pacing flood 55

Related Commands


Command	Description
show ip ospf	Displays general information about OSPF routing processes.
timers pacing lsa-group	Changes the interval at which OSPF LSAs are collected into a group and refreshed, checksummed, or aged.
timers pacing retransmission	Configures LSA retransmission packet pacing.

timers pacing lsa-group

To change th e interval at which Open Shortest Path First ( OSPF) link-state advertisements (LSAs) are collected into a group and refreshed, checksummed, or aged, use the timers pacing lsa-group command in router configuration mode. To restore the default value, use the no form of this command.

timers pacing lsa-group seconds

no timers pacing lsa-group

Syntax Description


`seconds`	Number of seconds in the interval at which LSAs are grouped and refreshed, checksummed, or aged. The range is from 10 to 1800 seconds. The default value is 240 seconds.

Command Default

The default interval for this command is 240 seconds. OSPF LSA group pacing is enabled by default.

Command Modes

Router configuration

Command History


Release	Modification
11.3AA	This command was introduced.
12.2(4)T	The syntax of this command was changed from timers lsa-group-pacing to timers pacing lsa-group.
12.2(14)S	This command was integrated into Cisco IOS Release 12.2(14)S.
12.2(33)SRA	This command was integrated into Cisco IOS Release 12.2(33)SRA.
12.2SX	This command is supported in the Cisco IOS Release 12.2SX train. Support in a specific 12.2SX release of this train depends on your feature set, platform, and platform hardware.

Usage Guidelines

This command allows you to control the rate at which LSA updates occur so that high CPU or buffer utilization that can occur when an area is flooded with a very large number of LSAs can be reduced. The default settings for OSPF packet pacing timers are suitable for the majority of OSPF deployments. Do not change the packet pacing timers unless all other options to meet OSPF packet flooding requirements have been exhausted. Specifically, network operators should prefer summarization, stub area usage, queue tuning, and buffer tuning before changing the default flooding timers. Furthermore, there are no guidelines for changing timer values; each OSPF deployment is unique and should be considered on a case-by-case basis. The network operator assumes the risks associated with changing the default timer values.

Cisco IOS software groups the periodic refresh of LSAs to improve the LSA packing density for the refreshes in large topologies. The group timer controls the interval used for group refreshment of LSAs; however, this timer does not change the frequency that individual LSAs are refreshed (the default refresh rate is every 30 minutes).

The duration of the LSA group pacing is inversely proportional to the number of LSAs the router is handling. For example, if you have about 10,000 LSAs, decreasing the pacing interval would benefit you. If you have a very small database (40 to 100 LSAs), increasing the pacing interval to 10 to 20 minutes might benefit you slightly.

Examples

The following example configures OSPF group packet-pacing updates between LSA groups to occur in 60-second intervals for OSPF routing process 1:


Router(config)# router ospf 1
Router(config-router)# timers pacing lsa-group 60

Related Commands


Command	Description
show ip ospf	Displays general information about OSPF routing processes.
timers pacing flood	Configures LSA flood packet pacing.
timers pacing retransmission	Configures LSA retransmission packet pacing.

timers pacing retransmission

To configure link-state adv ertisement (LSA) retransmission packet pacing, use the timers pacing retransmission command in router configuration mode. To restore the default retransmission packet pacing value, use the no form of this command.

timers pacing retransmission milliseconds

no timers pacing retransmission

Syntax Description


`milliseconds`	The time (in milliseconds) at which LSAs in the retransmission queue are paced. The configurable range is from 5 milliseconds to 200 milliseconds. The default value is 66 milliseconds.

Command Default

66 milliseconds

Command Modes

Router configuration

Command History


Release	Modification
12.2(4)T	This command was introduced.
12.2(14)S	This command was integrated into Cisco IOS Release 12.2(14)S.
12.2(33)SRA	This command was integrated into Cisco IOS Release 12.2(33)SRA.
12.2SX	This command is supported in the Cisco IOS Release 12.2SX train. Support in a specific 12.2SX release of this train depends on your feature set, platform, and platform hardware.

Usage Guidelines

Configuring Open Shortest Path First (OSPF) retransmission pacing timers allow you to control interpacket spacing between consecutive link-state update packets in the OSPF retransmission queue. This command allows you to control the rate at which LSA updates occur so that high CPU or buffer utilization that can occur when an area is flooded with a very large number of LSAs can be reduced. The default settings for OSPF packet retransmission pacing timers are suitable for the majority of OSPF deployments. Do not change the packet retransmission pacing timers unless all other options to meet OSPF packet flooding requirements have been exhausted. Specifically, network operators should prefer summarization, stub area usage, queue tuning, and buffer tuning before changing the default flooding timers. Furthermore, there are no guidelines for changing timer values; each OSPF deployment is unique and should be considered on a case-by-case basis. The network operator assumes risks associated with changing the default packet retransmission pacing timer values.

Examples

The following example configures LSA flood pacing updates to occur in 55-millisecond intervals for OSPF routing process 1:


Router(config)# router ospf 1
Router(config-router)# timers pacing retransmission 55

Related Commands


Command	Description
show ip ospf	Displays general information about OSPF routing processes.
timers pacing flood	Configures LSA flood packet pacing.
timers pacing lsa-group	Changes the interval at which OSPF LSAs are collected into a group and refreshed, checksummed, or aged.

timers throttle lsa all

To set rate-limiting values for all types of Open Shortest Path First (OSPF) link-state advertisement (LSA) generation, use the timers throttle lsa all command in router configuration mode. To restore the default values, use the no form of this command.

timers throttle lsa all start-interval hold-interval max-interval

no timers throttle lsa all

Syntax Description


`start-interval`	Minimum delay in milliseconds for the generation of LSAs. The first instance of LSA is always generated immediately upon a local OSPF topology change. The generation of the next LSA is not before the start interval. The range is 0 to 600,000 milliseconds. The default is 0 milliseconds, which means no delay; the LSA is sent immediately.
`hold-interval`	Incremental time in milliseconds. This value is used to calculate the subsequent rate limiting times for LSA generation. The range is 1 to 600,000 milliseconds. The default value is 5000 milliseconds.
`max-interval`	Maximum wait time in milliseconds between generation of the same LSA. The range is 1 to 600,000 milliseconds. The default value is 5000 milliseconds.

Command Default

start-interval : 0 millisecondshold-interval: 5000 millisecondsmax-interval : 5000 milliseconds

Command Modes

Router configuration (config router)

Command History


Release	Modification
12.0(25)S	This command was introduced.
12.3(2)T	This command was integrated into Cisco IOS Release 12.3(2)T.
12.2SX	This command is supported in the Cisco IOS Release 12.2SX train. Support in a specific 12.2SX release of this train depends on your feature set, platform, and platform hardware.

Usage Guidelines

The “same LSA” is defined as an LSA instance that contains the same LSA ID number, LSA type, and advertising router ID. We suggest you keep the milliseconds value of the timers lsa arrival command less than or equal to the hold-interval value of the timers throttle lsa all command.

Examples

This example customizes OSPF LSA throttling so that the start interval is 200 milliseconds, the hold interval is 10,000 milliseconds, and the maximum interval is 45,000 milliseconds. The minimum interval between instances of receiving the same LSA is 2000 milliseconds.


router ospf 1
 log-adjacency-changes
 timers throttle lsa all 200 10000 45000
 timers lsa arrival 2000
 network 10.10.4.0 0.0.0.255 area 24
 network 10.10.24.0 0.0.0.255 area 24

Related Commands


Command	Description
show ip ospf	Displays information about OSPF routing processes.
timers lsa arrival	Sets the minimum interval at which the software accepts the same LSA from OSPF neighbors.

timers throttle spf

To turn on Open Shortest Path First ( OSPF) shortest path first (SPF) throttling, use the timers throttle spf command in the appropriate configuration mode. To turn off OSPF SPF throttling, use the no form of this command.

timers throttle spf spf-start spf-hold spf-max-wait

no timers throttle spf spf-start spf-hold spf-max-wait

Syntax Description


`spf-start`	Initial delay to schedule an SPF calculation after a change, in milliseconds. Range is from 1 to 600000. In OSPF for IPv6, the default value is 5000.
`spf-hold`	Minimum hold time between two consecutive SPF calculations, in milliseconds. Range is from 1 to 600000. In OSPF for IPv6, the default value is 10,000.
`spf-max-wait`	Maximum wait time between two consecutive SPF calculations, in milliseconds. Range is from 1 to 600000. In OSPF for IPv6, the default value is 10,000.

Command Default

SPF throttling is not set.

Command Modes

Address family configuration (config-router-af) Router address family topology configuration (config-router-af-topology) Router configuration (config-router) OSPF for IPv6 router configuration (config-rtr)

Command History


Release	Modification
12.2(14)S	This command was introduced. This command replaces the timers spf-interval command.
12.0(23)S	This command was integrated into Cisco IOS Release 12.0(23)S.
12.2(15)T	This command was integrated into Cisco IOS Release 12.2(15)T.
12.2(33)SRA	This command was integrated into Cisco IOS Release 12.2(33)SRA.
12.2(33)SRB	This command was made available in router address family configuration mode.
12.2SX	This command is supported in the Cisco IOS Release 12.2SX train. Support in a specific 12.2SX release of this train depends on your feature set, platform, and platform hardware.
12.2(33)SRC	Support for IPv6 was added.
12.2(33)SB	Support for IPv6 was added and this command was integrated into Cisco IOS Release 12.2(33)SB.
Cisco IOS XE Release 2.1	This command was introduced on Cisco ASR 1000 Series Routers.
15.0(1)M	This command was integrated into Cisco IOS Release 12.5(1)M.
12.2(33)XNE	This command was modified. It was integrated into Cisco IOS Release 12.2(33)XNE.
15.1(1)SY	This command was integrated into Cisco IOS Release 15.1(1)SY.

Usage Guidelines

The first wait interval between SPF calculations is the amount of time in milliseconds specified by the spf-start argument. Each consecutive wait interval is two times the current hold level in milliseconds until the wait time reaches the maximum time in milliseconds as specified by the spf-max-wait argument. Subsequent wait times remain at the maximum until the values are reset or a link-state advertisement (LSA) is received between SPF calculations.

Release 12.2(33)SRB

If you plan to configure the Multi-Topology Routing (MTR) feature, you need to enter the timers throttle spf command in router address family topology configuration mode in order to make this OSPF router configuration command become topology-aware.

Release 15.2(1)T

When you configure the ospfv3 network manet command on any interface attached to the OSPFv3 process, the default values for the spf-start , spf-hold , and the spf-max-wait arguments are reduced to 1000 milliseconds, 1000 milliseconds, and 2000 milliseconds respectively.

Examples

The following example shows how to configure a router with the delay, hold, and maximum interval values for the timers throttle spf command set at 5, 1000, and 90,000 milliseconds, respectively.


router ospf 1
 router-id 10.10.10.2
 log-adjacency-changes
 timers throttle spf 5 1000 90000 
 redistribute static subnets
 network 10.21.21.0 0.0.0.255 area 0
 network 10.22.22.0 0.0.0.255 area 00

The following example shows how to configure a router using IPv6 with the delay, hold, and maximum interval values for the timers throttle spf command set at 500, 1000, and 10,000 milliseconds, respectively.


ipv6 router ospf 1 
 event-log size 10000 one-shot
 log-adjacency-changes  
 timers throttle spf 500 1000 10000

Related Commands


Command	Description
ospfv3 network manet	Sets the network type to Mobile Ad Hoc Network (MANET).

ttl-security all-interfaces

To enable Time-to-Live (TTL) security check on all OSPF interfaces, use the ttl-security all-interfaces command in interface configuration mode. To disable TTL security check, use the no form of this command.

ttl-security all-interfaces [hops hop-count]

no ttl-security all-interfaces

Syntax Description


hops `hop-count`	(Optional) Configures the maximum number of IP hops allowed. The `hop-count` argument range is from 1 to 254.

Command Default

TTL security check is disabled on OSPF interfaces.

Command Modes

Interface configuration (config-if)

Command History


Release	Modification
12.2(33)SRC	This command was introduced.
15.0(1)M	This command was integrated into Cisco IOS Release 15.0(1)M.

Usage Guidelines

Use the ttl-security all-interfaces command to enable TTL security check on all OSPF interfaces.

This command applies only to normal OSPF interfaces. It does not apply to virtual or sham links that require TTL security protection. Virtual and sham links must be configured independently.

As a convenience, this command can be used to globally enable TTL security check on all OSPF interfaces. Then the ip ospf ttl-security disable command in interface configuration mode can be used to disable TTL security on an interface-by-interface basis.

Examples

The following example shows how to enable TTL security check on all OSPF interfaces:


Router(config
)
# router ospf 1
Router(config-router
)
# ttl-security all-interfaces

Related Commands


Command	Description
ip ospf ttl-security	Configures TTL security check on a specific interface.

Bias-Free Language

Results

Chapter: OSPF Commands: show ip ospf through T

OSPF Commands: show ip ospf through T

show ip ospf

Syntax Description

Command Modes

Command History

Examples

Examples

show ip ospf border-routers

Syntax Description

Command Modes

Command History

Examples

show ip ospf database

Syntax Description

Command Modes

Command History

Usage Guidelines

Examples

show ip ospf events

Syntax Description

Command Modes

Command History

Examples

show ip ospf fast-reroute

Syntax Description

Command Modes

Command History

Usage Guidelines

Examples

Related Commands

show ip ospf flood-list

Syntax Description

Command Modes

Command History

Usage Guidelines

Examples

show ip ospf interface

Syntax Description

Command Modes

Command History

Examples

show ip ospf max-metric

Syntax Description

Command Modes

Command History

Examples

show ip ospf multi–area

Syntax Description

Command Default

Command Modes

Command History

Examples

Related Commands

show ip ospf neighbor

Syntax Description

Command Modes

Command History

Examples

Examples

show ip ospf nsf

Syntax Description

Command Modes

Command History

Examples

show ip ospf nsr

Syntax Description

Command Modes

Command History

Examples

Related Commands

show ip ospf request-list

Syntax Description

Command Modes

Command History

Usage Guidelines

Examples