- Index
- Preface
- Product Overview
- Command-Line Interfaces
- Smart Port Macros
- Virtual Switching Systems (VSS)
- Enhanced Fast Software Ugrade (eFSU)
- NSF with SSO Supervisor Engine Redundancy
- RPR Supervisor Engine Redundancy
- Interface Configuration
- UniDirectional Link Detection (UDLD)
- Power Management and Environmental Monitoring
- EnergyWise
- Online Diagnostics
- Onboard Failure Logging
- Switch Fabric Functionality
- Cisco IP Phone Support
- Power over Ethernet
- Layer 2 LAN Ports
- Flex Links
- EtherChannels
- mLACP for Server Access
- IEEE 802.1ak MVRP and MRP
- VLAN Trunking Protocol (VTP)
- VLANs
- Private VLANs (PVLANs)
- Private Hosts
- IEEE 802.1Q Tunneling
- Layer 2 Protocol Tunneling
- STP and MST
- Optional STP Features
- Layer 3 Interface Configuration
- Unidirectional Ethernet (UDE) and unidirectional link routing (UDLR)
- Multiprotocol Label Switching (MPLS)
- L2VPN Advanced VPLS (A-VPLS)
- IP Unicast Layer 3 Switching
- IPv6 Multicast Layer 3 Switching
- MLD Snooping for IPv6 Multicast Traffic
- IPv4 Multicast Layer 3 Switching
- IGMP Snooping and MVR for IPv4 Multicast Traffic
- Configuring MVR for IPv4 Multicast Traffic
- IPv4 IGMP Filtering and Router Guard
- PIM Snooping
- IPv4 Multicast VPN Support
- PFC QoS
- AutoQoS
- MPLS QoS
- PFC QoS Statistics Data Export
- Network Security
- AutoSecure
- Cisco IOS ACL Support
- Cisco TrustSec (CTS)
- Port ACLs (PACLs) and VLAN ACLs (VACLs)
- Denial of Service Protection
- Control Plane Policing (CoPP)
- DHCP Snooping
- IP Source Guard
- Dynamic ARP Inspection
- Traffic Storm Control
- Unknown Unicast and Multicast Flood Control
- Network Admission Control (NAC)
- IEEE 802.1X Port-Based Authentication
- Web-Based Authentication
- Port Security
- NetFlow
- NetFlow Data Export (NDE)
- Call Home
- System Event Archive (SEA)
- Backplane Platform Monitoring
- SPAN, RSPAN, and ERSPAN
- SNMP IfIndex Persistence
- Top-N Reports
- Layer 2 Traceroute Utility
- Mini Protocol Analyzer
- Ethernet Services Line Cards
- Online Diagnostic Tests
- Acronyms
Configuring SNMP IfIndex Persistence
This chapter describes how to configure the SNMP ifIndex persistence feature in Cisco IOS Release 12.2SX.
Note For complete syntax and usage information for the commands used in this chapter, see the Cisco IOS Master Command List, at this URL:
http://www.cisco.com/en/US/docs/ios/mcl/allreleasemcl/all_book.html
Tip For additional information about Cisco Catalyst 6500 Series Switches (including configuration examples and troubleshooting information), see the documents listed on this page:
http://www.cisco.com/en/US/products/hw/switches/ps708/tsd_products_support_series_home.html
Participate in the Technical Documentation Ideas forum
This chapter consists of these sections:
•Understanding SNMP IfIndex Persistence
•Configuring SNMP IfIndex Persistence
Understanding SNMP IfIndex Persistence
The SNMP ifIndex persistence feature provides an interface index (ifIndex) value that is retained and used when the switch reboots. The ifIndex value is a unique identifying number associated with a physical or logical interface.
There is no requirement in the relevant RFCs that the correspondence between particular ifIndex values and their interfaces be maintained when the switch reboots, but many applications (for example, device inventory, billing, and fault detection) require maintenance of this correspondence.
You can poll the switch at regular intervals to correlate the interfaces to the ifIndexes, but it is not practical to poll constantly. The SNMP ifIndex persistence feature provides permanent ifIndex values, which eliminates the need to poll interfaces.
The following definitions are based on RFC 2233, "The Interfaces Group MIB using SMIv2." The following terms are values in the Interfaces MIB (IF-MIB):
•ifIndex —A unique number (greater than zero) that identifies each interface for SNMP identification of that interface.
•ifName—The text-based name of the interface, for example, "ethernet 3/1."
•ifDescr—A description of the interface. Recommended information for this description includes the name of the manufacturer, the product name, and the version of the interface hardware and software.
Configuring SNMP IfIndex Persistence
These sections describe how to configure SNMP ifIndex persistence:
•Enabling SNMP IfIndex Persistence Globally (Optional)
•Enabling and Disabling SNMP IfIndex Persistence on Specific Interfaces (Optional)
Note To verify that ifIndex commands have been configured, use the more system:running-config command.
Enabling SNMP IfIndex Persistence Globally
SNMP ifIndex persistence is disabled by default. To globally enableSNMP ifIndex persistence, perform this task:
|
|
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Router(config)# snmp-server ifindex persist |
Globally enables SNMP ifIndex persistence. |
In the following example, SNMP ifIndex persistence is enabled for all interfaces:
router(config)# snmp-server ifindex persist
Disabling SNMP IfIndex Persistence Globally
To globally disable SNMP ifIndex persistence after enabling it, perform this task:
|
|
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Router(config)# no snmp-server ifindex persist |
Globally disables SNMP ifIndex persistence. |
In the following example, SNMP ifIndex persistence is disabled for all interfaces:
router(config)# no snmp-server ifindex persist
Enabling and Disabling SNMP IfIndex Persistence on Specific Interfaces
To enable SNMP ifIndex persistence only on a specific interface, perform this task:
|
|
|
---|---|---|
Step 1 |
Router(config)# interface {vlan vlan_ID} | {type1 slot/port} | {port-channel port_channel_number} |
Selects an interface to configure. |
Step 2 |
Router(config-if)# snmp ifindex persist |
Enables SNMP ifIndex persistence on the specified interface. |
Step 3 |
Router(config-if)# |
Exits interface configuration mode. |
1 type = any supported interface type. |
Note The [no] snmp ifindex persistence interface command cannot be used on subinterfaces. A command applied to an interface is automatically applied to all the subinterfaces associated with that interface.
In the following example, SNMP ifIndex persistence is enabled for Ethernet interface 3/1 only:
router(config)# interface ethernet 3/1
router(config-if)# snmp ifindex persist
router(config-if)# exit
In the following example, SNMP ifIndex persistence is disabled for Ethernet interface 3/1 only:
router(config)# interface ethernet 3/1
router(config-if)# no snmp ifindex persist
router(config-if)# exit
Clearing SNMP IfIndex Persistence Configuration from a Specific Interface
To clear the interface-specific SNMP ifIndex persistence setting and configure the interface to use the global configuration setting, perform this task:
In the following example, any previous setting for SNMP ifIndex persistence on Ethernet interface 3/1 is removed from the configuration. If SNMP ifIndex persistence is globally enabled, SNMP ifIndex persistence will be enabled for Ethernet interface 3/1. If SNMP ifIndex persistence is globally disabled, SNMP ifIndex persistence will be disabled for Ethernet interface 3/1.
router(config)# interface ethernet 3/1
router(config-if)# snmp ifindex clear
router(config-if)# exit
Tip For additional information about Cisco Catalyst 6500 Series Switches (including configuration examples and troubleshooting information), see the documents listed on this page:
http://www.cisco.com/en/US/products/hw/switches/ps708/tsd_products_support_series_home.html
Participate in the Technical Documentation Ideas forum