Dit document toont hoe Open Snelst Path First (OSPF) een Not So Stubby Area (NSSA) type 7 link-state advertentie (LSA) converteert naar een type 5 LSA.
Er zijn geen specifieke vereisten van toepassing op dit document.
Dit document is niet beperkt tot specifieke software- en hardware-versies.
Deze sectie bevat informatie over het configureren van de functies die in dit document worden beschreven.
N.B.: Als u aanvullende informatie wilt vinden over de opdrachten in dit document, gebruikt u het Opdrachtplanningprogramma (alleen geregistreerd klanten).
Dit document gebruikt de netwerkinstellingen die in dit diagram worden weergegeven.
Dit document gebruikt de configuraties die hier worden weergegeven.
router 1.1.1.1 |
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Current configuration: hostname r1.1.1.1 interface Loopback0 ip address 1.1.1.1 255.0.0.0 interface Serial2/1/0 ip address 5.0.0.1 255.0.0.0 interface Ethernet2/0/0 ip address 4.0.0.1 255.0.0.0 router ospf 4 redistribute static metric 5 metric-type 1 network 5.0.0.0 0.255.255.255 area 1 network 4.0.0.0 0.255.255.255 area 1 area 1 nssa ip route 9.0.0.0 255.0.0.0 4.0.0.2 end |
router 2.2.2.2 |
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Current configuration: hostname r2.2.2.2 interface Loopback0 ip address 2.2.2.2 255.0.0.0 interface Serial0/1/0 ip address 5.0.0.2 255.0.0.0 interface ATM1/0.20 ip address 6.0.0.2 255.0.0.0 router ospf 2 network 5.0.0.0 0.255.255.255 area 1 network 6.0.0.0 0.255.255.255 area 0 area 1 nssa end |
router 3.3.3.3 |
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Current configuration: hostname r3.3.3.3 interface Loopback0 ip address 3.3.3.3 255.0.0.0 interface ATM2/0.20 point-to-point ip address 6.0.0.3 255.0.0.0 router ospf 2 network 6.0.0.0 0.255.255.255 area 0 end |
Deze sectie verschaft informatie die u kunt gebruiken om te bevestigen dat uw configuratie correct werkt.
Bepaalde opdrachten met show worden ondersteund door de tool Output Interpreter (alleen voor geregistreerde klanten). Hiermee kunt u een analyse van de output van opdrachten met show genereren.
ip ospf database-hiermee wordt een lijst van LSA's weergegeven en typt ze in een database van de verbindingsstaat. Deze lijst geeft alleen de informatie in de LSA header weer.
Toon ip ospf gegevensbank nssa-extern-de informatie van de Beeldingen slechts over de externe LSAs van NSSA.
ip ospf database extern-displays alleen informatie over de externe LSA's tonen.
Toon ip ospf database [router] [link-staat-id]—Hier wordt een lijst weergegeven van alle LSA's van een router in de database. LSA's worden geproduceerd door elke router, en deze fundamentele LSA's maken een lijst van alle verbindingen, of interfaces, samen met de staten en de uitgaande kosten van de verbindingen. Ze worden alleen overstroomd in het gebied waar ze vandaan komen.
Toon ip ospf gegevensbestand samenvatting <link-staat id> —Hiermee geeft u de summiere links van de gebiedskader router (ABR) weer.
toon ip route-Toont de huidige status van de routingtabel.
Om te zien hoe de OSPF-database deze netwerkomgeving ziet, gebruikt u de opdracht ip ospf-database tonen.
r2.2.2.2#show ip ospf database OSPF Router with ID (2.2.2.2) (Process ID 2) Router Link States (Area 0) Link ID ADV Router Age Seq# Checksum Link count 2.2.2.2 2.2.2.2 1235 0x8000001D 0xD9FF 2 3.3.3.3 3.3.3.3 1100 0x8000000B 0x9455 2 Summary Net Link States (Area 0) Link ID ADV Router Age Seq# Checksum 4.0.0.0 2.2.2.2 1979 0x80000002 0xFDE7 5.0.0.0 2.2.2.2 1483 0x80000004 0x8864 Router Link States (Area 1) Link ID ADV Router Age Seq# Checksum Link count 1.1.1.1 1.1.1.1 319 0x8000000C 0xAFA8 3 2.2.2.2 2.2.2.2 220 0x8000002F 0xD478 2 Summary Net Link States (Area 1) Link ID ADV Router Age Seq# Checksum 6.0.0.0 2.2.2.2 1483 0x8000001C 0x7894 Type-7 AS External Link States (Area 1) Link ID ADV Router Age Seq# Checksum Tag 9.0.0.0 1.1.1.1 334 0x80000005 0xD738 0 Type-5 AS External Link States Link ID ADV Router Age Seq# Checksum Tag 9.0.0.0 2.2.2.2 1725 0x80000004 0x50C6 0
Om externe routes in een NSSA te adverteren, creëert de autonome systeem grensrouter (ASBR) nssa-externe LSAs (type 7).
r2.2.2.2#show ip ospf database nssa-external 9.0.0.0 OSPF Router with ID (2.2.2.2) (Process ID 2) Type-7 AS External Link States (Area 1) Routing Bit Set on this LSA LS age: 381 Options: (No TOS-capability, Type 7/5 translation, DC) !--- This can be translated into a type 5 LSA by !--- an ABR. LS Type: AS External Link Link State ID: 9.0.0.0 (External Network Number ) !--- The ASBR (Router 1.1.1.1) advertises !--- 9.0.0.0/8. Advertising Router: 1.1.1.1 !--- Router ID of the ASBR. LS Seq Number: 80000005 Checksum: 0xD738 Length: 36 Network Mask: /8 Metric Type: 1 (Comparable directly to link state metric) TOS: 0 Metric: 5 Forward Address: 4.0.0.1 !--- Forwarding address is incorrectly specified !--- as an interface on the ASBR.
ABR converteert type 7 LSA's naar type 5 LSA's en verspreidt het type 5 LSA's in normale gebieden.
r2.2.2.2#show ip ospf database external 9.0.0.0 OSPF Router with ID (2.2.2.2) (Process ID 2) Type-5 AS External Link States LS age: 1782 Options: (No TOS-capability, DC) LS Type: AS External Link Link State ID: 9.0.0.0 (External Network Number ) !--- Router 2.2.2.2 advertises 9.0.0.0/8. Advertising Router: 2.2.2.2 !--- When the conversion is complete, the advertising !--- router ID becomes the ABR router ID !--- because the ABR originates this type 5 LSA. LS Seq Number: 80000004 Checksum: 0x50C6 Length: 36 Network Mask: /8 Metric Type: 1 (Comparable directly to link state metric) TOS: 0 Metric: 5 Forward Address: 4.0.0.1 External Route Tag: 0 r2.2.2.2#show ip ospf database router 1.1.1.1 OSPF Router with ID (2.2.2.2) (Process ID 2) Router Link States (Area 1) Routing Bit Set on this LSA LS age: 426 Options: (No TOS-capability, DC) LS Type: Router Links Link State ID: 1.1.1.1 !--- For router links, Link State ID is always the same !--- as the advertising router (next line). Advertising Router: 1.1.1.1 LS Seq Number: 8000000C Checksum: 0xAFA8 Length: 60 AS Boundary Router !--- Bit E in the router LSA indicates that this router !--- originates from external LSAs. Number of Links: 3 !--- There are three links in area 1. Link connected to: a Stub Network !--- This represents the Ethernet segment 4.0.0.0/8. (Link ID) Network/subnet number: 4.0.0.0 (Link Data) Network Mask: 255.0.0.0 Number of TOS metrics: 0 TOS 0 Metrics: 10 !--- The OSPF cost of the Ethernet segment. Link connected to: another Router (point-to-point) !--- Shows that Router 1.1.1.1 is a neighbor with !--- Router 2.2.2.2. (Link ID) Neighboring Router ID: 2.2.2.2 (Link Data) Router Interface address: 5.0.0.1 !--- The interface address that connects to Router !--- 2.2.2.2 is 5.0.0.1. Number of TOS metrics: 0 TOS 0 Metrics: 64 !--- The OSPF cost of the link that connects !--- the two routers. Link connected to: a Stub Network !--- This represents the serial link 5.0.0.0/8. (Link ID) Network/subnet number: 5.0.0.0 (Link Data) Network Mask: 255.0.0.0 Number of TOS metrics: 0 TOS 0 Metrics: 64 !--- The OSPF cost of the serial link.
U kunt aan de dikke uitvoer hier zien dat hoewel router 2.2.2.2 geen herverdelings uitspraken in zijn configuratie heeft, het nog een ASBR is omdat het type 7 LSAs in type 5 LSAs converteert.
r2.2.2.2#show ip ospf database router 2.2.2.2 OSPF Router with ID (2.2.2.2) (Process ID 2) Router Link States (Area 0) LS age: 1361 Options: (No TOS-capability, DC) LS Type: Router Links Link State ID: 2.2.2.2 Advertising Router: 2.2.2.2 LS Seq Number: 8000001D Checksum: 0xD9FF Length: 48 Area Border Router !--- Bit B is set in the router LSA to indicate !--- that this router is an ABR. AS Boundary Router !--- Bit E in the router LSA indicates that this router !--- originates from external LSAs. Number of Links: 2 !--- There are two links in area 0. Link connected to: another Router (point-to-point) (Link ID) Neighboring Router ID: 3.3.3.3 (Link Data) Router Interface address: 6.0.0.2 Number of TOS metrics: 0 TOS 0 Metrics: 1 Link connected to: a Stub Network (Link ID) Network/subnet number: 6.0.0.0 (Link Data) Network Mask: 255.0.0.0 Number of TOS metrics: 0 TOS 0 Metrics: 1 Router Link States (Area 1) LS age: 346 Options: (No TOS-capability, DC) LS Type: Router Links Link State ID: 2.2.2.2 Advertising Router: 2.2.2.2 LS Seq Number: 8000002F Checksum: 0xD478 Length: 48 Area Border Router AS Boundary Router Number of Links: 2 Link connected to: another Router (point-to-point) (Link ID) Neighboring Router ID: 1.1.1.1 (Link Data) Router Interface address: 5.0.0.2 Number of TOS metrics: 0 TOS 0 Metrics: 64 Link connected to: a Stub Network (Link ID) Network/subnet number: 5.0.0.0 (Link Data) Network Mask: 255.0.0.0 Number of TOS metrics: 0 TOS 0 Metrics: 64 r2.2.2.2#show ip ospf database router 3.3.3.3 OSPF Router with ID (2.2.2.2) (Process ID 2) Router Link States (Area 0) LS age: 1245 Options: (No TOS-capability, DC) LS Type: Router Links Link State ID: 3.3.3.3 Advertising Router: 3.3.3.3 LS Seq Number: 8000000B Checksum: 0x9455 Length: 48 Number of Links: 2 Link connected to: another Router (point-to-point) (Link ID) Neighboring Router ID: 2.2.2.2 (Link Data) Router Interface address: 6.0.0.3 Number of TOS metrics: 0 TOS 0 Metrics: 1 Link connected to: a Stub Network (Link ID) Network/subnet number: 6.0.0.0 (Link Data) Network Mask: 255.0.0.0 Number of TOS metrics: 0 TOS 0 Metrics: 1
Om routes van het ene gebied naar het andere bekend te maken, creëert het ABR beknopte LSA's (type 3).
r2.2.2.2#show ip ospf database summary 4.0.0.0 OSPF Router with ID (2.2.2.2) (Process ID 2) Summary Net Link States (Area 0) LS age: 172 Options: (No TOS-capability, DC) LS Type: Summary Links(Network) Link State ID: 4.0.0.0 (summary Network Number) !--- The ABR (Router 2.2.2.2) advertises !--- 4.0.0.0/8 into area 0. Advertising Router: 2.2.2.2 LS Seq Number: 80000003 Checksum: 0xFBE8 Length: 28 Network Mask: /8 TOS: 0 Metric: 74 r2.2.2.2#show ip ospf database summary 5.0.0.0 OSPF Router with ID (2.2.2.2) (Process ID 2) Summary Net Link States (Area 0) LS age: 1687 Options: (No TOS-capability, DC) LS Type: Summary Links(Network) Link State ID: 5.0.0.0 (summary Network Number) !--- The ABR (Router 2.2.2.2) advertises !--- 5.0.0.0/8 into area 0. Advertising Router: 2.2.2.2 LS Seq Number: 80000004 Checksum: 0x8864 Length: 28 Network Mask: /8 TOS: 0 Metric: 64 r2.2.2.2#show ip ospf database summary 6.0.0.0 OSPF Router with ID (2.2.2.2) (Process ID 2) Summary Net Link States (Area 1) LS age: 1697 Options: (No TOS-capability, DC) LS Type: Summary Links(Network) Link State ID: 6.0.0.0 (summary Network Number) !--- The ABR (Router 2.2.2.2) advertises !--- 6.0.0.0/8 into area 1. Advertising Router: 2.2.2.2 LS Seq Number: 8000001C Checksum: 0x7894 Length: 28 Network Mask: /8 TOS: 0 Metric: 1
De ASBR-synthese LSA's zijn in dit geval niet nodig omdat het ABR afkomstig is van de externe LSA en het ABR bereikbaar is binnen gebied 0. Vergelijk dit voorbeeld met een scenario waarin de NSSA een normaal gebied was door te kijken naar het gegevensbestand voorbeeld Hoe OSPF externe Routes in meerdere gebieden verspreidt.
Deze routingtabeluitvoer toont de verschillende typen OSPF-routes die 9.0.0 door elke router bekend zijn.
r1.1.1.1#show ip route 9.0.0.0 Routing entry for 9.0.0.0/8 Known via "static", distance 1, metric 0 Redistributing via ospf 4 Advertised by ospf 4 metric 5 metric-type 1 Routing Descriptor Blocks: * 4.0.0.2 Route metric is 0, traffic share count is 1 r2.2.2.2#show ip route ospf O 4.0.0.0/8 [110/74] via 5.0.0.1, 01:10:13, Serial0/1/0 O N1 9.0.0.0/8 [110/79] via 5.0.0.1, 01:07:20, Serial0/1/0 R3.3.3.3#show ip route ospf O IA 4.0.0.0/8 [110/75] via 6.0.0.2, 02:11:14, ATM2/0.20 O IA 5.0.0.0/8 [110/65] via 6.0.0.2, 03:10:41, ATM2/0.20 O E1 9.0.0.0/8 [110/80] via 6.0.0.2, 02:08:11, ATM2/0.20
Er is momenteel geen specifieke troubleshooting-informatie beschikbaar voor deze configuratie.
Revisie | Publicatiedatum | Opmerkingen |
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1.0 |
10-Aug-2005 |
Eerste vrijgave |