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OSPF Troubleshooting
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2007The CD contains a multimedia demonstration of using the show ip ospf command on an OSPF router
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The show ip ospf interface Command
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On an interface-by-interface basis, your OSPF router keeps track of what area an interface belongs to and what neighbors, if any, are connected to the interface To view this information, use the show ip ospf interface command:
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Router# show ip ospf interface Ethernet 1 is up, line protocol is up Internet Address 172162551/24, Area 0 Process ID 100, Router ID 172162551, Network Type BROADCAST, Cost: 10 Transmit Delay is 1 sec, State DROTHER, Priority 1 Designated Router id 1721625511, Interface address 1721625511 Backup Designated router id 1721625510, Interface addr 1721625510 Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5 Hello due in 0:00:03 Neighbor Count is 3, Adjacent neighbor count is 2 Adjacent with neighbor 1721625510 (Backup Designated Router) Adjacent with neighbor 1721625511 (Designated Router)
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The show ip ospf interface command displays your router s ID, the ID of the DR and BDR, the hello timer (10 seconds), the dead interval (40 seconds), the number of neighbors, and
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the number of adjacencies Remember that the hello and deal interval time values must match to become a neighbor with another OSPF router
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In this example, the router ID is 172162551 Its state is DROTHER, which means that it is not the DR or BDR Actually, the DR is 1721625511 and the BDR is 1721625510 (these are their router IDs) A total of three neighbors have two adjacencies remember that adjacencies are built only between routers and the DR and BDR, not all routers on the segment
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20: OSPF Routing
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2008The CD contains a multimedia demonstration of using the show ip ospf interface command on an OSPF router
The show ip ospf neighbor Command
To see all of your router s OSPF neighbors, use the show ip ospf neighbor command:
Router# show ip ospf ID Pri 1721625511 1 1721625510 1 172162559 1 172162542 1 neighbor State Dead Time FULL/DR 0:00:31 FULL/BDR 0:00:33 2WAY/DROTHER 0:00:35 FULL/DR 0:00:39 Address 1721625511 1721625510 172162559 172162542 Interface Ethernet0 Ethernet0 Ethernet0 Serial01
Remember that the show ip ospf neighbor command lists all of the router s OSPF neighbors, their OSPF
states, their router IDs, and which interface the neighbors are connected to
In this example, three routers are connected to Ethernet0: 1721625511 is a DR, 1721625510 is a BDR, and 172162559 is another OSPF router (DROTHER) Notice that for the DR and the BDR, the state is full, which is to be expected, since this router and the DR/BDR share routing information with each other The DROTHER router is in a two-way state, which indicates that the router is a neighbor, but this router and the DROTHER router will not share routing information directly with each other since the other router is not a DR or BDR Optionally, you can add the ID of the neighbor to the show ip ospf neighbor command to get more information about a particular neighbor If the MTU sizes are different on the OSPF routers interfaces, they will not become neighbors; verify the MTU size on each neighbor with the show interfaces or show ip interfaces command 2009The CD contains a multimedia demonstration of using the show ip ospf neighbor command on an OSPF router
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OSPF Troubleshooting
The debug ip ospf adj Command
For more detailed troubleshooting, you can use debug commands If you want to view the adjacency process that a router builds to other routers, use the debug ip ospf adj command:
Router# debug ip ospf adj 1721625511 on Ethernet0, state 2WAY OSPF: end of Wait on interface Ethernet0 OSPF: DR/BDR election on Ethernet0 OSPF: Elect BDR 1721625510 OSPF: Elect DR 1721625511 DR: 1721625511 (Id) BDR: 1721625510 (Id) OSPF: Send DBD to 1721625511 on Ethernet0 seq 0x10DB opt 0x2 flag 0x7 len 32 OSPF: Build router LSA for area 0, router ID 1721625511
In this example, you can see the election process for the DR and BDR and the sharing of links (DBDs) with the DR If two routers have misconfigured the authentication type for OSPF, such as clear-text passwords on one and MD5 on the other, you ll see the following with the above debug command:
OSPF: Rcv pkt from 19216811, Serial1/0: Mismatch Authentication type Input packet specified type 0, we use type 1
However, if you have mismatched the passwords (keys) on the two OSPF routers, you ll see something like this:
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