Which command can you use to display information about OSPF virtual links?

300-410 Part 06 Q13 080

The following additional commands are available to verify OSPF configurations: show ip ospf border-routers, debug ip ospf adj, and show ip ospf.

The show ip ospf border-routers command displays internal OSPF routing table entries for an ABR, as shown below.

router10#show ip ospf border-routers
Codes: i – Intra-area route, I-Inter-area route

Type Dest Address Cost NextHop Interface ABR ASBR Area SPF
i 2.2.2.2 10 192.1.1.199 Ethernet 2 TRUE FALSE 0 3
i 3.2.2.2 10 192.1.1.200 Ethernet 2 TRUE FALSE 0 3

The show ip ospf command displays information about the router’s role and each area to which the router is connected, as shown below.

The debug ip ospf adj command displays information about the state of neighbor adjacencies, as shown below.

R3#debug ip ospf adj
OSPF adjacency events debugging is on

00:54:04: OSPF: Rcv pkt from 172.12.23.2, Ethernet0, area 0.0.0.1 : src not on the same network

In the above example, either the IP address or the subnet mask is misconfigured on either this router or the neighbor.

Objective:
Layer 3 Technologies
Sub-Objective:
Configure and verify network types, area types, and router types