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

A. debug ip ospf adj

B. show ip ospf [process-id]

C. show ip ospf virtual-links

D. show ip ospf border-routers

Explanation:
The correct answer is show ip ospf virtual-links. The show ip ospf virtual-links command displays the
current state of OSPF virtual links, as shown below.

Which command can you use to display information about OSPF virtual links? 1

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.

Which command can you use to display information about OSPF virtual links? 2

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
References:
Cisco > Cisco IOS IP Routing Protocols Command Reference > IP Routing Protocol-Independent
Commands: S through T > show ip ospf virtual-links

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