Last Updated on August 1, 2021 by Admin 1
Which command can you use to display information about OSPF virtual links?
- debug ip ospf adj
- show ip ospf [process-id]
- show ip ospf virtual-links
- show ip ospf border-routers
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.
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 184.108.40.206 10 220.127.116.11 Ethernet 2 TRUE FALSE 0 3
i 18.104.22.168 10 22.214.171.124 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 126.96.36.199, 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.
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