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Verify OSPF Neighbors

Purpose

After you have checked OSPF interfaces, check your network topology to determine that all relevant neighbors are established.

Action

To verify OSPF neighbors, enter the following commands from the ingress, transit, and egress routers:

user@host> show ospf neighbor

Sample Output

user@R1> show ospf neighbor
  Address         Interface             State      ID              Pri  Dead
10.1.12.2        so-0/0/0.0             Full      10.0.0.2         128   39  
10.1.15.2        so-0/0/1.0             Full      10.0.0.5         128   39  
10.1.13.2        so-0/0/2.0             Full      10.0.0.3         128   33  

user@R3> show ospf neighbor 
Address         Interface             State      ID              Pri  Dead
10.1.34.2        so-0/0/0.0             Full      10.0.0.4         128   33  
10.1.23.1        so-0/0/1.0             Full      10.0.0.2         128   33  
10.1.13.1        so-0/0/2.0             Full      10.0.0.1         128   33  
10.1.36.2        so-0/0/3.0             Full      10.0.0.6         128   33  

user@R6> show ospf neighbor  
Address         Interface             State      ID              Pri  Dead
10.1.56.1        so-0/0/0.0             Full      10.0.0.5         128   30  
10.1.46.1        so-0/0/1.0             Full      10.0.0.4         128   38  
10.1.26.1        so-0/0/2.0             Full      10.0.0.2         128   34  
10.1.36.1        so-0/0/3.0             Full      10.0.0.3         128   35

Meaning

The sample output shows that all neighbors are fully adjacent, indicating that each router has exchanged a full copy of its link-state database with the other routers, passed through several neighbor states, and become fully adjacent. These adjacencies are created by router link and network link advertisements.