Step 3: 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 

What It Means

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.