Configure the Router ID

The router ID that you configure must be one of the IP addresses of the IP interfaces configured in the switch.

You can configure an arbitrary value for the IP address for each router. However, each router ID must be unique. To ensure uniqueness, the router ID must match with one of the IP interface addresses of the router.

1. Configure the router ID.

   SEFOS# configure terminal
   SEFOS(config)# router ospf
   SEFOS(config-router)# router-id 10.10.2.1
   SEFOS(config-router)# exit
   

2. Examine the configuration details.

   SEFOS# show ip ospf
    
   OSPF Router ID 10.10.2.1
   Supports only single TOS(TOS0) route
   ABR Type supported is Standard ABR
   It is an Area Border Router
   Number of Areas in this router is 2
   Area is 0.0.0.6         
   Number of interfaces in this area is 1         
   SPF algorithm executed 6 times
   Area is 0.0.0.0         
   Number of interfaces in this area is 1         
   OSPF algorithm executed 6 times