The quickest way to verify OSPF interface settings is to use the show ip ospf interface command. This command provides a detailed list for every OSPF-enabled interface. The command is useful to determine whether the network statements were correctly composed.
To get a summary of OSPF-enabled interfaces, use the show ip ospf interface brief command, as shown in Figure 1.
Use the Syntax Checker in Figure 2 to retrieve and view a summary of OSPF-enabled interfaces on R2 using the show ip ospf interface brief command. Notice that specifying the interface name as done in the show ip ospf interface serial 0/0/1 command provides detailed OSPF information.
Continue using the Syntax Checker in Figure 2 to get a summary of OSPF-enabled interfaces on R3 using the show ip ospf interface brief command. Retrieve and view additional information for the Serial 0/0/0 interface using the show ip ospf interface serial 0/0/0 command.