Cisco IOS Cookbook, 2nd Edition

Configuring RIP Version 1

Problem

You want to run RIP on a simple network.

Solution

The following commands show how to configure basic RIP functionality:

Router2#configure terminal 
Enter configuration commands, one per line.  End with CNTL/Z.
Router2(config)#interface Ethernet0
Router2(config-if)#ip address 192.168.30.1 255.255.255.0
Router2(config-if)#interface Serial0.1
Router2(config-subif)#ip address 172.25.2.2 255.255.255.0
Router2(config-subif)#exit
Router2(config)#router rip
Router2(config-router)#network 172.25.0.0
Router2(config-router)#network 192.168.30.0
Router2(config-router)#exit
Router2(config)#end
Router2#

Discussion

You enable RIP for an interface by associating its IP address with a network. For example, the Serial0.1 subinterface in this example has an IP address of 172.25.2.2. So if you want this subinterface to take part in RIP route distribution, you just need to include a network statement that includes its address:

Router2(config)#router rip
Router2(config-router)#network 172.25.0.0

If you have other interfaces that are also part of 172.25.0.0/16 on this router, they will take part in RIP as well. It’s important to note that RIP network statements work with classful network addresses. The network command may appear to accept subnets of classful addresses, but it will internally rewrite these subnet addresses with the classful network address:

Router2#configure terminal 
Enter configuration commands, one per line.  End with CNTL/Z.
Router2(config)#router rip Router2(config-router)# ...