Cisco IOS Cookbook, 2nd Edition

Configuring RIP Version 2

Problem

You want to use the more flexible features of RIP Version 2.

Solution

By default, Cisco routers will listen for both RIP Version 1 and 2 packets, but they will only send Version 1. If you want to configure the router to send and receive only Version 2 RIP packets, use the version 2 configuration command:

Router2#configure terminal 
Enter configuration commands, one per line.  End with CNTL/Z.
Router2(config)#router rip
Router2(config-router)#version 2
Router2(config-router)#network 172.25.0.0
Router2(config-router)#network 192.168.30.0
Router2(config-router)#end
Router2#

You can also enable RIP Version 2 by sending and receiving separately for individual interfaces:

Router1#configure terminal 
Enter configuration commands, one per line.  End with CNTL/Z.
Router1(config)#interface Serial0/0.2 
Router1(config-subif)#ip rip send version 2
Router1(config-subif)#ip rip receive version 2
Router1(config-subif)#end
Router1#

Discussion

By default, the router listens for Version 1 and 2 packets but it only sends Version 1. You can run both versions simultaneously on the same interface by simply specifying both versions as follows:

Router1(config)#interface Serial0/0.2 
Router1(config-subif)#ip rip send version 1 2

However, the router will then have to transmit all updates by using both versions, which can cause an unnecessary burden both for the router and the network. In general, RIP Version 2 is preferred, particularly because of the support for modern IP features, ...