Because RIPv2 is merely an enhancement of RIPv1 and not a separate protocol, the commands introduced in Chapter 5 for manipulating timers and metrics and for configuring unicast updates or no updates at all are used in exactly the same way. After a brief look at configuring a RIPv2 process, the rest of this section concentrates on configuring the new extensions.
By default, a RIP process configured on a Cisco router sends only RIPv1 messages but listens to both RIPv1 and RIPv2. This default is changed with the version command, as in the following example:
router rip version 2 network 172.25.0.0 network 192.168.50.0
In this mode, the router sends and receives only RIPv2 messages. ...