[RIPv2] Configure Unicast Updates

RIPv1 sends everything using broadcasts compared to RIPv2, which uses multicast however you can use unicast to send RIPv2 updates, which is our topic today.

We have the following topology, we want R1, R2 and R3 to send RIPv2 advertisement using unicast instead of multicast.

RIPv2 Topology

After configuring RIPv2 on all routers, we need to set the interface on R1, R2 and R3 that is connected to the switch as passive interface and configure a static neighbor on these routers.

For R1:

R1(config)#router rip
R1(config-router)#passive-interface FastEthernet0/0
R1(config-router)#neighbor 10.1.123.2
R1(config-router)#neighbor 10.1.123.3

For R2:

R2(config)#router rip
R2(config-router)#passive-interface FastEthernet0/0
R2(config-router)#neighbor 10.1.123.1
R2(config-router)#neighbor 10.1.123.3

For R3:

R3(config)#router rip
R3(config-router)#passive-interface FastEthernet0/0
R3(config-router)#neighbor 10.1.123.1
R3(config-router)#neighbor 10.1.123.2

The neighbor command turns on unicast for RIP updates. However, a router still uses multicast (224.0.0.9) as well. To turn off multicast RIP updates completely, the passive-interface command is required.

I hope this been informative for you, enjoy !

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