[RIPv2] Configuring Route Summarization

In this lab, we will see how to configure RIP route summarization.

Here’s the topology we will use:

Here’s the RIPv2 configuration before summarization:

For R1:

R1(config)#router rip
R1(config-router)#version 2
R1(config-router)#no auto-summary 
R1(config-router)#network 192.168.1.0
R1(config-router)#network 172.16.0.0

For R2:

R1(config)#router rip
R2(config-router)#version 2
R2(config-router)#no auto-summary 
R2(config-router)#network 192.168.1.0

The routing table of router R2 will look like this:

R2#show ip route rip 
     172.16.0.0/24 is subnetted, 2 subnets
R       172.16.0.0 [120/1] via 192.168.1.1, 00:00:24, FastEthernet0/0
R       172.16.1.0 [120/1] via 192.168.1.1, 00:00:24, FastEthernet0/0

Above you see both networks. Now let’s create a summary:

172.16.0.0 = 172.16.00000000.0/24
172.16.1.0 = 172.16.00000001.0/24
             --------------------
           = 172.16.0.0/23

The /23 is the more specific because it only covers 172.16.0.0/24 and 172.16.1.0/24

R1(config)#interface fastEthernet 0/0
R1(config-if)#ip summary-address rip 172.16.0.0 255.255.254.0

This is what it looks like on router R2:

R2#show ip route rip 
     172.16.0.0/23 is subnetted, 1 subnets
R       172.16.0.0 [120/1] via 192.168.1.1, 00:00:22, FastEthernet0/0

I hope this been informative for you, enjoy !

Tagged: ccnp, cisco, rip, routing, summarization