Cisco CCNP / BSCI Tutorial: Route Summarization With RIP And EIGRP
To pass your BSCI exam and earn your CCNP certification, you’ve got to master route summarization. When you get to the BSCI level, actually breaking the routes down into binary strings and performing summarization is second nature to you. (If it isn’t, get some more practice!) What makes CCNP / BSCI route summarization more difficult is just keeping the different protocol summarization commands straight!
RIP and EIGRP both perform route summarization at the interface level with the ip summary-address command. In the following example, R2 is running RIP and was sending four routes to R3, R3’s table looked like this before summarization:
R3#show ip route rip
172.16.0.0/24 is subnetted, 4 subnets
R 172.16.8.0 [120/1] via 172.23.23.2, 00:00:02, Ethernet0
R 172.16.9.0 [120/1] via 172.23.23.2, 00:00:02, Ethernet0
R 172.16.10.0 [120/1] via 172.23.23.2, 00:00:02, Ethernet0
R 172.16.11.0 [120/1] via 172.23.23.2, 00:00:02, Ethernet0
By summarizing the routes and using the ip summary-address command, RIP advertises only the summary route to...
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