Cisco Systems CCNA 2 manual Verifying RIP configuration, Troubleshooting RIP update issues

command. The RIP version can also be changed with the version [1 2] router configuration command. Other variations of this command may be placed on the interface to specify which version of packets to send and receive.

7.2.5 Verifying RIP configuration

The show ip protocol and the show ip route commands can be used to verify the configuration of RIP. The show ip protocol command displays information about all of the IP routing protocols that are used on the router. This command can be used to verify that RIP is configured, interfaces are correctly sending and receiving RIP updates, and that the router is advertising the correct networks. The basic timers, filters, and version can also be verified with the show ip protocol command. The show ip route command can be used to verify that RIP routes are received. These routes will be identified by an “R”, which indicates that they were learned through RIP.

7.2.6 Troubleshooting RIP update issues

Some common RIP configuration errors include incorrect network statements, discontiguous subnets, and split horizons. These RIP update issues can be identified with some basic show and debug commands. The debug ip rip command enables rip debugging and will display all of the rip updates as they are sent and received. The following is an example of the output of the debug ip rip command:

LAB-A#debug ip rip

RIP protocol debugging is on LAB-A#

RIP: ignored v1 update from bad source 223.8.151.1 on Ethernet0

RIP: sending v1 update to 255.255.255.255 via Ethernet0 (192.5.5.1)

network 204.204.7.0, metric 3 network 223.8.151.0, metric 3 network 201.100.11.0, metric 1 network 219.17.100.0, metric 2 network 199.6.13.0, metric 2 network 205.7.5.0, metric 1 network 210.93.105.0, metric 4

RIP: sending v1 update to 255.255.255.255 via Ethernet1 (205.7.5.1)

network 204.204.7.0, metric 3 network 223.8.151.0, metric 3 network 201.100.11.0, metric 1 network 219.17.100.0, metric 2 network 192.5.5.0, metric 1 network 199.6.13.0, metric 2 network 210.93.105.0, metric 4

RIP: sending v1 update to 255.255.255.255 via Serial0 (201.100.11.1)

network 192.5.5.0, metric 1 network 205.7.5.0, metric 1

RIP: ignored v1 update from bad source 219.17.100.1 on Ethernet0

RIP: received v1 update from 201.100.11.2 on Serial0 204.204.7.0 in 2 hops

223.8.151.0 in 2 hops

84 - 238 CCNA 2: Routers and Routing Basics v3.1 Instructor Guide – Module 7 Copyright ♥ 2004, Cisco Systems, Inc.