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Troubleshooting RIP update issues

Troubleshooting RIP update issues
7.2.6 This page will teach students how to troubleshoot RIP update issues.


Most of the RIP configuration errors involve an incorrect network statement, discontiguous subnets, or split horizons. An effective command that is used to find RIP update issues is the debug ip rip command.

The debug ip rip command displays RIP routing updates as they are sent and received. The example in Figure shows the output from the debug ip rip command after a router receives a RIP update. After the router receives and processes the update, it sends the updated information out its two RIP interfaces. The output shows the router uses RIP v1 and broadcasts the update with the broadcast address 255.255.255.255. The number in parenthesis represents the source address encapsulated into the IP header of the RIP update.

There are several key indicators to look for in the output of the debug ip rip command. Problems such as discontiguous subnetworks or duplicate networks can be diagnosed with this command. A symptom of these issues would be a router that advertises a route with a metric that is less than the metric it received for that network.

The following commands can also be used to troubleshoot RIP:

• show ip rip database
• show ip protocols {summary}
• show ip route
• debug ip rip {events}
• show ip interface brief
The next page will introduce the command that is used to prevent routing updates

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