Troubleshooting RIP 271
From the routing table, you can see RIPv2 uses classless subnet masks.
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Since RIPv1 routing information has a long aging time, it will still exist until aged
out after RIPv2 is configured.
Troubleshooting RIP
No RIP Updates Received Symptom:
No RIP updates are received when the links work well.
Analysis:
After enabling RIP, you must use the network command to enable corresponding
interfaces. Make sure no interfaces are disabled from handling RIP messages.
If the peer is configured to send multicast messages, the same should be
configured on the local end.
Solution:
■ Use the display current-configuration command to check RIP configuration
■ Use the display rip command to check whether some interface is disabled
Route Oscillation
Occurred
Symptom:
When all links work well, route oscillation occurs on the RIP network. After
displaying the routing table, you may find some routes appear and disappear in
the routing table intermittently.
Analysis:
In the RIP network, make sure all the same timers within the whole network are
identical and relationships between timers are reasonable. For example, the
timeout timer value should be larger than the update timer value.
Solution:
■ Use the display rip command to check the configuration of RIP timers
■ Use the timers command to adjust timers properly.
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