No RIP updates are received when the links work well.
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.
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
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.
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 greater
than the update timer value.
Use the display rip command to check the configuration of RIP timers
Use the timers command to adjust timers properly.