Route Flapping Occurs on a RIP Network

Route flapping occurs on a RIP network when the link runs properly. Some routes intermittently disappear in the routing table.

Run the display rip command to check the configuration of RIP timers.
The RIP timers on the entire network must be consistent; otherwise, route flapping occurs. The relationships between the timer values are update < age, update < garbage-collect.
Run the timers rip update age garbage-collect command to set the RIP timers.