3Com 3C13636 Configuration Manual page 595

3Com Router 3000 Ethernet Family
Configuration Guide
The opposite router is configured as the multicast mode (for example, the rip version 2
multicast command is executed) but the local router is not configured as the multicast
mode.
Symptom 2: Route oscillation occurs to the network running RIP.
Troubleshooting: Use display rip command on each router that runs RIP to view the
configuration of RIP timers. If the values of Period update timer and Timeout timer on
different routers are different, you should reset them conformably and make sure that
the timing length of Timeout timer is longer than that of Period update timer.
3Com Corporation
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Chapter 3 RIP Configuration