3Com 8807 Configuration Manual page 302

302 C 30: RIP C
HAPTER ONFIGURATION
Solution: RIP does not operate on the corresponding interface (for example, the
undo rip work command is executed) or this interface is not enabled through the
network command. The peer routing device is configured to be in the multicast
mode (for example, the rip version 2 multicast command is executed) but the
multicast mode has not been configured on the corresponding interface of the
local switch.