4000 Router Series IP Multicast Configuration Guide

• In addition, although IGMP routers are partially compatible with hosts that separately run different

versions of IGMP, all routers on the same subnet must run the same version of IGMP. Inconsistent

IGMP versions running on routers on the same subnet leads to inconsistency of IGMP memberships.

Solution

1. Use the display current-configuration command to verify the IGMP information on the interfaces.

2. Use the display igmp interface command on all routers on the same subnet to verify the

IGMP-related timer settings. Make sure the settings are consistent on all the routers.

3. Use the display igmp interface command to verify that all the routers on the same subnet are

running the same IGMP version.