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3.
Verify the IGMP version on the interface. Use the display igmp interface command to check
whether the IGMP version on the interface is lower than that on the host.
4. Check that no ACL rule has been configured to restrict the host from joining the multicast group G.
Use the display current-configuration interface command to check whether the igmp group-policy
command has been executed. If the host cannot join the multicast group G, modify the ACL rule to
allow receiving the reports for the multicast group G.
Inconsistent memberships on routers on the same subnet
Symptom
Different memberships are maintained on different IGMP routers on the same subnet.
Analysis
• A router that is running IGMP maintains multiple parameters for each interface, and these
parameters influence one another, forming very complicated relationships. Inconsistent IGMP
interface parameter configurations for routers on the same subnet will surely result in inconsistency
of memberships.
• In addition, although an IGMP router is compatible with a host that is running a different version 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 also leads to inconsistency of IGMP memberships.
Solution
1. Verify the IGMP configuration. Use the display current-configuration command to check the IGMP
configuration 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. The settings should be consistent on all routers.
3. Use the display igmp interface command to check whether all routers on the same subnet are
running the same version of IGMP.
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