H3C Technologies H3C S10500 Series Switches - Manual (Page 140)

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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.
Carry out the display current-configuration interface command to check whether the igmp
group-policy command has been executed. If the host is restricted from joining the multicast group
G, the ACL rule must be modified 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 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. Carry out 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 the routers.
3. Use the display igmp interface command to check whether all the routers on the same subnet are
running the same version of IGMP.