H3C Technologies H3C S7500E Series Switches - Manual (Page 351)

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group-policy command has been executed. If an IPv6 ACL is configured to restrict the host from
joining IPv6 multicast group G, the ACL must be modified to allow IPv6 multicast group G to
receive report messages.
Inconsistent Memberships on Routers on the Same Subnet
Symptom
Different memberships are maintained on different MLD routers on the same subnet.
Analysis
z A router running MLD maintains multiple parameters for each interface, and these parameters
influence one another, forming very complicated relationships. Inconsistent MLD interface
parameter configurations for routers on the same subnet will surely result in inconsistent MLD
memberships.
z Two MLD versions are currently available. Although routers running different MLD versions are
compatible with hosts, all routers on the same subnet must run the same MLD version.
Inconsistent MLD versions running on routers on the same subnet will also lead to inconsistent
MLD memberships.
Solution
1) Check MLD configurations. Carry out the display current-configuration command to display the
MLD configuration information on the interface.
2) Carry out the display mld interface command on all routers on the same subnet to check the
MLD timers for consistent configurations.
3) Use the display mld interface command to check that the routers are running the same MLD
version.