H3C Technologies H3C S10500 Series Switches - Manual (Page 369)

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command on the interface, the interface is not properly connected, or the IPv6 address
configuration is not correctly done.
2. Check that the IPv6 multicast routing is enabled. Carry out the display current-configuration
command to check whether the multicast ipv6 routing-enable command has been executed. If not,
carry out the multicast ipv6 routing-enable command in system view to enable IPv6 multicast
routing. In addition, enable MLD on the corresponding interface.
3. Check the MLD version on the interface. You can use the display mld interface command to check
whether the MLD 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 IPv6 multicast group
G. Carry out the display current-configuration interface command to check whether the mld
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
• 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.
• 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. Use the display current-configuration command to verify the MLD configuration information on the
interface.
2. Use the display mld interface command on all routers on the same subnet to check the MLD timers
for inconsistent configuration.
3. Use the display mld interface command to check that the routers are running the same MLD
version.