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• If the MLD version on the router interface is lower than that on the host, the router will not be able
to recognize the MLD report from the host.
• If the mld group-policy command has been configured on an interface, the interface cannot receive
report messages that fail to pass filtering.
Solution
1. Verify that the networking, interface connections, and IP address configuration are correct. Evaluate
the interface information by using the display mld interface command. If no information is output,
the interface is in an abnormal state. This is usually because you have configured the shutdown
command on the interface, the interface is not properly connected, or the IPv6 address
configuration is not correctly done.
2. Verify that the IPv6 multicast routing is enabled. Use the display current-configuration command to
check whether the multicast ipv6 routing-enable command has been executed. If not, use the
multicast ipv6 routing-enable command in system view to enable IPv6 multicast routing. In addition,
enable MLD on the corresponding interface.
3. Verify the MLD version on the interface. Use the display mld interface command to determine
whether the MLD version on the interface is lower than that on the host.
4. Verify that no ACL rule has been configured to restrict the host from joining IPv6 multicast group G.
Use the display current-configuration interface command to determine 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 that is 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 that are running different MLD versions
are compatible with hosts, all routers on the same subnet must run the same MLD version.
Inconsistent MLD versions that are 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 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 verify that the routers are running the same MLD version.
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