Inconsistent Memberships On Routers On The Same Subnet - HP 4800G Series Configuration Manual

IPv6 multicast routing must be enabled on the router and MLD must be enabled on the interface
connecting to the host.
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) Check that the networking, interface connections, and IP address configuration are correct. Check
the interface information with the display mld interface command. If there is no information 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) 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) 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.
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