Inconsistent Memberships On Routers On The Same Subnet - 3Com MSR 50 Series Configuration Manual

Inconsistent
Memberships on
Routers on the Same
Subnet
Solution
1 Check that the networking is correct and that interface connections are correct.
2 Check that the interfaces and the host are on the same subnet. Carry out the
display current-configuration interface command to display the IPv6 address
of the interface.
3 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.
4 Check that the interface is normal and that a correct IPv6 address has been
configured. Carry out the display mld interface command to display the
interface information. If no interface information is output, the interface is
abnormal. Typically this is because the shutdown command has been executed
on the interface, or the interface connection is incorrect, or no correct IPv6 address
has been configured on the interface.
5 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.
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.
Troubleshooting MLD 1233