Inconsistent Membership Information On The Routers On The Same Subnet - HP 5920 series Configuration Manual

Analysis
The correctness of networking and interface connections and whether the protocol layer of the
•
interface is up directly affect the generation of group membership information.
• Multicast routing must be enabled on the router. IGMP must be enabled on the interface that
connects to the host.
If the IGMP version on the router interface is lower than that on the host, the router cannot recognize
•
the IGMP report from the host.
If you have configured the igmp group-policy command on the interface, the interface cannot
•
receive report messages that failed to pass filtering.
Solution
Use the display igmp interface command to verify that the networking, interface connection, and
1.
IP address configuration are correct. If the command does not produce output, the interface is in an
abnormal state. The reason might be that you have configured the shutdown command on the
interface, the interface is not properly connected, or the IP address configuration is not correctly
completed.
Use the display current-configuration command to verify that multicast routing is enabled. If it is not
2.
enabled, use the multicast routing-enable command in system view to enable IP multicast routing.
In addition, verify that IGMP is enabled on the associated interfaces.
Use the display igmp interface command to verify that the IGMP version on the interface is lower
3.
than that on the host.
Use the display current-configuration interface command to verify that no ACL rule has been
4.
configured to filter out the reports sent by the host to the multicast group G.
Inconsistent membership information on the routers on the same
subnet
Symptom
Different memberships are maintained on different IGMP routers on the same subnet.
Analysis
• A router running IGMP maintains multiple parameters for each interface. Inconsistent IGMP
interface parameter configurations for routers on the same subnet will result in inconsistency of
memberships.
In addition, although IGMP routers are partially compatible with hosts that separately run different
•
versions of IGMP, all routers on the same subnet must run the same version of IGMP. Inconsistent
IGMP versions running on routers on the same subnet leads to inconsistency of IGMP memberships.
Solution
Use the display current-configuration command to verify the IGMP information on the interfaces.
1.
Use the display igmp interface command on all routers on the same subnet to verify the
2.
IGMP-related timer settings. Make sure the settings are consistent on all the routers.
Use the display igmp interface command to verify that all the routers on the same subnet are
3.
running the same IGMP version.
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