Inconsistent Memberships On Routers On The Same Subnet - HP A6600 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, and IGMP must be enabled on the interface
•
connecting to the host.
• If the IGMP version on the router interface is lower than that on the host, the router will not be able to
recognize the IGMP report from the host.
If igmp group-policy has been configured on the interface, the interface cannot receive report
•
messages that fail to pass filtering.
Solution
Check that the networking, interface connection, and IP address configuration are correct. Check
1.
the interface information with display igmp interface. If no information is output, the interface is in an
abnormal state. This is usually because you have configured shutdown on the interface, the interface
is not properly connected, or the IP address configuration is not correctly done.
Check that multicast routing is enabled. Carry out display current-configuration to check whether
2.
multicast routing-enable has been executed. If not, carry out multicast routing-enable in system view
to enable IP multicast routing. In addition, check that IGMP is enabled on the corresponding
interfaces.
Check the IGMP version on the interface. You can use display igmp interface to check whether the
3.
IGMP version on the interface is lower than that on the host.
Check that no ACL rule has been configured to restrict the host from joining the multicast group G.
4.
Carry out display current-configuration interface to check whether igmp group-policy has been
executed. If the host is restricted from joining the multicast group G, the ACL rule must be modified
to allow receiving the reports for the multicast group G.

Inconsistent memberships on 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, and these parameters
•
influence one another, forming very complicated relationships. Inconsistent IGMP interface
parameter configurations for routers on the same subnet will surely result in inconsistency of
memberships.
In addition, although an IGMP router is compatible with a host that is running a different IGMP
•
version, all routers on the same subnet must run the same version of IGMP. Inconsistent IGMP
versions running on routers on the same subnet also leads to inconsistency of IGMP memberships.
Solution
Check the IGMP configuration. Carry out display current-configuration to view the IGMP
1.
configuration information on the interfaces.
Carry out display igmp interface on all routers on the same subnet to check the IGMP-related timer
2.
settings. Make sure that the settings are consistent on all the routers.
Use display igmp interface to check whether all the routers on the same subnet are running the same
3.
version of IGMP.
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