R3102-R3103-HP 6600/HSR6600 Routers IP Multicast Configuration Guide

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• 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 you have configured the igmp group-policy command on the interface, the interface cannot
receive report messages that fail to pass filtering.
Solution
1. Use the display interface command to verify that the networking, interface connection, and IP
address configuration are correct. If the interface is physically down or the protocol state of the
interface is down, the interface is in an abnormal state. The reason might be that you have
configured the shutdown command on the interface, that the interface is not correctly connected,
or that the IP address configuration is not correctly completed.
2. Use the display current-configuration command to verify that multicast routing is enabled. If not,
use the multicast routing-enable command in system view to enable IP multicast routing. In
addition, check that IGMP is enabled on the corresponding interfaces.
3. Use the display igmp interface command to verify that the IGMP version on the interface is lower
than that on the host.
4. Use the display current-configuration interface command to verify that no ACL rule has been
configured to restrict the host from joining the multicast group G. 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.
Membership information is inconsistent on the routers on the
same subnet
Symptom
The IGMP routers on the same subnet have different membership information.
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 version 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 also leads to inconsistency of IGMP memberships.
Solution
1. Use the display current-configuration command to verify the IGMP configuration information on
the interfaces.
2. Use the display igmp interface command on all routers on the same subnet to verify the
IGMP-related timer settings. Make sure the settings are consistent on all the routers.
3. Use the display igmp interface command to verify that all the routers on the same subnet are
running the same version of IGMP.