Troubleshooting IGMP 627
abnormal. Typically this is because the shutdown command has been executed
on the interface, or the interface connection is incorrect, or no correct IP address
has been configured on the interface.
5 Check that no ACL rule has been configured to restrict the host from joining the
multicast group G. Carry out the display current-configuration interface
command to check whether the igmp group-policy command 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 IGMP routers are compatible with hosts, all routers on the
same subnet must run the same version of IGMP. Inconsistent IGMP versions
running on routers on the same subnet will also lead to inconsistency of IGMP
memberships.
Solution
1 Check the IGMP configuration. Carry out the display current-configuration
command to view the IGMP configuration information on the interfaces.
2 Carry out the display igmp interface command on all routers on the same
subnet to check the IGMP-related timer settings. Make sure that the settings are
consistent on all the routers.
3 Use the display igmp interface command to check whether the routers are
running the same version of IGMP.
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