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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, verify 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 that the settings are consistent on all routers.
3.
Use the
display igmp interface
command to verify that all routers on the same subnet are
running the same version of IGMP.
