H3C Technologies H3C WX6000 Series Access Controllers - Manual (Page 343)

29-25
Solution
1) Enter the display current-configuration command to view the running status of IGMP Snooping.
2) If IGMP Snooping is not enabled, use the igmp-snooping command to enable IGMP Snooping
globally, and then use igmp-snooping enable command to enable IGMP Snooping in VLAN view.
3) If IGMP Snooping is disabled only for the corresponding VLAN, just use the igmp-snooping
enable command in VLAN view to enable IGMP Snooping in the corresponding VLAN.
Configured Multicast Group Policy Fails to Take Effect
Symptom
Although a multicast group policy has been configured to allow hosts to join specific multicast groups,
the hosts can still receive multicast data addressed to other multicast groups.
Analysis
z
The ACL rule is incorrectly configured.
z
The multicast group policy is not correctly applied.
z
The function of dropping unknown multicast data is not enabled, so unknown multicast data is
flooded.
z
Certain ports have been configured as static member ports of multicasts groups, and this
configuration conflicts with the configured multicast group policy.
Solution
1) Use the display acl command to check the configured ACL rule. Make sure that the ACL rule
conforms to the multicast group policy to be implemented.
2) Use the display this command in IGMP Snooping view or in the corresponding interface view to
check whether the correct multicast group policy has been applied. If not, use the group-policy or
igmp-snooping group-policy command to apply the correct multicast group policy.
3) Use the display current-configuration command to check whether the function of dropping
unknown multicast data is enabled. If not, use the igmp-snooping drop-unknown command to
enable the function of dropping unknown multicast data.
4) Use the display igmp-snooping group command to check whether any port has been configured
as a static member port of any multicast group. If so, check whether this configuration conflicts with
the configured multicast group policy. If any conflict exists, remove the port as a static member of
the multicast group.