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Troubleshooting IGMP snooping
Layer 2 multicast forwarding cannot function
Symptom
Layer 2 multicast forwarding cannot function on the switch.
Solution
To resolve the problem:
1. Use the display igmp-snooping command to display IGMP snooping status.
2. If IGMP snooping is not enabled, use the igmp-snooping command in system view to enable
IGMP snooping globally, and then use the igmp-snooping enable command in VLAN view to
enable IGMP snooping for the VLAN.
3. If IGMP snooping is enabled globally but not enabled for the VLAN, use the igmp-snooping
enable command in VLAN view to enable IGMP snooping for the VLAN.
4. If the problem persists, contact Hewlett Packard Enterprise Support.
Multicast group policy does not work
Symptom
Hosts can receive multicast data from multicast groups that are not permitted by the multicast group
policy.
Solution
To resolve the problem:
1. Use the display acl command to verify that the configured ACL meets the multicast group
policy requirements.
2. Use the display this command in IGMP-snooping view or in an interface view to verify that 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 igmp-snooping command to verify that the feature of dropping unknown
multicast data is enabled. If not, use the igmp-snooping drop-unknown command to enable
the feature of dropping unknown multicast data.
4. If the problem persists, contact Hewlett Packard Enterprise Support.
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