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Troubleshooting MLD snooping
Layer 2 multicast forwarding cannot function
Symptom
Layer 2 multicast forwarding cannot function through MLD snooping.
Solution
To resolve the problem:
1. Use the display mld-snooping command to display MLD snooping status.
2. If MLD snooping is not enabled, use the mld-snooping command in system view to enable
MLD snooping globally. Then, use the mld-snooping enable command in VLAN view to
enable MLD snooping for the VLAN.
3. If MLD snooping is enabled globally but not enabled for the VLAN, use the mld-snooping
enable command in VLAN view to enable MLD snooping for the VLAN.
4. If the problem persists, contact Hewlett Packard Enterprise Support.
IPv6 multicast group policy does not work
Symptom
Hosts can receive IPv6 multicast data for IPv6 multicast groups that are not permitted by the IPv6
multicast group policy.
Solution
To resolve the problem:
1. Use the display acl ipv6 command to verify that the configured IPv6 ACL meets the IPv6
multicast group policy requirements.
2. Use the display this command in MLD-snooping view or in a corresponding interface view to
verify that the correct IPv6 multicast group policy has been correctly applied. If it has not been
applied, use the group-policy or mld-snooping group-policy command to apply the correct
IPv6 multicast group policy.
3. Use the display mld-snooping command to verify that dropping unknown IPv6 multicast data
is enabled. If it is not, use the mld-snooping drop-unknown command to enable dropping
unknown IPv6 multicast data.
4. If the problem persists, contact Hewlett Packard Enterprise Support.
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