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Solution
1. Use the display acl ipv6 command to verify that the configured IPv6 ACL meets the IPv6 multicast
group filter 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 filter has been applied. If not, use the group-policy or
mld-snooping group-policy command to apply the correct IPv6 multicast group filter.
3. Use the display mld-snooping command to verify that the function of dropping unknown IPv6
multicast data is enabled. If not, use the mld-snooping drop-unknown command to enable
dropping unknown IPv6 multicast data.