602 CHAPTER 43: MLD SNOOPING CONFIGURATION
Troubleshooting MLD
Snooping
Switch Fails in Layer 2
Multicast Forwarding
Symptom
A switch fails to implement Layer 2 multicast forwarding.
Analysis
MLD Snooping is not enabled.
Solution
1 Enter the display current-configuration command to view the running status of
MLD Snooping.
2 If MLD Snooping is not enabled, use the mld-snooping command to enable MLD
Snooping globally, and then use mld-snooping enable command to enable MLD
Snooping in VLAN view.
3 If MLD Snooping is disabled only for the corresponding VLAN, just use the
mld-snooping enable command in VLAN view to enable MLD Snooping in the
corresponding VLAN.
Configured IPv6
Multicast Group Policy
Fails to Take Effect
Symptom
Although an IPv6 multicast group policy has been configured to allow hosts to join
specific IPv6 multicast groups, the hosts can still receive IPv6 multicast data
addressed to other groups.
Analysis
■ The IPv6 ACL rule is incorrectly configured.
■ The IPv6 multicast group policy is not correctly applied.
■ The function of dropping unknown IPv6 multicast data is not enabled, so
unknown IPv6 multicast data is flooded.
■ Certain ports have been configured as static member ports of IPv6 multicasts
groups, and this configuration conflicts with the configured IPv6 multicast
group policy.
Solution
1 Use the display acl ipv6 command to check the configured IPv6 ACL rule. Make
sure that the IPv6 ACL rule conforms to the IPv6 multicast group policy to be
implemented.
2 Use the display this command in MLD Snooping view or the corresponding
interface view to check whether the correct IPv6 multicast group policy has been
applied. If not, use the group-policy or mld-snooping group-policy command
to apply the correct IPv6 multicast group policy.
3 Use the display current-configuration command to whether the function of
dropping unknown IPv6 multicast data is enabled. If not, use the mld-snooping
drop-unknown command to enable the function of dropping unknown IPv6
multicast data.
4 Use the display mld-snooping group command to check whether any port has
been configured as a static member port of any IPv6 multicast group. If so, check
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