H3C Technologies H3C S12500-X Series Switches - Manual (Page 136)

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The output shows that Ten-GigabitEthernet 1/0/3 on Switch A has become a static router port.
# Display information about the static MLD snooping forwarding entries in VLAN 100 on Switch C.
[SwitchC] display mld-snooping static-group vlan 100
Total 1 entries).
VLAN 100: Total 1 entries).
(::, FF1E::101)
Host slots (1 in total):
1
Host ports (2 in total):
XGE1/0/3
XGE1/0/5
The output shows that Ten-GigabitEthernet 1/0/3 and Ten-GigabitEthernet 1/0/5 on Switch C have
become static member ports of the IPv6 multicast group FF1E::101.
Troubleshooting MLD snooping
Layer 2 multicast forwarding cannot function
Symptom
Layer 2 multicast forwarding cannot function through MLD snooping.
Analysis
MLD snooping is not enabled.
Solution
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, and 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.
IPv6 multicast group filter does not work
Symptom
Hosts can receive multicast data from IPv6 multicast groups that are not permitted by the IPv6 multicast
group filter.
Analysis
• The IPv6 ACL is incorrectly configured.
• The IPv6 multicast group filter is not correctly applied.
• The function of dropping unknown IPv6 multicast data is not enabled, so unknown IPv6 multicast
data is flooded.