H3C Technologies H3C S12500 Series Switches - Manual (Page 329)

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When Host A leaves the IPv6 multicast group, it sends an MLD done message to Switch A.
Receiving the message, Switch A removes port GigabitEthernet 3/0/3 from the member port list
of the forwarding entry for the group; however, it does not remove the group or forward the done
message to Router A because Host B is still in the group. Use the display mld-snooping group
command to display information about MLD snooping groups. For example:
# Display information about MLD snooping groups on Switch A.
[SwitchA] display mld-snooping group
Total 1 IP Group(s).
Total 1 IP Source(s).
Total 1 MAC Group(s).
Port flags: D-Dynamic port, S-Static port, C-Copy port, P-PIM port
Subvlan flags: R-Real VLAN, C-Copy VLAN
Vlan(id):100.
Total 1 IP Group(s).
Total 1 IP Source(s).
Total 1 MAC Group(s).
Router port(s):total 1 port(s).
GE3/0/1 (D)
IP group(s):the following ip group(s) match to one mac group.
IP group address:FF1E::101
(::, FF1E::101):
Host port(s):total 1 port(s).
GE3/0/4 (D)
MAC group(s):
MAC group address:3333-0000-0101
Host port(s):total 1 port(s).
GE3/0/4
Troubleshooting MLD snooping
Layer 2 multicast forwarding cannot work
Symptom
Layer 2 multicast forwarding cannot work.
Analysis
MLD snooping is not enabled.
Solution
1. Use 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 the mld-snooping enable command to enable MLD snooping in VLAN view.
3. If MLD snooping is disabled only for the corresponding VLAN, use the mld-snooping enable
command in VLAN view to enable MLD snooping in the corresponding VLAN.