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After the configuration is completed, Host A and Host B send MLD join messages addressed to group
FF1E::101. When receiving the messages, Switch A sends a join message for the group out port
GigabitEthernet 1/0/1—a router port—to Router A. Use the display mld-snooping group command and
the display mld group command to display information about MLD snooping groups and MLD multicast
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
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).
GE1/0/1 (D) ( 00:01:23 )
IP group(s):the following ip group(s) match to one mac group.
IP group address:FF1E::101
(::, FF1E::101):
Host port(s):total 2 port(s).
GE1/0/3 (D)
GE1/0/4 (D)
MAC group(s):
MAC group address:3333-0000-0101
Host port(s):total 2 port(s).
GE1/0/3
GE1/0/4
# Display information about MLD multicast groups on Router A.
[RouterA] display mld group
Total 1 MLD Group(s).
Interface group report information
GigabitEthernet1/0/1(2001::1):
Total 1 MLD Group reported
Group Address: FF1E::1
Last Reporter: FE80::2FF:FFFF:FE00:1
Uptime: 00:00:03
Expires: 00:04:17
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 1/0/3 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).
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