3Com S7906E Configuration Manual page 1352

Router port: A router port is a port on the Ethernet switch that leads switch towards the Layer-3
multicast device (DR or MLD querier). In the figure, GigabitEthernet 2/0/1 of Switch A and
GigabitEthernet 2/0/1 of Switch B are router ports. The switch registers all its local router ports in its
router port list.
Member port: A member port (also known as IPv6 multicast group member port) is a port on the
Ethernet switch that leads towards multicast group members. In the figure, GigabitEthernet 2/0/2
and GigabitEthernet 2/0/3 of Switch A and GigabitEthernet 2/0/2 of Switch B are member ports.
The switch registers all the member ports on the local device in its MLD snooping forwarding table.
Whenever mentioned in this document, a router port is a router-connecting port on the switch,
rather than a port on a router.
Unless otherwise specified, router/member ports mentioned in this document include static and
dynamic ports.
On an MLD snooping-enabled switch, the ports that received MLD general queries with the source
address other than 0::0 or IPv6 PIM hello messages are dynamic router ports. For details about
IPv6 PIM hello messages, see IPv6 PIM Configuration of the IP Multicast Volume.
Aging timers for dynamic ports in MLD Snooping
Table 1-1 Aging timers for dynamic ports in MLD snooping and related messages and actions
Timer
For each dynamic router
Dynamic router port, the switch sets a timer
port aging timer initialized to the dynamic
router port aging time.
When a port dynamically
joins an IPv6 multicast
Dynamic
group, the switch sets a timer
member port
for the port, which is
aging timer
initialized to the dynamic
member port aging time.
The port aging mechanism of MLD snooping works only for dynamic ports; a static port will never age
out.
Description
MLD general query of
which the source
address is not 0::0 or
IPv6 PIM hello.
MLD report message.
1-3
Message before
expiry
The switch removes
this port from its router
port list.
The switch removes
this port from the MLD
snooping forwarding
table.
Action after expiry