H3C S5500-EI - Page 286

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Figure 68 MLD snooping related ports
Ports involved in MLD snooping, as shown in Figure 68, are described as follows:
• Router port—Layer 3 multicast device-side port. Layer 3 multicast devices include designated
routers (DRs) and MLD querier. In the figure, GigabitEthernet 1/0/1 of Switch A and
GigabitEthernet 1/0/1 of Switch B are router ports. The switch registers all its router ports in its
router port list.
Do not confuse the "router port" in MLD snooping with the "routed interface" commonly known as
the "Layer 3 interface." The router port in MLD snooping is the Layer 2 interface.
• Member port—Multicast receiver-side port. In the figure, GigabitEthernet 1/0/2 and
GigabitEthernet 1/0/3 of Switch A and GigabitEthernet 1/0/2 of Switch B are member ports. The
switch registers all its member ports in its MLD snooping forwarding table.
Unless otherwise specified, router ports and member ports in this document include both static and
dynamic router ports and member ports.
NOTE:
A
n MLD snooping-enabled switch deems that the all its ports that receive MLD general queries with the
source address other than 0::0 or that receive IPv6 PIM hello messa
g
es are dynamic router ports. For more
information about IPv6 PIM hello messages, see "Configuring IPv6 PIM (available only on the
S5500-E
I)."
Aging timers for dynamic ports in MLD snooping and related messages and actions
Timer Descri
p
tion Messa
g
e before ex
p
ir
y
Action after ex
p
ir
y
Dynamic router
port aging timer
For each dynamic router port,
the switch starts an aging timer.
When the timer expires, the
dynamic router port ages out.
MLD general query of
which the source address
is not 0::0 or IPv6 PIM
hello.
The switch removes this
port from its router port
list.