H3C Technologies H3C S12500 Series Switches - Manual (Page 301)

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Figure 79 MLD snooping related ports
Ports involved in MLD snooping, as shown in Figure 79 , are described as follows:
• Router port—Layer 3 multicast device-side port. Layer 3 multicast devices include designated
routers and MLD queriers. In
Figure 79 , GigabitEthernet 3/0/1 of Switch A and GigabitEthernet
3/0/1 of Switch B are router ports. The switch registers all its local 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 a Layer 2 interface.
• Member port—Multicast receiver-side port. In Figure 79 , GigabitEthernet 3/0/2 and
GigabitEthernet 3/0/3 of Switch A and GigabitEthernet 3/0/2 of Switch B are member ports. The
switch registers all the member ports on the local device in its MLD snooping forwarding table.
Unless otherwise specified, router ports and member ports in this document include both static and
dynamic router ports and member ports.
NOTE:
When MLD snooping is enabled, all ports that receive IPv6 PIM hello messages or MLD general queries
with a source IP address other than 0::0 are considered dynamic router ports. For more information about
IPv6 PIM hello messages, see "Configuring IPv6 PIM."
Aging timers for dynamic ports in MLD snooping
Timer Description
Message before
expiration
Action after expiration
Dynamic router
port aging timer.
When a port receives an MLD
general query with source
address other than 0::0 or a
PIM hello message, the switch
starts or resets an aging timer
for the port. When the timer
expires, the dynamic router port
ages out.
MLD general query with
the source address other
than 0::0 or IPv6 PIM
hello.
The switch removes this
port from its router port
list.