H3C Technologies H3C S12500-X Series Switches - Manual (Page 117)

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Figure 37 MLD snooping related ports
The following describes the ports involved in MLD snooping, as shown in Figure 37 :
• Router port—Layer 3 multicast device-side port. Layer 3 multicast devices include designated
routers and MLD queriers. In Figure 37 , Ten-GigabitEthernet 1/0/1 of Switch A and
Ten-GigabitEthernet 1/0/1 of Switch B are the router ports. A switch records all its local router ports
in a 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 37 , Ten-GigabitEthernet 1/0/2 and
Ten-GigabitEthernet 1/0/3 of Switch A and Ten-GigabitEthernet 1/0/2 of Switch B are member
ports. A switch records all its local 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:
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
Expected messages before
the timer expires
Action after the timer
expires
Dynamic
router port
aging timer
When a port receives an MLD
general query with the source
address other than 0::0 or an IPv6
PIM hello message, the switch
starts or resets an aging timer.
MLD general query with the
source address other than
0::0 or IPv6 PIM hello
message.
The switch removes the
port from its router port
list.
Dynamic
member port
aging timer
When a port dynamically joins a
multicast group, the switch starts or
resets an aging timer for the port.
MLD report message.
The switch removes the
port from the MLD
snooping forwarding
table.