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Figure 242 MLD snooping related ports

The following describes the ports involved in MLD snooping:

• Router port—Layer 3 multicast device-side port. Layer 3 multicast devices include designated

routers and MLD queriers. As shown in Figure 242, G

igabitEthernet 1/0/1 of Switch A and

GigabitEthernet 1/0/1 of Switch B are router ports. A switch records 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. As shown in Figure 242, G

igabitEthernet 1/0/2 and

GigabitEthernet 1/0/3 of Switch A and GigabitEthernet 1/0/2 of Switch B are member ports. A

switch records all local member ports in its MLD snooping forwarding table.

Unless otherwise specified, router ports and member ports in this document include both dynamic and

static ports.

NOTE:

hen MLD snoopin

is enabled, all ports that receive IPv6 PIM hello messa

es or MLD

eneral queries

ith source addresses other than 0::0 are considered dynamic router ports.

Aging timers for dynamic ports in MLD snooping

Timer Description

Message received

before the timer

ires

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 IPv6

PIM hello message, the switch

starts or resets an aging timer.

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 message.

The switch removes this

port from its router port

list.

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