H3C Technologies H3C WX3000E Series Wireless Switches - Manual (Page 50)

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Figure 11 Port roles on an MLD snooping access controller
Aging timers for dynamic ports in MLD snooping
Timer Description Message before expiry Action after expiry
Dynamic router
port aging timer
For each dynamic router port,
the Layer 2 device sets a timer
initialized to the dynamic router
port aging time.
MLD general query of
which the source address
is not 0::0 or IPv6 PIM
hello.
The Layer 2 device
removes this port from its
router port list.
Dynamic member
port aging timer
When a port dynamically joins
an IPv6 multicast group, the
Layer 2 device sets a timer for
the port, which is initialized to
the dynamic member port aging
time.
MLD report message.
The Layer 2 device
removes this port from the
MLD snooping
forwarding table.
NOTE:
The port aging mechanism of MLD snooping works only for dynamic ports. Static ports never age out.
How MLD snooping works
An MLD snooping–enabled Layer 2 device performs different actions when it receives different MLD
messages.
The ports in this section are only dynamic ports. Static ports can be added or deleted only through the
corresponding configurations. For more information, see "
Configuring static ports ."
When receiving a general query
The MLD querier periodically sends MLD general queries to all hosts and routers identified by the IPv6
address FF02::1 on the local subnet to find out whether IPv6 multicast group members exist on the subnet.