HP FlexNetwork NJ5000, User Manual

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217
Figure 220 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 220 , GigabitEthernet 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 220 , GigabitEthernet 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:
When MLD snooping is enabled, all ports that receive IPv6 PIM hello messages or MLD general
queries with 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
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 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.
Dynamic member
port aging timer
When a port dynamically joins
an IPv6 multicast group, the
switch starts or resets an aging
timer for the port. When the
timer expires, the dynamic
MLD membership
report.
The switch removes this
port from the MLD
snooping forwarding
table.