HP FlexNetwork NJ5000 User Manual page 229

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
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
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
Dynamic router
port aging timer
Dynamic member
port aging timer
Description
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.
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
Figure 220, GigabitEthernet 1/0/1 of Switch A and
Figure
Message received
before the timer
expires
MLD general query with
the source address other
than 0::0 or IPv6 PIM
hello message.
MLD membership
report.
217
220, GigabitEthernet 1/0/2 and
Action after the
timer expires
The switch removes this
port from its router port
list.
The switch removes this
port from the MLD
snooping forwarding
table.