HP 1920 Series User Manual page 280

Figure 242 MLD snooping related ports
The following describes the ports involved in MLD snooping:
•
•
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
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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.
Timer Description
When a port receives an MLD
general query with the source
address other than 0::0 or IPv6
Dynamic router
PIM hello message, the switch
port aging timer
starts or resets an aging timer.
When the timer expires, the
dynamic router port ages out.
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Figure 242, GigabitEthernet 1/0/1 of Switch A and
Figure 242, GigabitEthernet 1/0/2 and
Message received
before the timer
expires
MLD general query with
the source address other
than 0::0 or IPv6 PIM
hello message.
267
Action after the timer
expires
The switch removes this
port from its router port
list.