HP MSR ASM Configuration Manual page 148

IGMP snooping related ports
As shown in
Switch B, and Host A and Host C are receiver hosts (namely, members of a multicast group).
Figure 44 IGMP snooping related ports
As shown in
Router port—Layer 3 multicast device-side port. Layer 3 multicast devices include designated
•
routers and IGMP queriers. In the figure, Ethernet 1/1 of Switch A and Ethernet 1/1 of Switch B are
router ports. The switch registers all its local router ports in its router port list.
Do not confuse the "router port" in IGMP snooping with the "routed interface" commonly known as
the "Layer 3 interface." The router port in IGMP snooping is the Layer 2 interface.
Member port—Multicast receiver-side port. In the figure, Ethernet 1/2 and Ethernet 1/3 of Switch
•
A and Ethernet 1/2 of Switch B are member ports. The switch registers all the member ports on the
local device in its IGMP snooping forwarding table.
Unless otherwise specified, router ports and member ports in this document include both static and
dynamic router ports and member ports.
Dynamic router ports include ports that receive IGMP general queries with the source IP address other
than 0.0.0.0 and ports that receive PIM hello messages. For more information about PIM hello messages,
see "Configuring PIM."
Aging timers for dynamic ports in IGMP snooping and related messages and actions
Timer
Dynamic router port
aging timer
Figure 44, Router A connects to the multicast source, IGMP snooping runs on Switch A and
Figure 44, IGMP snooping divides the ports on Layer 2 switch into the following types:
Description
When a port receives an
IGMP general query with
the source address other
than 0.0.0.0 or PIM
hello, the switch starts or
resets an aging timer for
the port. When the timer
expires, the dynamic
router port ages out.
Message before
expiration
IGMP general query with
the source address other
than 0.0.0.0 or PIM
hello.
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Action after expiration
The switch removes this
port from its router port
list.