HP 830 Series Configuration Manual page 249

Figure 218 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
are router ports. A 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
•
A and Ethernet 1/2 of Switch B are member ports. A switch registers all its member ports in the
IGMP snooping forwarding table.
Unless otherwise specified, router ports and member ports in this document consist of dynamic and static
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.
Aging timers for dynamic ports in IGMP snooping and related messages and actions
Timer
Dynamic router port
aging timer.
Dynamic member port
aging timer.
Figure 218, IGMP snooping divides the ports on Layer 2 switch into the following types:
Description
For each dynamic router
port, the switch starts an
aging timer. When the
timer expires, the
dynamic router port ages
out.
When a port dynamically
joins a multicast group,
the switch starts an aging
timer for the port. When
the timer expires, the
dynamic member port
ages out.
Figure 218, Ethernet 1/1 of Switch A and Ethernet 1/1 of Switch B
Figure 218, Ethernet 1/2 and Ethernet 1/3 of Switch
Message before expiry
IGMP general query of
which the source address
is not 0.0.0.0 or PIM
hello.
IGMP membership
report.
237
Action after expiry
The switch removes this
port from its router port
list.
The switch removes this
port from the IGMP
snooping forwarding
table.