H3C S9500 Series Operation Manual page 5

Operation Manual – IGMP Snooping
H3C S9500 Series Routing Switches
Router port: A router port is a port on the Layer-3 multicast device or the IGMP
querier side of the Ethernet switch. In the figure, Ethernet 1/1/10 of Switch A and
Ethernet 1/0 of Switch B are router ports. A switch registers all its local router ports
(including dynamic and static router ports) in its router port list.
Member port: Also known as a listener port, a member port is a port on the
multicast group member side of the Ethernet switch. In the figure, Ethernet 1/1/1
and Ethernet 1/1/2 of Switch A and Ethernet 1/1/1 of Switch B are member ports.
The switch records all member ports (including dynamic and static member ports)
on the local device in the IGMP Snooping forwarding table.
Note:
Whenever mentioned in this document, a router port is a port on a switch that leads
the switch to a Layer 3 multicast device, rather than a port on a router.
An IGMP-snooping-enabled switch deems all its ports on which IGMP general
queries with the source address other than 0.0.0.0 or PIM hello messages are
received to be dynamic router ports. For details about PIM hello messages, see PIM
Configuration of the IP Multicast Volume.
II. Port aging timers in IGMP Snooping and related messages and actions
Table 1-1 Port aging timers in IGMP Snooping and related messages and actions
Timer
Dynamic
router port
aging timer
Dynamic
member port
aging timer
Note:
The port aging mechanism of IGMP Snooping works only on dynamic ports; a static
port will never age out.
Description
For each dynamic router
port, the switch sets a
timer initialized to the
dynamic router port aging
time
When a port dynamically
joins a multicast group, the
switch sets a timer for the
port, which is initialized to
the dynamic member port
aging time.
1-3
Chapter 1 IGMP Snooping Configuration
Message before
expiry
IGMP general
The switch
query of which the
removes this
source address is
port from its
not 0.0.0.0 or PIM
router port list
hello
The switch
removes this
port from the
IGMP report
IGMP Snooping
forwarding
table.
Action after
expiry