9.1.2.
Understand the two types of IGMP Snooping port
As shown in the figure below, the Router connection multicast source, run in the Switch A IGMP
Snooping, Host A and Host C for receiver Host (i.e., IP multicast group members).
Two types of IGMP Snooping port
Multicast Router Port
：
Switches connected multicast router(three layer multicast equipment)
，
Such as
the Switch of A Gi 0/1 port.Switches connect all routing of this device ports (including dynamic and
static ports) are recorded in the routing connection list.Router connection by default is corresponding
to the receiver of multicast data within a VLAN can be added to the IGMP Snooping in turn.
Member Port
：
Short for IP multicast group members port,Also known as the Listener Port,Said switch
connection port of the IP multicast group side,Such as the SwitchA of Gi 0/2
、
Gi 0/3 and Gi 0/4 port
。
Switch to all members of the ports on the device (including dynamic and static port) is recorded in the
IGMP Snooping in turn.
9.1.3.
Understanding the dynamic aging timer of the port
IGMP Snooping Dynamic port of aging timer
Type
Description
Start the event triggered
a timer
Timeout after the switch
Aging timer
dynamic routing
connection port
Switch for each dynamic
routing connections
are starting a timer aging
time, thetimeout is the
dynamic routing connection
port
IGMP group received
query message or PIM
Hello message
The port is removed from
the routing connections
list
Aging timer dyna
mic member port
Switch to the port starts a
timer, the timeout is dynamic
state members port aging
time
IGMP queries received
message
The port is removed from
the IGMP Snooping
multicast group
