H3C Technologies H3C S7500E Series Switches - Manual (Page 35)

2-3
Figure 2-2 IGMP snooping related ports
Router A Switch A
Switch B
GE2/0/1 GE2/0/2
GE2/0/3
GE2/0/1
GE2/0/2
Receiver
Receiver
Host A
Host B
Host C
Host D
Source
Multicast packets
Router port
Member port
Ports involved in IGMP snooping, as shown in Figure 2-2 , are described as follows:
z Router port: A router port is a port on an Ethernet switch that leads the switch towards a
Layer 3 multicast device (DR or IGMP querier). In the figure, GigabitEthernet 2/0/1 of
Switch A and GigabitEthernet 2/0/1 of Switch B are router ports. The switch registers all its
local router ports in its router port list.
z Member port: A member port is a port on an Ethernet switch that leads the switch towards
multicast group members. In the figure, GigabitEthernet 2/0/2 and GigabitEthernet 2/0/3 of
Switch A and GigabitEthernet 2/0/2 of Switch B are member ports. The switch registers all
the member ports on the local device in its IGMP snooping forwarding table.
z Whenever mentioned in this document, a router port is a port on the switch that leads the
switch to a Layer 3 multicast device, rather than a port on a router.
z Unless otherwise specified, router/member ports mentioned in this document include static
and dynamic ports.
z An IGMP-snooping-enabled switch deems that all its ports on which IGMP general queries
with the source IP address other than 0.0.0.0 or PIM hello messages are received are
dynamic router ports. For details about PIM hello messages, see PIM Configuration of the
IP Multicast Configuration Guide.