H3C S5500-EI - Page 36

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Figure 12 IGMP snooping related ports
The following describes the ports involved in IGMP snooping:
• Router port—Layer 3 multicast device-side port. Layer 3 multicast devices include designated
routers (DRs) and IGMP queriers. In Figure 12, G
igabitEthernet 1/0/1 of Switch A and
GigabitEthernet 1/0/1 of Switch B are router ports. The switch registers all its 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 Figure 12, G
igabitEthernet 1/0/2 and
GigabitEthernet 1/0/3 of Switch A and GigabitEthernet 1/0/2 of Switch B are member ports. The
switch registers all its member ports 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.
NOTE:
A
n IGMP-snooping-enabled switch deems that all its ports on which IGMP
g
eneral queries with the source
IP address other than 0.0.0.0 or that receive PIM hello messages are received are dynamic router ports.
For more information about PIM hello messages, see "Configuring PIM (available only on the
S5500-E
I)."