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Igmp snooping related ports – H3C Technologies H3C WX6000 Series Access Controllers User Manual

Page 174

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24-2

Figure 24-1 Multicast forwarding before and after IGMP snooping runs

Multicast packet transmission

without IGMP Snooping

Source

Multicast router

Host A

Receiver

Host B

Host C

Receiver

Multicast packets

Layer 2 switch

Multicast packet transmission

when IGMP Snooping runs

Source

Multicast router

Host A

Receiver

Host B

Host C

Receiver

Layer 2 switch

IGMP Snooping Related Ports

As shown in

Figure 24-2

, Router A connects to the multicast source, IGMP snooping runs on Switch A

and Switch B, Host A and Host C are receiver hosts (namely, multicast group members).

Figure 24-2 IGMP snooping related ports

Router A

Switch A

Switch B

Eth1/1

Eth1/2

Eth1/3

Eth1/1

Eth1/2

Receiver

Receiver

Host A

Host B

Host C

Host D

Source

Multicast packets

Router port

Member port

IGMP snooping related ports include:

Router port: A router port is a port on an Ethernet switch that leads the switch towards the Layer 3

multicast device (DR or IGMP querier). In the figure, Ethernet 1/1 of Switch A and Ethernet 1/1 of

Switch B are router ports. A switch registers all its local router ports in its router port list.

Member port: On an Ethernet switch, a member port (also known as multicast group member port)

connects the switch to a multicast group member. In the figure, Ethernet 1/2 and Ethernet 1/3 of Switch