IGMP snooping ports

As shown in Figure 12, IGMP snooping runs on Switch A and Switch B, and Host A and Host C are receivers in a multicast group. IGMP snooping ports are divided into member ports and router ports.

Figure 12: IGMP snooping ports

Router ports

On an IGMP snooping Layer 2 device, the ports toward Layer 3 multicast devices are called router ports. In Figure 12, Port A1 of Switch A and Port B1 of Switch B are router ports.

Router ports contain the following types:

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 a Layer 2 interface.

Member ports

On an IGMP snooping Layer 2 device, the ports toward receiver hosts are called member ports. In Figure 12, Port A2 and Port A3 of Switch A and Port B2 of Switch B are member ports.

Member ports contain the following types:

Unless otherwise specified, router ports and member ports in this document include both static and dynamic router ports and member ports.