TP-Link T1600G-28PS Jetstream Smart Switches User Guide - Page 235
IGMP Querier, Snooping Switch, Router Port, Member Port, one multicast router in the network
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Configuring Layer 2 Multicast Layer 2 Multicast Demonstrated as below: Figure 1-1 IGMP Snooping Multicast packets transmission without IGMP Snooping IGMP Querier Multicast packets transmission with IGMP Snooping IGMP Querier Source Non-Snooping Switch Source Router Port Member Port Snooping Switch Member Port Host A Receiver Host B Multicast packets Host C Receiver Host A Receiver Host B Host C Receiver The following basic concepts of IGMP Snooping will be introduced: IGMP querier, snooping switch, router port and member port. IGMP Querier An IGMP querier is a multicast router (a router or a Layer 3 switch) that sends query messages to maintain a list of multicast group memberships for each attached network, and a timer for each membership. Normally only one device acts as querier per physical network. If there are more than one multicast router in the network, a querier election process will be implemented to determine which one acts as the querier. Snooping Switch A snooping switch indicates a switch with IGMP Snooping enabled. The switch maintains a multicast forwarding table by snooping on the IGMP transmissions between the host and the querier. With the multicast forwarding table, the switch can forward multicast data only to the ports that are in the corresponding multicast group, so as to constrain the flooding of multicast data in the Layer 2 network. Router Port A router port is a port on snooping switch that is connecting to the IGMP querier. Member Port A member port is a port on snooping switch that is connecting to the host. User Guide 210
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