ZyXEL Communications VES-1616 manual IP Multicasting Configuring Igmp snooping in your switch

ZyXEL VES-1616/24FA-5x Series Support Notes

IP Multicasting

Configuring IGMP snooping in your switch

Video	Multicast
server	Traffic

IGMP

Router

Enable IGMP Snooping

Receiver Receiver Receiver Not a Receiver

IGMP snooping is designed for scenarios with multicast traffic.

It operates on the underlying IGMP mechanism where a layer two switch passively listens to the IGMP Query, Report and Leave (IGMP version 2) packets transmitted between the IGMP router and clients and collects passing IGMP messages. After that, the switch records the message’s group registration information, and configures the multicasting information accordingly. If the multicast group information is unknown (not recorded on the switch), the switch discards that multicast traffic. Only the registered clients that join the group will receive multicast stream from the IGMP router. Thus this significantly reduces the multicast traffic forwarded down to the clients.

Another advantage of IGMP snooping is to allow the intermediate switch to learn

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