ZyXEL ES-2024A User Manual download pdf (Page 49)

ES-2000 Series Switch Support Notes

IP Multicasting

How to setup IGMP snooping in your switch?

Figure 1: IGMP and IGMP snooping

IGMP snooping is designed for application with deployment of 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 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 multicast group information without manually configuring switches.

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ZyXEL ES-2024A User Manual Page 49