ZyXEL Communications XS3800-28, User Manual, Page: 721 / 789

Chapter 88 Networked AV Mode
XS3800-28 User’s Guide
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88.27 IGMP Snooping
A Switch can passively snoop on IGMP packets transferred between IP multicast routers or switches and
IP multicast hosts to learn the IP multicast group membership. It checks IGMP packets passing through it,
picks out the group registration information, and configures multicasting accordingly. IGMP snooping
allows the Switch to learn multicast groups without you having to manually configure them.
The Switch forwards multicast traffic destined for multicast groups (that it has learned from IGMP
snooping or that you have manually configured) to ports that are members of that group. IGMP
snooping generates no additional network traffic, allowing you to significantly reduce multicast traffic
passing through your Switch.
Click SWITCHING > Multicast > IGMP Snooping to display the screen as shown.
Figure 575 SWITCHING > Multicast > IGMP Snooping