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H A P T E R
13.1 Overview
This chapter shows you how to configure IGMP snooping for multicast traffic. The
P-794H can passively snoop on IGMP packets transferred between IP multicast
routers/switches and IP multicast hosts to learn the IP multicast group
membership. IGMP snooping allows the P-794H to learn multicast groups without
you having to manually configure them.
13.1.1 What You Need to Know
IGMP
IGMP (Internet Group Management Protocol) is a network-layer protocol used to
establish membership in a multicast group - it is not used to carry user data. Refer
to RFC 1112, RFC 2236 and RFC 3376 for information on IGMP versions 1, 2 and 3
respectively.
IGMP Snooping
A P-794H can passively snoop on IGMP packets transferred between IP multicast
routers/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 P-794H to learn multicast groups without you having to manually
configure them.
The P-794H 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
P-794H.
P-794H User's Guide
IGMP Snooping
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