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MSAP2000 AAMS User's Guide
This chapter describes the IGMP Snooping screen.
9.1 IGMP Snooping
IGMP (Internet Group Multicast Protocol) is a session-layer protocol used to
establish membership in a multicast group - it is not used to carry user data.
Refer to RFC 1112 and RFC 2236 for information on IGMP versions 1 and 2
respectively.
A switch can passively snoop on IGMP Query, Report and Leave (IGMP version 2)
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 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. The switch discards multicast traffic destined for
multicast groups that it does not know. IGMP snooping generates no additional
network traffic, allowing you to significantly reduce multicast traffic passing
through your switch.
9.2 IGMP Snooping Screen
Click Advanced Application and then IGMP Snooping in the navigation panel to
display the IGMP Snooping screen as shown next. Use this screen to turn IGMP
snooping off or on and view information collected by IGMP snooping.
Figure 42
IGMP Snooping
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IGMP Snooping
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