GS1510 Series User’s Guide
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CHAPTER 12
IGMP Snooping
12.1 Overview
This chapter shows you how to configure IGMP snooping for multicast traffic. The
Switch 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 Switch to learn multicast groups without
you having to manually configure them.
12.2 What You Can Do
•Use the General Settings screen (Section 12.4 on page 74) to enable IGMP
snooping.
•Use the Port Settings screen (Section 12.5 on page 75) to enable or disable
immediate leave on ports.
12.3 What You Need to Know
The Switch 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 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.
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