IGMP Snooping Overview

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Snooping is a general way for a Layer 2 device, such as an MX-series router, to implement a series of procedures to “snoop” at the Layer 3 packet content to determine which actions should be taken to process or forward a frame. More specific forms of snooping, such as Internet Group Membership Protocol (IGMP ) snooping or Protocol Independent Multicast (PIM) snooping, are used with multicast.

For more information about Layer 2 and multicast addressing, see Layer 2 Frames and Multicast. For more information about multicast snooping in general, see Overview of Multicast Snooping.

This chapter investigates the following topics about IGMP snooping on MX-series routers:

Introduction to IGMP Snooping
IGMP Snooping Interfaces and Forwarding
IGMP Snooping and Proxies
IGMP Snooping and Bridge Domains

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