
Multicasting and Multimedia Overview
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IGMP Relay
A router configured as an IGMP Relay (IGMP-R) device provides the following
services for an IP multicast router:
• Solicits multicast group membership information by sending IGMP host
membership queries to hosts on its attached local networks
• Receives host membership reports and unsolicited join messages from hosts
on its attached networks and forwards them to the attached multicast router
• Forwards multicast data to group members on locally attached networks
For information about IGMP Relay, see Chapter 9.
Multicast Table Manager
The Multicast Table Manager (MTM) makes it possible for different multicast
protocols to work together on the same router. MTM does the following:
• Manages DVMRP and MOSPF
• Provides multicast routing support for RSVP
• Supports MOSPF special features
• Supports multicast tools for tracing routes
• Maintains a multicast forwarding cache
• Forwards multicast traffic
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