
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 MOSPF AS boundary 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 attached networks and forwards them to the MOSPF boundary 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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