
Configuring IP Multicasting and Multimedia Services
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IGMP Concepts and Terminology
The Internet Group Management Protocol (IGMP) allows hosts to communicate
their desired group memberships to their local queries router to receive any
datagrams sent to this router and targeted to a group with a specific IP multicast
address. Bay Networks routers support IGMP Version 2.
A router communicates with the hosts on a local network by sending IGMP
queries. Hosts respond by issuing IGMP reports.
This section covers the following topics:
IGMP Queries
A router running IGMP periodically sends host membership queries to its
attached local networks. Routers that conform to RFC 1112 generate Version 1
queries. Bay Networks routers configured with IGMP generate Version 2 queries.
If multiple IGMP routers exist on the network, Bay Networks routers designate
one router to send host member questions, using the following rules:
• Choose a router that generates Version 1 queries over a router that generates
Version 2 queries.
• Choose the router with the lowest IP address.
Topic Page
IGMP Queries 3-2
IGMP Host Reports 3-3
Host Leave Messages 3-3
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