3Com CoreBuilder 2500 User Manual - Outing
5
R
OUTING
WITH
IP M
ULTICAST
This chapter describes the IP multicast routing implementation on the
CoreBuilder
™
2500 system. It includes these sections:
■
About IP Multicast Routing
■
IGMP
■
DVMRP
■
Multicast Routing Algorithms
■
Multicast Interfaces
■
Multicast Tunnels
About IP Multicast
Routing
IP multicast routing is an extension of the Internet Protocol. With
multicast routing, a router or switch sends packets to a specific group of
hosts without using broadcasts or multiple unicast transmissions.
Multicast destinations include:
■
Hosts that reside on the local LAN
■
Hosts that reside on different sites within a private network
■
Hosts that are scattered throughout the Internet
Multicast routing operates without loops or excess transmissions.
The CoreBuilder 2500 system supports two IP multicast protocols:
■
Internet Group Management Protocol (IGMP)
■
Distance Vector Multicast Routing Protocol (DVMRP)
This chapter describes these protocols and the algorithms that the
CoreBuilder 2500 system uses for multicast routing.