5
ROUTING WITH IP MULTICAST
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.
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