Multicast, RFC 112, then RFC 2236

  • sending ip packets to a group of hosts in the network, RFC 2236 Internet Group Management Protocol v2
  • delivery of IP datagramms to multiple hosts using a single destination address
  • dynamic membership to groups, clients can dynamicly join groups
  • supports all size of groups

single group address for registred applications, that means multiple applications can stream to a single group address

Addressing

Address range:

Multicast uses Class D

224.0.0.0 – 239.255.255.255

Well-known Addresses:

  • 224.0.0.1 All hosts on a subnet
  • 224.0.0.2 All routers on a subnet
  • 224.0.0.4 All distance vector multicast routing protocol routers
  • 224.0.0.5 All OSPF routers
  • 224.0.0.6 All OSPF designated routers
  • 224.0.0.9 All RIP designated routers
  • 224.0.0.10 IGRP router
  • 224.0.0.13 All Protocl independent Multicast (PIM) routers

To configure a router supporting PIM, the cisco way of supporting multicast, you have to enable ip multicast-routing

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