Multicast Addresses; Host Groups - HP 7102dl - ProCurve Secure Router Configuration Manual

Network 1
192.168.1.0/24
Figure 12-2. Multicasting

Multicast Addresses

The destination address in the IP header of a multicast message is the
multicast address. Only hosts that have joined the group for this multicast
address receive the message. (See Figure 12-2.)
Multicast addresses fall between 224.0.0.0 and 239.255.255.255. The addresses
between 224.0.0.0 and 224.0.0.255 are reserved for routing messages and are
intended for groups such as all routers on a subnet, all Open Shortest Path
First (OSPF) routers, or all Dynamic Host Configuration Protocol (DHCP)
servers. Private organizations can designate other multicast addresses for
their own purposes. Private multicast addresses for local networks range from
239.255.0.0 to 239.255.255.255. (For a list of multicast addresses, visit http://
www.iana.org/assignments/multicast-addresses.)

Host Groups

Network nodes forward multicast packets to the proper host group. The host
group for a multicast address is the set of hosts who receive messages sent to
that address. Group membership is dynamic. Hosts can join and leave a group.
They can belong to more than one group at once, and groups can contain any
number of hosts at any location in the network.
Configuring Multicast Support for a Stub Network
Packet destination
232.0.0.10
Switch
Router
Switch
Overview
12-5