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Configuring IP Services
7-2
Host Groups
Multicasting defines two categories of host groups: permanent and transient.
•A permanent host group has a well-known, administratively assigned IP
multicast group address. It is the address, not the membership, that is
permanent and defines the group. A permanent host group can consist of zero
or more members.
•A transient host group exists only as long as it has members that need its
services. IP addresses in the multicast range that are not reserved for
permanent groups are available for dynamic assignment to transient host
groups.
An IP host group places no restrictions on its membership. Host members can
reside anywhere; they can join and leave the group at any time; and they can be
members of more than one group at the same time. In order to receive a multicast
message from a host group, a host must be a member of the group; however, a host
need not be a member of a group to send a multicast message to its members.
In general, hosts that are members of the same group are located on different
networks. However, a range of multicast addresses (224.0.0.x) is reserved for
groups that are locally scoped. All message traffic for these hosts remains on the
local network. Hosts that belong to a group in this address range and that reside in
different networks will not receive each other’s message traffic.
Multicast Networks and Multicast Source Networks
A multicast network can support the sending and receiving of multicast
datagrams. The hosts on this network may or may not be members of various
multicast host groups.
A multicast source network contains hosts that can (but may or may not) send
multicast packets. These hosts may or may not ever be members of a host group.
Note: Multicast data packets are affected by traffic filters. The network
administrator must ensure that traffic filters configured on a multicast router
do not prevent a host that is a member of a group from receiving packets
intended for that group.
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