Luxul XMS-1024P - Manual (Page 116)

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XMS-1024P
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LUX-UG-XMS-1024P Vers: 081314
8 MULTICAST
Multicast Overview
Packets are transmitted in one of three modes: Unicast, Broadcast and Multicast. In
Unicast the Source transmits information to a single destination device. When a large
number of devices require this information, the Server must send Data with the same
content to multiple devices-occupying large amounts of bandwidth. In Broadcast, the
system transmits information to all devices in a Broadcast Domain (Hub, Switch, Access
Point, etc…). All devices in the Broadcast Domain receive the Data with no regard to
whether or not it is needed.
In Multicast, the Source transmits to multiple devices using a Multicast address which
allows the Client devices to listen and grab the Multicast packets without the Server
having to target individual client devices. Suppose you have a point to multi-point
presentation, Unicast is suitable for Networks with a small number of client devices,
Multicast is much more effi cient in Networks with a high number of client devices.
When the number of client devices requiring this information is variable unicast is very
ineffi cient. Multicast solves this problem as well. It is extremely effi cient sending Data
in the point to multi-point format. Multicast can save large amounts of bandwidth and
reduce the Network load. In Multicast, the packets are transmitted in the following
manner as shown in Figure 8-1.
Figure 8-1 Information transmission in the Multicast mode Features of Multicast: