Network Load Control
UM Basic Configuration L3P
Release
7.1
12/2011
8.2
Multicast Application
153
8.2 Multicast Application
8.2.1 Description of the Multicast Application
The data distribution in the LAN differentiates between 3 distribution classes
on the basis of the addressed recipients:
Unicast - one recipient
Multicast - a group of recipients
Broadcast - every recipient that can be reached
In the case of a Multicast address, the device forwards all data packets with
a Multicast address to all ports. This leads to an increased bandwidth
requirement.
Protocols such as GMRP and procedures such as IGMP Snooping enable
the device to exchange information via the direct transmission of Multicast
data packets. The bandwidth requirement can be reduced by distributing the
Multicast data packets only to those ports to which recipients of these
Multicast packets are connected.
You can recognize IGMP Multicast addresses by the range in which the
address lies:
MAC Multicast Address
01:00:5E:00:00:00 - 01:00:5E:FF:FF:FF
(in mask form 01:00:5E:00:00:00/24)
Class D IP Multicast address
224.0.0.0 - 239.255.255.255
(in mask form 224.0.0.0/4)
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