Multicast Routing - Hirschmann MACH 4000 User Manual

Multicast Routing

9 Multicast Routing
Multicast data streams are data packets that a sender sends to multiple
recipients. To reduce the network load, the sender uses a Multicast address.
He thus sends each packet only once to the Multicast address instead
of sending it to each recipient individually. The recipients recognise a Multi-
cast data stream intended for them by the Multicast address.
A common reason for introducing subnetworks is the restriction of broadcast
data streams. Switches send broadcast/Multicast data streams to all ports,
while routers block broadcast/Multicast data streams. Multicast routing
enables you to accurately transmit Multicast data streams beyond the
boundaries of subnetworks. Accurate transmission means sending data
streams with defined Multicast addresses exclusively to those devices
which want to receive the Multicast data stream.
IP: 10.0.3.0/24
IP: 10.0.4.0/24
Multicast
IP: 10.0.1.0/24 IP: 10.0.2.0/24
Figure 32: Multicast routing requires:
Routing L3P
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Release 4.0 11/07