Pilz PSSnet SHL 8T MRP - Manual (Page 106)

Network load control
PSSnet SHL - Basic Configuration
Pilz GmbH & Co. KG, Felix- Wankel Str. 2, 73760 Ostfildern
8.2 Multicast application
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8.2 Multicast application
8.2.1 Description of the Multicast application
The data distribution in the LAN differentiates between three distribution
classes on the basis of the addressed recipients:
X Unicast - one recipient
X Multicast - a group of recipients
X 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 require-
ment. Protocols such as GMRP and procedures such as IGMP Snooping en-
able the device to exchange information via the direct distribution 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 Multi-
cast packets are connected.
You can recognize IGMP Multicast addresses by the range in which the ad-
dress lies:
X MAC Multicast address 01:00:5E:00:00:00 - 01:00:5E:FF:FF:FF
X Class D IP Multicast address 224.0.0.0 - 239.255.255.255