Hirschmann MACH 4000 Series, User Manual

Page: 129 / 236

Traffic control
Basic - L3P
Release 3.1 06/07
8.2 Multicast application
129
8.2.4 Description GMRP
The G ARP M ulticast R egistration P rotocol (GMRP) describes the distribution
of data packets with a multicast address as the target address on layer 2.
Devices that want to receive data packets with a multicast address as the
target address carry out the registration of the multicast address with the aid
of the GMRP. For a Switch, registration involves entering the multicast
address in the filter table. When a multicast address is entered in the filter
table, the Switch sends this information in a GMRP packet to all the ports.
Therefore the connected Switches know that they have to send this multicast
address to this Switch. The GMRP enables packets with a multicast address
in the target address field to be sent to the ports entered. The other ports are
not affected by these packets.
Data packets with unregistered multicast addresses are transmitted to all
ports by the Switch.
Default setting: “Global Configuration”: disabled.
8.2.5 Setting multicast applications
V
Select the
Switching:Multicasts
dialog.
U
Global Configuration
With “IGMP Snooping” check box you can switch IGMP Snooping
on/off globally for the entire Switch. If IGMP Snooping is switched
off, then:
D
the Switch does not evaluate Query and Report packets received
and
D
it sends (floods) received data packets with a Multicast address as
the target address to all ports.