Hirschmann MACH 4000 Series, User Manual

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Traffic control
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8.2 Multicast application
Basic - L3P
Release 3.1 06/07
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IGMP Querier
With “IGMP Querier active” you can switch the Query function on/
off.
The Protocol check boxes allow you to select IGMP version 1, 2 or
version 3.
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Unknown Multicasts
"Send to Query Ports", the Switch sends the packets with an
unknown MAC/IP multicast address to all query ports.
"Send to All Ports", the Switch sends the packets with an unknown
MAC/IP multicast address to all ports.
"Discard", the Switch discards all packets with an unknown MAC/IP
multicast address.
Note: The way in which unlearned multicast addresses are handled
also applies to the reserved addresses from the "Local Network Con-
trol Block" (224.0.0.0 - 224.0.0.255). This can have an effect on the
higher-level routing protocol.
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IGMP on per port
This table column enables you to switch on/off the IGMP for each
port when the global IGMP Snooping is switched on. When you
switch off the IGMP at a port, no registrations can be made for this
port.
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IGMP Forward All per port
This column of the table allows you to switch on/off the IGMP Snoo-
ping function “Forward All” when the global IGMP Snooping is swit-
ched on. With the “Forward All” setting, the Switch forwards all the
data packets with a Multicast address in the target address field to
this port.
Note: If a number of routers are connected to a subnetwork, then you
must use IGMP version 1, so that all the routers receive all the IGMP
reports.
Note: If you use IGMP version 1 in a subnetwork, then you must also
use IGMP version 1 in the entire network.