Hirschmann RS20 User Manual page 123

Network Load Control
 "IGMP Forward All"
This table column enables you to enable/disable the "Forward All"
IGMP Snooping function when the global IGMP Snooping is
enabled. With the "Forward All" setting, the device sends to this port
all data packets with a Multicast address in the destination address
field.
Note: If a number of routers are connected to a subnetwork, 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.
 "IGMP Automatic Query Port"
This table column shows you which ports the device has learned as
query ports, if "automatic" is selected in "Static Query Port".
 "Static Query Port"
The device sends IGMP Report messages to the ports on which it
receives IGMP requests (disabled=as-delivered state).
This table column also lets you send IGMP Report messages to:
other selected ports (enable) or
connected Hirschmann devices (automatic).

"Learned Query Port"
This table column shows you at which ports the device has received
IGMP queries, if "disable" is selected in "Static Query Port".
Note: If the device is incorporated into a HIPER-Ring, you can use the
following settings to quickly reconfigure the network for data packets
with registered Multicast destination addresses after the ring is
switched:

Switch on the IGMP Snooping on the ring ports and globally, and
 activate "IGMP Forward All" per port on the ring ports.
UM BasicConfig L2E
Release 8.0 05/2013
8.2 Multicast Application
123