Allied Telesis AT-9000 Series - Manual (Page 438)

Chapter 24: IGMP Snooping Commands
410
IP IGMP SNOOPING FLOOD-UNKNOWN-MCAST
Syntax
ip igmp snooping flood-unknown-mcast
Parameter
None
Mode
Global Configuration mode
Description
This command disables the automatic suppression of unknown multicast
traffic on the switch. By default, IGMP Snooping does not suppress all
unknown multicast traffic except for IPv4 reserved addresses 224.0.0.1
through 224.0.0.255. When you enable the IP IGMP SNOOPING FLOOD-
UNKNOWN-MCAST command, all unknown multicast traffic is flooded
before a join message. Once a join message occurs for a particular
multicast destination, it is no longer “unknown” and, therefore, no longer
floods.
Use the no version of this command, NO IP IGMP SNOOPING FLOOD-
UNKNOWN-MCAST, to enable the automatic suppression of unknown
multicast traffic on the switch.
Caution
The IP IGMP SNOOPING FLOOD-UNKNOWN-MCAST command
is enabled by default when IGMP Snooping is activated. This may
cause a slow-down of network data. If you want to disable flooding
of unknown multicast packets, you must enter the NO IP IGMP
SNOOPING FLOOD-UNKNOWN-MCAST command.
Confirmation Command
“SHOW IP IGMP SNOOPING” on page 416
Examples
This example disables the automatic suppression of unknown multicast
traffic on the switch: