C613-50631-01 Rev A Command Reference for IE340 Series 593
AlliedWare Plus™ Operating System - Version 5.5.3-0.x
SWITCHING COMMANDS
PLATFORM
STOP-UNREG-MC-FLOODING
platform stop-unreg-mc-flooding
Overview If a multicast stream is arriving at a network device, and that network device has
received no IGMP reports that request the receipt of the stream, then that stream
is referred to as "unregistered". IGMP snooping actively prevents the flooding of
unregistered streams to all ports in the VLAN on which the stream is received.
However, there are brief moments at which this prevention is not in operation, and
an unregistered stream may be briefly flooded. This command stops this flooding
during even those brief periods when IGMP snooping is not explicitly preventing
the flooding.
Use the no variant of this command to revert to default behavior and disable this
feature.
NOTE: This command should not be used within any IPv6 networks. IPv6 neighbor
discovery operation is inhibited by this feature.
This command does not affect the flooding of Local Network Control Block IPv4
multicast packets in the address range 224.0.0.1 to 224.0.0.255 (224.0.0/24). Such
packets will continue to be uninterruptedly flooded, as they need to be.
Syntax
platform stop-unreg-mc-flooding
no platform stop-unreg-mc-flooding
Default This feature is disabled by default.
Mode Global Configuration
Usage notes This command stops the periodic flooding of unknown or unregistered multicast
packets when the Group Membership interval timer expires and there are no
subscribers to a multicast group. If there is multicast traffic in a VLAN without
subscribers, multicast traffic temporarily floods out of the VLAN when the Group
Membership interval timer expires, which happens when the switch does not get
replies from Group Membership queries.
This command also stops the initial flood of multicast packets that happens when
a new multicast source starts to send traffic. This flooding lasts until snooping
realises that this the multicast group is arriving at the switch, and puts an entry into
hardware to prevent it from being flooded.
This command is useful in networks where low-performance devices are attached.
The operation of such devices can be impaired by them receiving unnecessary
streams of traffic. For example, in sites where IP cameras are in use, the flooding of
video streams to a whole VLAN can send enough traffic to the cameras to cause
interruption of their video streaming.
Do not use this command in IPv6 networks. The following console message is
displayed after entering this command to warn you of this:
% WARNING: IPv6 will not work with this setting enabledď€
% Please consult the documentation for more information
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