Platform stop-unreg-mc-flooding – Allied Telesis AlliedWare Plus Operating System Version 5.4.4C (x310-26FT,x310-26FP,x310-50FT,x310-50FP) User Manual
Page 386
Switching Commands
Software Reference for x310 Series Switches
15.24
AlliedWare Plus
TM
Operating System - Version 5.4.4C
C613-50046-01 REV A
platform stop-unreg-mc-flooding
This command stops multicast packets flooding out of all the ports in the VLAN until these
packets are registered. This command does this by sending unregistered multicast packets
to the switch processor, so there is no flooding of the multicast traffic onto the VLAN.
Unregistered traffic will not flow until the switch has registered it, regardless of attempts
to subscribe to it. Once the traffic is registered, it flows to registered subscribers and ports.
Use the no variant of this command to revert to default behavior and disable this feature.
Syntax
platform stop-unreg-mc-flooding
no platform stop-unreg-mc-flooding
Default
This feature is disabled by default.
Mode
Global Configuration
Usage
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.
For further information about query messages see the
Staying in the multicast group
section in
Chapter 30, IGMP and IGMP Snooping Introduction
.
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 recognizes the
multicast group. For example, in sites where IP cameras have multicast groups, traffic is
flooded to the VLAN and causes large bursts of traffic. Use this command when there is
limited processing available for large bursts of traffic, such as in sites with IP cameras.
Output
See the console message warning about IPv6 operation after entering this command:
See these sample console messages when the Group Membership interval timer expires,
which happens when the switch does not get replies from Group Membership queries:
Note
This command should not be used within any IPv6 networks.
IPv6 neighbor discovery operation is inhibited by this feature.
This command does not stop reserved Local Network Control Block IPv4
multicast packets in the address range 224.0.0.1 to 224.0.0.255 (224.0.0/24).
% WARNING: IPv6 will not work with this setting enabled
% Please consult the documentation for more information
awplus: [MLD-EVENTS] Grp - Rec Liveness Timer: Expiry for Grp ff0e::1 on port1.2.7
awplus: [IGMP-EVENTS] : Expiry (Unreg MC Timer) for Grp 224.2.2.2 on vlan4