Technical information

AX Series L2 Loop Detection Configuration Guide (Edition 2)
Copyright © 2008, 2010, ALAXALA Networks Corporation. All rights reserved.
10
1.5 Storm control
(1) Functionality overview
Storm control refers to the functionality that limits the number of flooded frames that are forwarded by a switch
to control the impact of storms on the network and connected devices.
Even if a broadcast storm occurs due to an L2 loop created by accident, its bandwidth is limited to the value
specified with the storm control functionality, which can reduce the impact on other normal communication to
some extent.
(2) Operation
The occurrence of a storm is determined when the receiver bandwidth of the frame type subject to the storm
control exceeds the value specified in the configuration section. The following three frame types are subject to
storm control:
- Broadcast frames
- Multicast frames
- Unicast flooding frames
After a storm is detected, the receiver bandwidth of the target frame is limited. The following behaviors can also
be selected depending on the configuration:
- Blocking the target port
- Outputting a log message
- Issuing an SNMP trap
(3) Description of configuration parameter
Table 1.5-1 Configurations related to storm control (AX6700S/6300S series)
Parameter Description
Configured in global configuration mode (config)
storm-control broadcast
Enables storm control for broadcast frames.
storm-control multicast
Enables storm control for multicast frames.
storm-control unicast
Enables storm control for flooded unicast frames.
Configured in interface configuration mode (config-if)
storm-control level
Sets the threshold value for the receiver bandwidth for storm
control. Frames exceeding the threshold are discarded.
storm-control action
inactivate
Blocks the port when a storm is detected.
storm-control action trap
Issues an SNMP trap when a storm is detected and when a storm
ends.
storm-control action log
Outputs a log message when a storm is detected and when a
storm ends.
#1: To use the storm control functionality with the AX6700S/6300S series, it is required to specify
upc-in-and-storm-control using the upc-storm-control mode command beforehand.