CLI Reference Guide-R04

Chapter 14 | Congestion Control Commands
Automatic Traffic Control Commands
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Command Usage
◆ When traffic exceeds the threshold specified for broadcast and multicast or
unknown unicast traffic, packets exceeding the threshold are dropped until the
rate falls back down beneath the threshold.
◆ Traffic storms can be controlled at the hardware level using this command or at
the software level using the auto-traffic-control command. However, only one
of these control types can be applied to a port. Enabling hardware-level storm
control on a port will disable automatic storm control on that port.
◆ The rate limits set by this command are also used by automatic storm control
when the control response is set to rate limiting by the auto-traffic-control
action command.
◆ Using both rate limiting and storm control on the same interface may lead to
unexpected results. It is therefore not advisable to use both of these commands
on the same interface.
Example
The following shows how to configure broadcast storm control at 600 kilobits per
second:
Console(config)#interface ethernet 1/5
Console(config-if)#switchport broadcast packet-rate 600
Console(config-if)#
Automatic Traffic Control Commands
Automatic Traffic Control (ATC) configures bounding thresholds for broadcast and
multicast storms which can be used to trigger configured rate limits or to shut
down a port.
Table 88: ATC Commands
Command Function Mode
Threshold Commands
auto-traffic-control
apply-timer
Sets the time at which to apply the control response
after ingress traffic has exceeded the upper
threshold
GC
auto-traffic-control
release-timer
Sets the time at which to release the control
response after ingress traffic has fallen beneath the
lower threshold
GC
auto-traffic-control
*
Enables automatic traffic control for broadcast or
multicast storms
IC (Port)
auto-traffic-control
action
Sets the control action to limit ingress traffic or shut
down the offending port
IC (Port)
auto-traffic-control
alarm-clear-threshold
Sets the lower threshold for ingress traffic beneath
which a cleared storm control trap is sent
IC (Port)