C
HAPTER
9
| Congestion Control
Automatic Traffic Control
– 235 –
CONFIGURING ATC
THRESHOLDS AND
RESPONSES
Use the Traffic > Congestion Control > Auto Traffic Control (Configure
Interface) page to set the storm control mode (broadcast or multicast), the
traffic thresholds, the control response, to automatically release a response
of rate limiting, or to send related SNMP trap messages.
CLI REFERENCES
â—† "Automatic Traffic Control Commands" on page 773
PARAMETERS
These parameters are displayed:
◆ Storm Control – Specifies automatic storm control for broadcast
traffic or multicast traffic.
Automatic storm control can be enabled for either broadcast or
multicast traffic. It cannot be enabled for both of these traffic types at
the same time.
◆ Port – Port identifier.
◆ State – Enables automatic traffic control for broadcast or multicast
storms. (Default: Disabled)
Automatic storm control is a software level control function. Traffic
storms can also be controlled at the hardware level using the Storm
Control menu. However, only one of these control types can be applied
to a port. Enabling automatic storm control on a port will disable
hardware-level storm control on that port.
◆ Action – When the Alarm Fire Threshold (upper threshold) is exceeded
and the apply timer expires, one of the following control responses will
be triggered.
â–
Rate Control
– The rate of ingress traffic is limited to the level set
by the Alarm Clear Threshold. Rate limiting is discontinued only
after the traffic rate has fallen beneath the Alarm Clear Threshold
(lower threshold), and the release timer has expired. (This is the
default response.)
â–
Shutdown
– The port is administratively disabled. A port disabled
by automatic traffic control can only be manually re-enabled using
the Manual Control Release attribute.
◆ Auto Release Control – Automatically stops a traffic control response
of rate limiting when traffic falls below the alarm clear threshold and
the release timer expires as illustrated in Figure 109 on page 232.
When traffic control stops, the event is logged by the system and a
Traffic Release Trap can be sent. (Default: Disabled)
If automatic control release is not enabled and a control response of
rate limiting has been triggered, you can manually stop the rate limiting
response using the Manual Control Release attribute. If the control
response has shut down a port, it can also be re-enabled using Manual
Control Release.
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