C
HAPTER
9
| Congestion Control
Automatic Traffic Control
– 268 –
◆ 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 125 on page 264.
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.
◆ Alarm Fire Threshold – The upper threshold for ingress traffic beyond
which a storm control response is triggered after the Apply Timer
expires. (Range: 1-500 packets per second; Default: 250 pps)
Once the traffic rate exceeds the upper threshold and the Apply Timer
expires, a trap message will be sent if configured by the Trap Storm
Fire attribute.
◆ Alarm Clear Threshold – The lower threshold for ingress traffic
beneath which a control response for rate limiting will be released after
the Release Timer expires, if so configured by the Auto Release Control
attribute. (Range: 1-500 packets per second; Default: 250 pps)
If rate limiting has been configured as a control response and Auto
Control Release is enabled, rate limiting will be discontinued after the
traffic rate has fallen beneath the lower threshold, and the Release
Timer has expired. Note that if a port has been shut down by a control
response, it will not be re-enabled by automatic traffic control. It can
only be manually re-enabled using Manual Control Release.
Once the traffic rate falls beneath the lower threshold and the Release
Timer expires, a trap message will be sent if configured by the Trap
Storm Clear attribute.
◆ Trap Storm Fire – Sends a trap when traffic exceeds the upper
threshold for automatic storm control. (Default: Disabled)
◆ Trap Storm Clear – Sends a trap when traffic falls beneath the lower
threshold after a storm control response has been triggered.
(Default: Disabled)
◆ Trap Traffic Apply – Sends a trap when traffic exceeds the upper
threshold for automatic storm control and the apply timer expires.
(Default: Disabled)
◆ Trap Traffic Release – Sends a trap when traffic falls beneath the
lower threshold after a storm control response has been triggered and
the release timer expires. (Default: Disabled)
◆ Manual Control Release – Manually releases a control response of
rate-limiting or port shutdown any time after the specified action has
been triggered.
If this function is enabled for any port, clicking Apply with manually
release the control response, and clear the check box.
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