Chapter 8
| Congestion Control
Automatic Traffic Control
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◆ 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 124 on page 206. 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: 1-255
kilo-packets per second; Default: 128 Kpps)
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: 1-255
kilo-packets per second; Default: 128 Kpps)
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 will manually release the
control response, and clear the check box.
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