Automatic Traffic Control - Edge-Core ECS3510-26P Management Manual

26-port fast ethernet layer 2 switch

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| Congestion Control

Automatic Traffic Control

Use the Traffic > Congestion Control > Auto Traffic Control pages to

configure bounding thresholds for broadcast and multicast storms which

can automatically trigger rate limits or shut down a port.

"Automatic Traffic Control Commands" on page 773

ATC includes storm control for broadcast or multicast traffic. The control

response for either of these traffic types is the same, as shown in the

following diagrams.

Figure 109: Storm Control by Limiting the Traffic Rate

（1～255kpps ）

（1～255kpps ）

The key elements of this diagram are described below:

Alarm Fire Threshold – The highest acceptable traffic rate. When

ingress traffic exceeds the threshold, ATC sends a Storm Alarm Fire

Trap and logs it.

When traffic exceeds the alarm fire threshold and the apply timer

expires, a traffic control response is applied, and a Traffic Control Apply

Trap is sent and logged.

Alarm Clear Threshold – The lower threshold beneath which a control

response can be automatically terminated after the release timer

expires. When ingress traffic falls below this threshold, ATC sends a

Storm Alarm Clear Trap and logs it.

When traffic falls below the alarm clear threshold after the release

timer expires, traffic control (for rate limiting) will be stopped and a

Traffic Control Release Trap sent and logged. Note that if the control

action has shut down a port, it can only be manually re-enabled using

Manual Control Release (see

TrafficControl

Auto Storm Control

Traffic without storm control

Traffic with storm control

TrafficControl

Release Trap

Release Timer

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