Edge-Core ECS4210-12P Reference Manual page 398

12/28-port gigabit ethernet layer 2 switch

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| Congestion Control Commands

Automatic Traffic Control Commands

Usage Guidelines

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 1: 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

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 the

The traffic control response of rate limiting can be released automatically or

manually. The control response of shutting down a port can only be released

TrafficControl

Auto Storm Control

Traffic without storm control

Traffic with storm control

TrafficControl

Release Trap

Release Timer

auto-traffic-control control-

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