Chapter 8
| Congestion Control
Automatic Traffic Control
Automatic Traffic Control
4.
Set the required threshold beyond which the switch will start dropping
packets.
5.
Click Apply.
Figure 129: Configuring Storm 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.
Command Usage
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 130: Storm Control by Limiting the Traffic Rate
Storm Alarm
Storm Alarm
Traffic
Traffic
Fire TRAP
Fire TRAP
[kpps]
[kpps]
StromAlarm
StromAlarm
Alarm Fire
Alarm Fire
ClearTRAP
ClearTRAP
Threshold
Threshold
(1~255kpps )
(1~255kpps )
AlarmClear
AlarmClear
Threshold
Threshold
(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.
TrafficControl
TrafficControl
Apply Trap
Apply Trap
Storm Alarm
Storm Alarm
Fire TRAP
Fire TRAP
Apply Timer
Apply Timer
expired
expired
Auto Storm Control
Auto Storm Control
(0~300sec)
(0~300sec)
– 234 –
Traffic without storm control
Traffic without storm control
Traffic with storm control
Traffic with storm control
StromAlarm
StromAlarm
ClearTRAP
ClearTRAP
TrafficControl
TrafficControl
Release Trap
Release Trap
Release Timer
Release Timer
expired
expired
(0~300sec)
(0~300sec)
Time
Time