Brocade Communications Systems Brocate Ethernet Access Switch 6910 - Manual (Page 834)

784 Brocade 6910 Ethernet Access Switch Configuration Guide
53-1002581-01
Automatic Traffic Control
37
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.
CLI References
• “Automatic Traffic Control Commands” on page 313
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 133 Storm Control by Limiting the Traffic Rate
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
page 786 ).
• 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 manually.
Storm Alarm
Fire TRAP
Alarm Fire
Threshold
（1～255kpps）
AlarmClear
Threshold
（1～255kpps）
Traffic
[kpps]
Time
Traffic without storm control
Traffic with storm control
Apply Timer
expired
(0～300sec)
Auto Storm Control
Release Timer
expired
(0～300sec)
Storm Alarm
Fire TRAP
StromAlarm
ClearTRAP
TrafficControl
Apply Trap
StromAlarm
ClearTRAP
TrafficControl
Release Trap
Storm Alarm
Fire TRAP
Alarm Fire
Threshold
（1～255kpps）
AlarmClear
Threshold
（1～255kpps）
Traffic
[kpps]
Time
Traffic without storm control
Traffic with storm control
Apply Timer
expired
(0～300sec)
Auto Storm Control
Release Timer
expired
(0～300sec)
Storm Alarm
Fire TRAP
StromAlarm
ClearTRAP
TrafficControl
Apply Trap
StromAlarm
ClearTRAP
TrafficControl
Release Trap