C
HAPTER
9
| Congestion Control
Automatic Traffic Control
– 258 –
u 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.
Figure 124: Storm Control by Shutting Down a Port
The key elements of this diagram are the same as that described in the
preceding diagram, except that automatic release of the control response
is not provided. When traffic control is applied, you must manually re-
enable the port.
Functional Limitations
Automatic storm control is a software level control function. Traffic storms
can also be controlled at the hardware level using Port Broadcast Control or
Port Multicast Control (as described on page 254). However, only one of
these control types can be applied to a port. Enabling automatic storm
control on a port will disable hardware-level storm control on that port.
SETTING THE ATC
TIMERS
Use the Traffic > Auto Traffic Control (Configure Global) page to set the
time at which to apply the control response after ingress traffic has
exceeded the upper threshold, and the time at which to release the control
response after ingress traffic has fallen beneath the lower threshold.
CLI REFERENCES
u "auto-traffic-control apply-timer" on page 1010
u "auto-traffic-control release-timer" on page 1010
COMMAND USAGE
u After the apply timer expires, the settings in the Traffic > Automatic
Traffic Control (Configure Interface) page are used to determine if a
control action will be triggered (as configured under the Action field) or
a trap message sent (as configured under the Trap Storm Fire field).
u The release timer only applies to a Rate Control response set in the
Action field of the ATC (Interface Configuration) page. When a port has
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