3Com S7906E Configuration Manual page 53

Follow these steps to configure the storm constrain function on an Ethernet port:
To do...
Enter system view
Set the interval for generating
traffic statistics
Enter Ethernet port view
Enable the storm constrain
function and set the lower
threshold and the upper
threshold
Set the action to be taken when
the traffic exceeds the upper
threshold
Specify to send trap messages
when the traffic detected
exceeds the upper threshold or
drops down below the lower
threshold from a point higher
than the upper threshold
Specify to send log when the
traffic detected exceeds the
upper threshold or drops down
below the lower threshold from
a point higher than the upper
threshold
For network stability sake, configure the interval for generating traffic statistics to a value that is not
shorter than the default.
The storm constrain function, after being enabled, requires a complete statistical period (specified
by the storm-constrain interval command) to collect traffic data, and analyzes the data in the next
period. Thus, it is normal that a period longer than one statistic period is waited for a control action
to happen if you enable the function while the packet storm is present. However, the action will be
taken within two periods.
The storm constrain function is applicable to unicast packets, multicast packets, and broadcast
packets; and you can specify the upper and lower threshold for any of the three types of packets.
Use the command...
system-view
storm-constrain interval
seconds
interface interface-type
interface-number
storm-constrain { broadcast |
multicast | unicast } { pps |
kbps | ratio } max-pps-values
min-pps-values
storm-constrain control
{ block | shutdown }
storm-constrain enable trap
storm-constrain enable log
1-13
Remarks
—
Optional
10 seconds by default
—
Required
Disabled by default
Optional
Disabled by default
Optional
By default, the system sends
trap messages when the traffic
detected exceeds the upper
threshold or drops down below
the lower threshold from a point
higher than the upper
threshold.
Optional
By default, the system sends
log when the traffic detected
exceeds the upper threshold or
drops down below the lower
threshold from a point higher
than the upper threshold.