Brocade FastIron Ethernet Switch Administration Guide - Manual (Page 78)

Configuring port flap dampening on an interface
This feature is configured at the interface level.
device(config)# interface ethernet 2/1
device(config-if-e10000-2/1)# link-error-disable 10 3 10
Syntax: [no] link-error-disable toggle-threshold sampling-time-in-sec wait-time-in-sec
The toggle-threshold is the number of times a port link state goes from up to down and down to up
before the wait period is activated. Enter a value from 1 - 50.
The sampling-time-in-sec is the amount of time during which the specified toggle threshold can occur
before the wait period is activated. The default is 0 seconds. Enter 1 - 65535 seconds.
The wait-time-in-sec is the amount of time the port remains disabled (down) before it becomes
enabled. Enter a value from 0 - 65535 seconds; 0 indicates that the port will stay down until an
administrative override occurs.
Configuring port flap dampening on a trunk
You can configure the port flap dampening feature on the primary port of a trunk using the link-error-
disable command. Once configured on the primary port, the feature is enabled on all ports that are
members of the trunk. You cannot configure port flap dampening on port members of the trunk.
Enter commands such as the following on the primary port of a trunk.
device(config)# interface ethernet 2/1
device(config-if-e10000-2/1)# link-error-disable 10 3 10
Re-enabling a port disabled by port flap dampening
A port disabled by port flap dampening is automatically re-enabled once the wait period expires;
however, if the wait period is set to zero (0) seconds, you must re-enable the port by entering the
following command on the disabled port.
device(config)# interface ethernet 2/1
device(config-if-e10000-2/1)# no link-error-disable 10 3 10
Displaying ports configured with port flap dampening
Ports that have been disabled due to the port flap dampening feature are identified in the output of the
show link-error-disable command. The following shows an example output.
device# show link-error-disable
Port 2/1 is forced down by link-error-disable.
Use the show link-error-disable all command to display the ports with the port flap dampening
feature enabled.
For FastIron Stackabledevices, the output of the command shows the following.
device# show link-error-disable all
Port8/1 is configured for link-error-disable
threshold:1, sampling_period:10, waiting_period:0
Port8/2 is configured for link-error-disable
threshold:1, sampling_period:10, waiting_period:0
Port8/3 is configured for link-error-disable
threshold:1, sampling_period:10, waiting_period:0
Port8/4 is configured for link-error-disable
threshold:1, sampling_period:10, waiting_period:0
Configuring port flap dampening on an interface
78 FastIron Ethernet Switch Administration Guide
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