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
Port8/5 is configured for link-error-disable
threshold:4, sampling_period:10, waiting_period:2
Port8/9 is configured for link-error-disable
threshold:2, sampling_period:20, waiting_period:0
For FastIron X Series devices, the output of the command shows the following.
device# show link-error-disable all
Port -----------------Config--------------- ------Oper----
# Threshold Sampling-Time Shutoff-Time State Counter
----- --------- ------------- ------------ ----- -------
11 3 120 600 Idle N/A
12 3 120 500 Down 424
Displaying ports configured with port flap dampening
defines the port flap dampening statistics
displayed by the
show link-error-disable all
command.
Configuring port flap dampening on a trunk
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FastIron Ethernet Switch Administration Guide
53-1003625-01