Reference Guide

suppress-
threshold
Enter a number as the suppress threshold, the penalty value above
which the interface state is changed to “error disabled”. The range is
from 1 to 20000. The default is 2500.
max-suppress-
time
Enter the maximum number for which a route can be suppressed. The
default is four times the half-life value. The range is from 1 to 86400.
The default is 20 seconds.
Defaults Disabled.
Command Modes INTERFACE (conf-if-)
Command History
This guide is platform-specific. For command information about other platforms, refer to the
relevant FTOS Command Line Reference Guide .
The following is a list of the FTOS version history for this command.
Version 8.3.19.0 Introduced on the S4820T.
Version 8.3.12.0 Introduced on the S4810.
Version 8.3.11.1 Introduced on the Z9000.
Version 8.1.1.0 Introduced on the E-Series ExaScale.
Version 7.6.1.0 Introduced on the S-Series.
Version 7.5.1.0 Introduced on the C-Series.
Version 7.4.1.0 Introduced on the E-Series.
Usage
Information
With each flap, FTOS penalizes the interface by assigning a penalty (1024) that decays
exponentially depending on the configured half-life. After the accumulated penalty exceeds the
suppress threshold value, the interface moves to the Error-Disabled state. This interface state
is deemed as “down” by all static/dynamic Layer 2 and Layer 3 protocols. The penalty is
exponentially decayed based on the half-life timer. After the penalty decays below the reuse
threshold, the interface enables. The configured parameters are as follows:
• suppress-threshold should be greater than reuse-threshold
• max-suppress-time should be at least 4 times half-life
NOTE: You cannot apply dampening on an interface that is monitoring traffic for other
interfaces.
Example
FTOS(conf-if-gi-3/2)#dampening 20 800 4500 120
FTOS(conf-if-gi-3/2)#
Related
Commands
clear dampening — clears the dampening counters on all the interfaces or just the specified
interface.
show interfaces dampening — displays interface dampening information.
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