Reference Guide

566 | Interfaces
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Parameters
Defaults
Disabled
Command Modes
INTERFACE (conf-if-)
Command
History
Example
Usage
Information
With each flap, FTOS penalizes the interface by assigning a penalty (1024) that decays exponentially
depending on the configured half-life. Once the accumulated penalty exceeds the suppress threshold
value, the interface is moved 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. Once the penalty decays below the reuse threshold, the interface is enabled. The
configured parameters should follow:
• suppress-threshold should be greater than reuse-threshold
• max-suppress-time should be at least 4 times half-life
Related
Commands
half-life
Enter the number of seconds after which the penalty is decreased. The
penalty is decreased by half after the half-life period expires.
Range: 1 to 30 seconds
Default: 5 seconds
reuse-threshold
Enter a number as the reuse threshold, the penalty value below which the
interface state is changed to “up”.
Range: 1 to 20000
Default: 750
suppress-threshold
Enter a number as the suppress threshold, the penalty value above which the
interface state is changed to “error disabled”.
Range: 1 to 20000
Default: 2500
max-suppress-time
Enter the maximum number for which a route can be suppressed. The default
is four times the half-life value.
Range: 1 to 86400
Default: 20 seconds
Version 8.1.1.0 Introduced on E-Series ExaScale
Version 7.6.1.0 Introduced on S-Series
Version 7.5.1.0 Introduced on C-Series
Version 7.4.1.0 Introduced on E-Series
FTOS(conf-if-gi-3/2)#dampening 20 800 4500 120
FTOS(conf-if-gi-3/2)#
Note: Dampening cannot be applied on an interface that is monitoring traffic for other
interfaces.
clear dampening Clear the dampening counters on all the interfaces or just the specified
interface.
show interfaces dampening
Display interface dampening information.