Administrator Guide
dampening
Configure dampening on an interface.
C9000 Series
Syntax
dampening [[[[half-life] [reuse-threshold]] [suppress-threshold]] [max-
suppress-time]]
Parameters
half-life
Enter the number of seconds after which the penalty is decreased. The penalty decreases
half after the half-life period expires. The range is from 1 to 30 seconds. The default is 5
seconds.
reuse-threshold
Enter a number as the reuse threshold, the penalty value below which the interface state
is changed to “up”. The range is from 1 to 20000. The default is 750.
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 Dell
Networking OS Command Line Reference Guide.
The following is a list of the Dell Networking OS version history for this command.
Version Description
9.9(0.0) Introduced on the C9010.
9.2(1.0) Introduced on the Z9500.
8.3.19.0 Introduced on the S4820T.
8.3.12.0 Introduced on the S4810.
8.3.11.1 Introduced on the Z9000.
8.1.1.0 Introduced on the E-Series ExaScale.
7.6.1.0 Introduced on the S-Series.
7.5.1.0 Introduced on the C-Series.
7.4.1.0 Introduced on the E-Series.
Usage Information With each flap, the system 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
Dell(conf-if-te-2/2)# dampening 20 800 4500 120
Dell(conf-if-te-2/2)#
Related
Commands
• clear dampening — clears the dampening counters on all the interfaces or just the specified interface.
• show interfaces dampening — displays interface dampening information.
Interfaces 685