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Dell Command Line Reference Guide for the S4048–ON System 9.14.2.6

dampening

Configure dampening on an interface.

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, see the relevant Dell EMC Networking OS Command Line Reference Guide.

Version
Description
9.10(0.1)
Introduced on the S6010-ON and S4048T-ON.
9.10(0.0)
Introduced on the S3148.
9.10(0.0)
Introduced on the S6100–ON.
9.8(2.0)
Introduced on the S3100 series.
9.8(1.0)
Introduced on the Z9100–ON.
9.8(0.0P5)
Introduced on the S4048-ON.
9.8(0.0P2)
Introduced on the S3048-ON.
9.7(0.0)
Introduced on the S6000-ON.
9.2(1.0)
Introduced on the Z9500.
9.0.2.0
Introduced on the S6000.
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.
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, Dell EMC Networking OS 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 
DellEMC(conf-if-te-1/10)# dampening 20 800 4500 120
DellEMC(conf-if-te-1/10)#
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