Service Manual

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
Networking OS Command Line Reference Guide.
Version Description
9.10(0.0) Introduced on the S6100–ON.
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 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
Dell(conf-if-te-1/10)# dampening 20 800 4500 120
Dell(conf-if-te-1/10)#
Related
Commands
● clear dampening — clear the dampening counters on all the interfaces or just the specified interface.
● show interfaces dampening — display interface dampening information.
Interfaces 609