damping (Interfaces)
Syntax
damping {
enable;
half-life seconds;
max-suppress seconds;
reuse number;
suppress number;
}
Hierarchy Level
[edit interfaces interface--name], [edit interfaces interface--range]
Description
Limit the number of advertisements of the up and down transitions (flapping) on an interface. Each time a transition occurs, the interface state is changed, which generates an advertisement to the upper-level routing protocols. Damping helps reduce the number of these advertisements. Every time an interface goes down, a penalty is added to the interface penalty counter. Penalty added on every interface flap is 1000.
If at some point the accumulated penalty exceeds the suppress
level max-suppress, the interface is placed in the suppress
state, and further interface state up and down transitions are not
reported to the upper-level protocols.
Options
enable—Enable damping on a
per-interface basis. If damping is enabled on an interface, it is
suppressed during interface flaps that match the configuration settings.
Default: Disabled
half-life seconds—Decay
half-life. seconds is the interval
after which the accumulated interface penalty counter is reduced by
half if the interface remains stable.
For the half-life, configure a value that is less than the max-suppress value. If you do not, the configuration is rejected.
Range: 1 through 30
Default: 5
max-suppress seconds—Maximum
hold-down time. seconds is the maximum
time that an interface can be suppressed no matter how unstable the
interface has been.
For max-suppress, configure a value that is greater than the half-life. If you do not, the configuration is rejected.
Range: 1 through 20,000
Default: 20
reuse number—Reuse threshold.
When the accumulated interface penalty counter falls below number, the interface is no longer suppressed.
Range: 1 through 20,000
Default: 1000
suppress number—Cutoff
(suppression) threshold. When the accumulated interface penalty counter
exceeds number, the interface is suppressed.
Range: 1 through 20,000
Default: 2000
Required Privilege Level
routing—To view this statement in the configuration.
routing-control—To add this statement to the configuration.
Release Information
Statement introduced in Junos OS Release 14.1.