Supported Platforms
Related Documentation
- ACX, EX, J, M, MX, PTX, QFX, SRX, T Series
- clear bgp damping
- ACX, EX, J, MX, PTX, QFX, T Series
- show route damping
- Additional Information
- “Configuring BGP Flap Damping Parameters” in the Routing Policy Configuration Guide
show policy damping
Syntax
Syntax (EX Series Switch and QFX Series)
Release Information
Command introduced before Junos OS Release 7.4.
Command introduced in Junos OS Release 9.0 for EX Series switches.
Command introduced in Junos OS Release 11.3 for the QFX Series.
Description
Display information about BGP route flap damping parameters.
Options
none | — | Display information about BGP route flap damping parameters. |
logical-system (all | logical-system-name) | — | (Optional) Perform this operation on all logical systems or on a particular logical system. |
Additional Information
In the output from this command, figure-of-merit values correlate with the probability of future instability of a routing device. Routes with higher figure-of-merit values are suppressed for longer periods of time. The figure-of-merit value decays exponentially over time. A figure-of-merit value of zero is assigned to each new route. The value is increased each time the route is withdrawn or readvertised, or when one of its path attributes changes.
Required Privilege Level
view
Related Documentation
- ACX, EX, J, M, MX, PTX, QFX, SRX, T Series
- clear bgp damping
- ACX, EX, J, MX, PTX, QFX, T Series
- show route damping
- Additional Information
- “Configuring BGP Flap Damping Parameters” in the Routing Policy Configuration Guide
List of Sample Output
show policy dampingOutput Fields
Table 1 describes the output fields for the show policy damping command. Output fields are listed in the approximate order in which they appear.
Table 1: show policy damping Output Fields
Field Name | Field Description |
|---|---|
Halflife | Decay half-life, in minutes. The value represents the period during which the accumulated figure-of-merit value is reduced by half if the route remains stable. If a route has flapped, but then becomes stable, the figure-of-merit value for the route decays exponentially. For example, for a route with a figure-of-merit value of 1500, if no incidents occur, its figure-of-merit value is reduced to 750 after 15 minutes and to 375 after another 15 minutes. |
Reuse merit | Figure-of-merit value below which a suppressed route can be used again. A suppressed route becomes reusable when its figure-of-merit value decays to a value below a reuse threshold, and the route once again is considered usable and can be installed in the forwarding table and exported from the routing table. |
Suppress/cutoff merit | Figure-of-merit value above which a route is suppressed for use or inclusion in advertisements. When a route's figure-of-merit value reaches a particular level, called the cutoff or suppression threshold, the route is suppressed. When a route is suppressed, the routing table no longer installs the route into the forwarding table and no longer exports this route to any of the routing protocols. |
Maximum suppress time | Maximum hold-down time, in minutes. The value represents the maximum time that a route can be suppressed no matter how unstable it has been before this period of stability. |
Computed values |
|
Sample Output
show policy damping
user@host> show policy damping Default damping information:
Halflife: 15 minutes
Reuse merit: 750 Suppress/cutoff merit: 3000
Maximum suppress time: 60 minutes
Computed values:
Merit ceiling: 12110
Maximum decay: 6193
Damping information for "standard-damping":
Halflife: 10 minutes
Reuse merit: 4000 Suppress/cutoff merit: 8000
Maximum suppress time: 30 minutes
Computed values:
Merit ceiling: 32120
Maximum decay: 12453
Published: 2013-04-03
Supported Platforms
Related Documentation
- ACX, EX, J, M, MX, PTX, QFX, SRX, T Series
- clear bgp damping
- ACX, EX, J, MX, PTX, QFX, T Series
- show route damping
- Additional Information
- “Configuring BGP Flap Damping Parameters” in the Routing Policy Configuration Guide
