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# set dampening

#### Syntax

set dampening halfLife reuse suppress maxSuppressTime [ halfLifeUnreachable ]

no set dampening

#### Release Information

Command introduced before JUNOSe Release 7.1.0.

#### Description

Enables route flap dampening and optionally specifies dampening parameters for routes passing through the route map. The no version removes the set clause from a route map.

#### Options

- halfLife—Half-life period in minutes, in the range 1–45; default value is 10. When a BGP route has been assigned a penalty, the penalty is decreased by half after each half-life period. Each time a route flaps, the router configured for route flap dampening assigns the route a penalty. Penalties are cumulative. BGP stores the penalty for all reachable and unreachable routes that have experienced recent flaps.
- reuse—Reuse limit in the range 1–20000; default value is 750. As the penalty for a flapping route decreases and falls below this reuse limit, the route is unsuppressed. That is, the route is added back to the BGP table and used for forwarding.
- suppress—Suppress limit in the range 1–20000; default value is 2000; a route is suppressed when its penalty exceeds this limit
- maxSuppressTime—Maximum suppression time in minutes, in the range 1–255; default value is 60; maximum amount of time a route can be suppressed
- halfLifeUnreachable—Alternate half-life period in minutes for unreachable routes; a number in the range 1–45; default value is 20. If you do not specify this value, the router uses the same half-life period for both reachable and unreachable routes.

#### Mode

Route Map Configuration

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