To enable BGP route dampening or change various BGP route dampening factors, usethebgp dampening global configuration command. To disable the function or restore the default values, use the no form of this command.
bgp dampening [half-lifereusesuppressmax-suppress-time] [route-map map]
no bgp dampening [half-lifereusesuppressmax-suppress-time] [route-map map]
half-life (Optional) Time (in minutes) after which a penalty is decreased. Once the route has been assigned a penalty, the penalty is decreased by half after the half-life period (which is 15 minutes by default). The process of reducing the penalty happens every 5 seconds. The range of the half-life period is 1 to 45 minutes. The default is 15 minutes.
reuse (Optional) If the penalty for a flapping route decreases enough to fall below this value, the route is unsuppressed. The process of unsuppressing routes occurs at 10-second increments. The range of the reuse value is 1 to 20000; the default is 750.
suppress (Optional) A route is suppressed when its penalty exceeds this limit. The range is 1 to 20000; the default is 2000.
max-suppress-time (Optional) Maximum time (in minutes) a route can be suppressed. The range is 1 to 20000; the default is 4 times the half-life. If the half-lifevalue is allowed to default, the maximum suppress time defaults to 60 minutes.
route-map map (Optional) Name of route map that controls where BGP route dampening is enabled.
Disabled by default.
half-lifeis 15 minutes
reuse is 750
suppressis 2000
max-suppress-timeis 4 times half-life
Global configuration
| Release | Modification | 11.0 | This command was introduced. |
|---|
If this command is used with no arguments, it enables BGP route dampening. The arguments half-life, reuse, suppress, and max-suppress-time are position-dependent. Therefore, if any of them are used, they must all be specified.
The following example sets the half-life to 30 minutes, the reuse value to 1500, the suppress value to 10000; and the maximum suppress time to 120 minutes:
bgp dampening 30 1500 10000 120
| Command | Description |
|---|---|
| clear ip bgp dampening | Clears BGP route dampening information and unsuppress the suppressed routes. |
| clear ip bgp flap-statistics | Clears BGP flap statistics. |
| show ip bgp dampened-paths | Display BGP dampened routes. |
| show ip bgp flap-statistics | Specifies a BGP Display BGP flap statistics. |
Printed for apswan@ctr.ap.nic.in on Wed Mar 5 22:32:57 PST 2003
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