set dampening half-life reuse suppress max-suppress-time
no set dampening
half-life 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 from 1 to 45 minutes. The default is 15 minutes. reuse Unsuppresses the route if the penalty for a flapping route decreases enough to fall below this value. The process of unsuppressing routes occurs at 10-second increments. The range of the reuse value is from 1 to 20000; the default is 750. suppress Suppresses a route when its penalty exceeds this limit. The range is from 1 to 20000; the default is 2000. max-suppress-time Maximum time (in minutes) a route can be suppressed. The range is from 1 to 20000; the default is four times the half-life value. If the half-life value is allowed to default, the maximum suppress time defaults to 60 minutes.
To set the BGP route dampening factors, use the set dampening route map configuration command. To disable this function, use the no form of this command.
Use the route-map global configuration command, and the match and set route-map configuration commands, to define the conditions for redistributing routes from one routing protocol into another. Each route-map command has a list of match and set commands associated with it. The match commands specify the match criteria--the conditions under which redistribution is allowed for the current route-map command. The set commands specify the set actions--the particular redistribution actions to perform if the criteria enforced by the match commands are met. The no route-map command deletes the route map.
When a BGP peer is reset, the route is withdrawn and the flap statistics cleared. In this instance, the withdrawal does not incur a penalty even though route flap dampening is enabled.
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:Router(config)#route-map tag Router(config-route-map)#match as path 10 Router(config-route-map)# set dampening 30 1500 10000 120 Router(config)#router bgp 100 Router(config-route-map)#neighbor 126.96.36.199 route-map tag in
match ip address
match ip next-hop
match ip route-source
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