User Manual UMN:CLI
V5808
527
11.1.9 Route Flap Dampening
The route dampening minimizes the instability caused by route flapping. A penalty is
added for every flap in a flapping route. As soon as the total penalty reaches the
“suppress” limit the advertisement of the route is suppressed. This penalty is decayed
according to the configured “half time” value. Once the penalty is lower than the “reuse”
limit, the route advertisement is un-suppressed.
To enable the route-flap dampening, use the following command.
Enables the route-flap dampening.
To configure BGP dampening parameters, use the following command.
Configures BGP dampening parameters.
1-45: reachability half-life time in minute (default: 15
minutes)
1-20000: reuse limit value (default: 750)
1-20000: suppress limit value (default: 2000)
1-255: max-suppress-time (default: 60 minutes)
1-45: un-reachability half-life time for penalty
bgp dampening <1-45> <1-
20000> <1-20000> <1-255>
bgp dampening <1-45> <1-
20000> <1-20000> <1-255> <1-
45>
bgp dampening route-map
WORD
Specifies the route-map criteria for dampening.
WORD: route-map name
When the penalty for a suppressed route decays below the “reuse value”, the routes
become unsuppressed. When the penalty for a route exceeds the “suppress value”, the
route is suppressed.
The “reachability half-life time” is for the penalty to decrease to one-half of its current
value. The “max-suppress-time is the maximum time that a dampened route is
suppressed. This value is 4 times the half-life time.
To delete the configured BGP dampening parameters, use the following command.
Deletes the configured BGP dampening parameter.
To display detailed information about dampening, use the following command.
show ip bgp dampening
dampened-paths
Shows paths suppressed due to dampening.
show ip bgp dampening flap-
statistics
Shows flap statistics of routes.
Shows details of configured dampening parameters.
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