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Tuesday, October 23, 2012

BGP Dampening


Let’s take the following example:
Bgp dampening 10 2500 5000 60

The parameters are as follow:

Half-life: 10 min.
Reuse: 2500 pts.
Suppress-limit: 5000 pts.
Maximum-suppress-time: 60 min.
Maximum Penalty: 30000 pts.

Each route flap will cost 1000 pts., the route will be suppressed (unusable) when the penalty reach behind 5000 pts. (Suppress-limit), every 10 minutes the penalty will reduced by half (Half-life). The maximum time a route can be suppressed is 60 minutes (Maximum-suppress-time) which will occur when the route will reach the maximum points (Maximum penalty).

How to calculate maximum penalty:
Max-penalty = reuse-limit x 2(max-suppress-time / half-life)

 

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