A route is considered to be flapping when its availability changes repeatedly.Route Dampening is a way to suppress flapping routes so that they are “suppressed” instead of being advertised.
Since BGP routing tables are huge, it’s not practical to send those routing updates to all the routers especially when a route flap occurs. This could affect the performance of the network as well as consume more routers resources like CPU. As a best practice most ISPs use route dampening regularly.
In this scenario, BGP route dampening will be configured on Router R1 as below –
To Configure R1 and use BGP dampening as per following parameters –
- Penalty should be reduced by half after 10 minutes
- The dampened route must be reused when it reaches value of 750.
- Route should not be used when it reaches 2000 points.
- The routes experiencing Route flaps should not be suppressed for more than 40 minutes