Example: Configuring BGP Flap Damping

Enable BGP flap damping and configure damping parameters:

[edit]

routing-options {

    autonomous-system 666; 

}

protocols {

    bgp {

        damping; 

        group group1 {

            traceoptions {

                file bgp-log size 1m files 10;

                flag damping;

            }

            import damp;

            type external;

            peer-as 10458;

            neighbor 192.168.2.30;

        }

    }

}

policy-options {

    policy-statement damp {

        from {

            route-filter 192.168.0.0/32 exact {

                damping high; 

                accept; 

            } 

            route-filter 172.16.0.0/32 exact {

                damping medium; 

                accept; 

            } 

            route-filter 10.0.0.0/8 exact {

                damping none; 

                accept; 

            }

        }

    }

    damping high {

        half-life 30;

        suppress 3000;

        reuse 750;

        max-suppress 60;

    }    

    damping medium {

        half-life 15;

        suppress 3000;

        reuse 750;

        max-suppress 45;

    }

    damping none {

        disable; 

    }

}

To display damping parameters for this configuration, use the show policy damping command:

user@host> show policy damping

Damping information for "high":

  Halflife: 30 minutes

  Reuse merit: 750 Suppress/cutoff merit: 3000

  Maximum suppress time: 60 minutes

  Computed values:

    Merit ceiling: 3008

    Maximum decay: 24933

Damping information for "medium":

  Halflife: 15 minutes

  Reuse merit: 750 Suppress/cutoff merit: 3000

  Maximum suppress time: 45 minutes

  Computed values:

    Merit ceiling: 6024

    Maximum decay: 12449 

Damping information for "none":

    Damping disabled