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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

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