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BGP4 Route Dampening Policy

Frontier may apply dampening to peer's network announcements in the event of heavy update/withdrawl activity. This policy is standard across all edge routers. In the event of dampening, Peers may contact Frontier to have their dampened routes cleared by issuing a trouble-ticket with the NCAM. Frontier uses a graded dampening policy for its peers which closely resembles the dampening policy outlined in RIPE-229.

Values used in Frontier's Juniper Edge Routers for route dampening:

Prefix length up to and including /21:
  • Penalty for route flap: 1000**
  • Penalty for path attribute change: 500
  • Suppress value: 6000
  • Max Suppress Duration: 30
  • Half-Life Decay: 10
  • Reuse value: 3000
Prefix length /22 and /23:
  • Penalty for route flap: 1000**
  • Penalty for path attribute change: 500
  • Suppress value: 6000
  • Max Suppress Duration: 45
  • Half-Life Decay: 15
  • Reuse value: 1500
Prefix length /24 (Announcements longer than /24 are filtered):
  • Penalty for route flap: 1000**
  • Penalty for path attribute change: 500
  • Suppress value: 6000
  • Max Suppress Duration: 60
  • Half-Life Decay: 30
  • Reuse value: 1640
** Juniper defines a route flap as a transition from one state to another (either up or down), where the penalty is counted on the up and down transition.
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