Global Route Flap Dampening

Use the bgp dampening command if you want to enable route flap dampening with the same values on all BGP routes, or on all routes matching the specified route map. If you specify a route map, the router dampens only routes that are permitted by the route map. For example:

bgp dampening

• Use to enable BGP route flap dampening on all BGP routes or routes matching a specified route map.
• You can specify a complete set of values that determine how routes are dampened. If you choose to do so, you must specify the entire set:
  • half-life— When this period expires, the penalty assigned to a route is decreased by half
  • reuse— When the penalty for a flapping route falls below this limit, the route is unsuppressed (added back to the BGP table and used for forwarding)
  • suppress—When a route’s penalty exceeds this limit, the route is suppressed
  • max-suppress-time—When the period a route has been suppressed exceeds this limit, the route becomes unsuppressed
• If you specify the preceding set of dampening values, you can optionally specify a half-life-unreachable period to apply to unreachable routes. If you do not specify this value, the same half-life period is used for both reachable and unreachable routes.
• Dampening applies only to routes learned by means of EBGP.
• The new dampening parameters are applied in future flaps. Changing the dampening parameters does not affect the Figure of Merit that has been calculated for routes using the old dampening parameters. To reset the Figure-of-Merit for all routes, you must issue the clear ip bgp dampening command.
• Use the no version to disable route flap dampening.
• See bgp dampening.

clear bgp ipv6 dampening

clear ip bgp dampening

• Use to clear the BGP route flap dampening information and unsuppress the suppressed routes.
• You can use the flap-statistics keyword as an alternative to the dampening keyword. Both achieve the same results.
• This command takes effect immediately.
• Examples

  To clear IPv6 dampening information for all routes in all routers:

  host1#clear bgp ipv6 dampening

  To clear IPv6 dampening information for a specific route:

  host1#clear bgp ipv6 dampening 6000::/64

  To clear IPv4 dampening information for all routes in all address families in all VRFs:

  host1#clear ip bgp dampening

  To clear IPv4 dampening information for all routes in VRF dogwood:

  host1#clear ip bgp ipv4 dogwood dampening

  To clear IPv4 dampening information for all non-VRF routes in the IPv4 unicast address family:

  host1#clear ip bgp vrf unicast dampening

  To clear IPv4 dampening information for a specific route:

  host1#clear ip bgp dampening 192.168.5.0 255.255.255.0

  To clear IPv4 dampening information for the most specific route matching an address:

  host1#clear ip bgp dampening 192.168.5.0

• There is no no version.
• See clear bgp ipv6 dampening.
• See clear ip bgp dampening.

Copyright © 2008, Juniper Networks, Inc. All rights reserved. Trademark Notice.