Reference Guide

174 | Border Gateway Protocol
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Use the following command in the CONFIGURATION ROUTER BGP mode to configure route flap
dampening parameters.
To view the BGP configuration, use
show config in the CONFIGURATION ROUTER BGP mode or
show running-config bgp in EXEC Privilege mode.
To set dampening parameters via a route map, use the following command in CONFIGURATION
ROUTE-MAP mode:
Command Syntax Command Mode Purpose
bgp dampening
[half-life | reuse |
suppress
max-suppress-time]
[route-map
map-name]
CONFIG-ROUTER-BGP Enable route dampening.
Enter the following optional parameters to configure route
dampening parameters:
• half-life range: 1 to 45. Number of minutes after which the
Penalty is decreased. After the router assigns a Penalty of 1024
to a route, the Penalty is decreased by half after the half-life
period expires.
(Default: 15 minutes)
• reuse range: 1 to 20000. This number is compared to the
flapping route’s Penalty value. If the Penalty value is less than
the reuse value, the flapping route is once again advertised (or no
longer suppressed). Withdrawn routes are removed from history
state. (Default: 750)
• suppress range: 1 to 20000. This number is compared to the
flapping route’s Penalty value. If the Penalty value is greater than
the suppress value, the flapping route is no longer advertised
(that is, it is suppressed). (Default: 2000.)
• max-suppress-time range: 1 to 255. The maximum number of
minutes a route can be suppressed. The default is four times the
half-life value. (Default: 60 minutes.)
• route-map map-name: name of a configured route map. Only
match commands in the configured route map are supported. Use
this parameter to apply route dampening to selective routes.