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260 | Border Gateway Protocol IPv4 (BGPv4)
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Figure 10-31. Setting Reuse and Restart Route Values
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.
Command Syntax Command Mode Purpose
bgp dampening [half-life |
reuse | suppress
max-suppress-time]
[route-map map-name]
CONFIG-ROUTER-B
GP
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 Withdrawn routes are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.
FTOS(conf-router_bgp)#bgp dampening ?
<1-45> Half-life time for the penalty (default = 15)
route-map Route-map to specify criteria for dampening
<cr>
FTOS(conf-router_bgp)#bgp dampening 2 ?
<1-20000> Value to start reusing a route (default = 750)
FTOS(conf-router_bgp)#bgp dampening 2 2000 ?
<1-20000> Value to start suppressing a route (default = 2000)
FTOS(conf-router_bgp)#bgp dampening 2 2000 3000 ?
<1-255> Maximum duration to suppress a stable route (default = 60)
FTOS(conf-router_bgp)#bgp dampening 2 2000 3000 10 ?
route-map Route-map to specify criteria for dampening
<cr>
Set time before
value decrements
Set readvertise value
Set suppress value
Set time to suppress
a route