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FTOS Configuration Guide for the C-Series - Force10 Networks

FTOS Configuration Guide for the C-Series - Force10 Networks

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The CLI example below shows configuring values to start reusing or restarting a route, as well as <strong>the</strong>ir<br />

default values.<br />

Figure 360 Setting Reuse and Restart Route Values<br />

<strong>Force10</strong>(conf-router_bgp)#bgp dampening ?<br />

Half-life time <strong>for</strong> <strong>the</strong> penalty (default = 15)<br />

route-map Route-map to specify criteria <strong>for</strong> dampening<br />

<br />

<strong>Force10</strong>(conf-router_bgp)#bgp dampening 2 ?<br />

Value to start reusing a route (default = 750)<br />

<strong>Force10</strong>(conf-router_bgp)#bgp dampening 2 2000 ?<br />

Value to start suppressing a route (default = 2000)<br />

<strong>Force10</strong>(conf-router_bgp)#bgp dampening 2 2000 3000 ?<br />

Maximum duration to suppress a stable route (default = 60)<br />

<strong>Force10</strong>(conf-router_bgp)#bgp dampening 2 2000 3000 10 ?<br />

route-map Route-map to specify criteria <strong>for</strong> dampening<br />

<br />

Use <strong>the</strong> following command in <strong>the</strong> CONFIGURATION ROUTER BGP mode to configure route flap<br />

dampening parameters.<br />

Command Syntax Command Mode Purpose<br />

bgp dampening [half-life<br />

| reuse | suppress<br />

max-suppress-time]<br />

[route-map map-name]<br />

CONFIG-ROUTER-<br />

BGP<br />

Set time be<strong>for</strong>e<br />

value decrements<br />

Set readvertise value<br />

Set suppress value<br />

Set time to suppress<br />

a route<br />

Enable route dampening.<br />

Enter <strong>the</strong> following optional parameters to configure route<br />

dampening parameters:<br />

• half-life range: 1 to 45. Number of minutes after which<br />

<strong>the</strong> Penalty is decreased. After <strong>the</strong> router assigns a<br />

Penalty of 1024 to a route, <strong>the</strong> Penalty is decreased by<br />

half after <strong>the</strong> half-life period expires. (Default: 15<br />

minutes)<br />

• reuse range: 1 to 20000. This number is compared to<br />

<strong>the</strong> flapping route’s Penalty value. If <strong>the</strong> Penalty value<br />

is less than <strong>the</strong> reuse value, <strong>the</strong> flapping route is once<br />

again advertised (or no longer suppressed). Withdrawn<br />

routes are removed from history state. (Default: 750)<br />

• suppress range: 1 to 20000. This number is compared<br />

to <strong>the</strong> flapping route’s Penalty value. If <strong>the</strong> Penalty<br />

value is greater than <strong>the</strong> suppress value, <strong>the</strong> flapping<br />

route is no longer advertised (that is, it is suppressed).<br />

(Default: 2000.)<br />

• max-suppress-time range: 1 to 255. The maximum<br />

number of minutes a route can be suppressed. The<br />

default is four times <strong>the</strong> half-life value. (Default: 60<br />

minutes.)<br />

• route-map map-name: name of a configured route<br />

map. Only match commands in <strong>the</strong> configured route<br />

map are supported. Use this parameter to apply route<br />

dampening to selective routes.<br />

To view <strong>the</strong> BGP configuration, use show config in <strong>the</strong> CONFIGURATION ROUTER BGP mode or<br />

show running-config bgp in EXEC Privilege mode.<br />

<strong>FTOS</strong> <strong>Configuration</strong> <strong>Guide</strong>, version 7.7.1.0 509

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