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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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To set dampening parameters via a route map, use <strong>the</strong> following command in CONFIGURATION<br />

ROUTE-MAP mode:<br />

Command Syntax Command Mode Purpose<br />

set dampening half-life reuse<br />

suppress max-suppress-time<br />

CONFIG-ROUTE-MAP Enter <strong>the</strong> following optional parameters to<br />

configure route dampening parameters:<br />

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

after which <strong>the</strong> Penalty is decreased. After<br />

<strong>the</strong> router assigns a Penalty of 1024 to a<br />

route, <strong>the</strong> Penalty is decreased by half<br />

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

15 minutes)<br />

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

compared to <strong>the</strong> flapping route’s Penalty<br />

value. If <strong>the</strong> Penalty value is less than <strong>the</strong><br />

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

again advertised (or no longer<br />

suppressed). (Default: 750)<br />

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

is compared to <strong>the</strong> flapping route’s Penalty<br />

value. If <strong>the</strong> Penalty value is greater than<br />

<strong>the</strong> suppress value, <strong>the</strong> flapping route is no<br />

longer advertised (that is, it is<br />

suppressed). (Default: 2000.)<br />

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

maximum number of minutes a route can<br />

be suppressed. The default is four times<br />

<strong>the</strong> half-life value. (Default: 60 minutes.)<br />

To view a count of dampened routes, history routes and penalized routes when route dampening is enabled,<br />

look at <strong>the</strong> seventh line of <strong>the</strong> show ip bgp summary command output (Figure 361).<br />

Figure 361 Command example: show ip bgp summary<br />

<strong>Force10</strong>>show ip bgp summary<br />

BGP router identifier 10.114.8.131, local AS number 65515<br />

BGP table version is 855562, main routing table version 780266<br />

122836 network entrie(s) and 221664 paths using 29697640 bytes of memory<br />

34298 BGP path attribute entrie(s) using 1920688 bytes of memory<br />

29577 BGP AS-PATH entrie(s) using 1384403 bytes of memory<br />

184 BGP community entrie(s) using 7616 bytes of memory<br />

Dampening enabled. 0 history paths, 0 dampened paths, 0 penalized paths<br />

Neighbor AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd<br />

10.114.8.34 18508 82883 79977 780266 0 2 00:38:51 118904<br />

10.114.8.33 18508 117265 25069 780266 0 20 00:38:50 102759<br />

<strong>Force10</strong>><br />

Dampening<br />

In<strong>for</strong>mation<br />

To view which routes are dampened (non-active), use <strong>the</strong> show ip bgp dampened-routes command in<br />

EXEC Privilege mode.<br />

510 Border Gateway Protocol (BGP)

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