Dell Networking S6000 Uživatelský manuál stáhnout pdf (Strana 200)

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• history entry — an entry that stores information on a downed route

• dampened path — a path that is no longer advertised

• penalized path — a path that is assigned a penalty

To configure route flap dampening parameters, set dampening parameters using a route map, clear

information on route dampening and return suppressed routes to active state, view statistics on route

flapping, or change the path selection from the default mode (deterministic) to non-deterministic, use

the following commands.

• Enable route dampening.

CONFIG-ROUTER-BGP mode

/jointfilesconvert/79615/bgp dampening [half-life | reuse | suppress max-suppress-time] [route-map

map-name]

Enter the following optional parameters to configure route dampening parameters:

– half-life: the range is from 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. The default is

15 minutes.

– reuse: the range is from 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 Withdrawn routes are removed from history state. The default is 750.

– suppress: the range is from 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). The default is 2000.)

– max-suppress-time: the range is from 1 to 255. The maximum number of minutes a route can

be suppressed. The default is four times the half-life value. The default is

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.

• Enter the following optional parameters to configure route dampening.

CONFIG-ROUTE-MAP mode

set dampening half-life reuse suppress max-suppress-time

– half-life: the range is from 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. The default is 15 minutes.

– reuse: the range is from 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). The default is 750.

– suppress: the range is from 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). The default is

2000.

– max-suppress-time: the range is from 1 to 255. The maximum number of minutes a route can

be suppressed. The default is four times the half-life value. The default is 60 minutes.

• Clear all information or only information on a specific route.

EXEC Privilege

clear ip /jointfilesconvert/79615/bgp dampening [ip-address mask]

• View all flap statistics or for specific routes meeting the following criteria.

EXEC or EXEC Privilege mode

200

Border Gateway Protocol IPv4 (BGPv4)

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