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bgp dampening
Enable BGP route dampening and configure the dampening parameters.
C-Series, E-Series
Syntax
bgp dampening [half-life reuse suppress max-suppress-time] [route-map map-
name]
To disable route dampening, use the no bgp dampening [half-life reuse suppress max-
suppress-time] [route-map map-name] command.
Parameters
half-life (OPTIONAL) Enter the 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 range is 1 to 45. The default is 15
minutes.
reuse (OPTIONAL) Enter a number as the reuse value, which 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 range is 1 to 20000.
The default is 750.
suppress (OPTIONAL) Enter a number as the suppress value, which 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
range is 1 to 20000. The default is 2000.
max-suppress-
time
(OPTIONAL) Enter the maximum number of minutes a route can be suppressed.
The default is four times the half-life value. The range is 1 to 255. The default is 60
minutes.
route-map map-
name
(OPTIONAL) Enter the keywords route-map followed by the name of a
configured route map. Only match commands in the configured route map are
supported.
Defaults Disabled.
Command Modes ROUTER BGPV6-ADDRESS FAMILY
Command
History
Version 8.2.1.0 Introduced on the E-Series ExaScale.
Version 7.4.1.0 Introduced
Usage
Information
If you enter bgp dampening, the default values for half-life, reuse, suppress, and max-
suppress-time are applied. The parameters are position-dependent; therefore, if you configure one
parameter, you must configure the parameters in the order they appear in the command.
Related
Commands
show ip bgp dampened-paths – views the BGP paths.
bgp default local-preference
Change the default local preference value for routes exchanged between internal BGP peers.
C-Series, E-Series
Syntax
bgp default local-preference value
To return to the default value, use the no bgp default local-preference command.
Parameters
value Enter a number to assign to routes as the degree of preference for those routes.
When routes are compared, the higher the degree of preference or local preference
428 Border Gateway Protocol