From: Marvin Greenlee (marvingreenlee@yahoo.com)
Date: Thu Jul 29 2004 - 15:16:00 GMT-3
The route is at 0 initially, because it has not been
penalized. The penalty is 1000 per flap. The penalty
value for a route decays based on the configured
half-life. Each flap will add 1000 to the current
penalty value for the route.
After the first flap, the penalty will be at 1000.
Between the first and second flap, there will be some
decrease in the penalty on the route, due to decay.
If the penalty has decayed to 890 just before the
second flap, the penalty value will be roughly 1890
after the second flap.
The route will be sent to neighbors as long as the
penalty value is less than the suppress threshold.
After the route has risen above the suppress
threshold, it will not be advertised until it has
dropped below the reuse value. The current penalty
for a route can be seen with the command "show ip bgp
x.x.x.x".
r5#show ip bgp 172.1.130.0
BGP routing table entry for 172.1.130.0/24, version
794
Paths: (2 available, best #1, table
Default-IP-Routing-Table)
Advertised to non peer-group peers:
10.0.0.13
6
10.0.0.6 from 10.0.0.6 (150.7.6.6)
Origin incomplete, metric 0, localpref 100, valid,
external, best
3, (suppressed due to dampening)
10.0.0.13 from 10.0.0.13 (172.1.255.1)
Origin incomplete, metric 0, localpref 100, valid,
external
Community: 2000
Dampinfo: penalty 1883, flapped 2 times in 00:02:10,
reuse in 00:13:40
Marvin Greenlee
Network Learning, Inc.
www.ccbootcamp.com
--- Geert Nijs <geert.nijs@simac.be> wrote:
> Hello group,
>
> First of two small questions for the group:
>
> * When configuring bgp dampening, what is the
> default, starting penalty
> of a route ??
>
> Is this 0 or is this 1000 ???
>
> (what is the penalty after the first flap ? 1000 or
> 2000 ? same
> question)
>
>
> Regards,
> Geert
>
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This archive was generated by hypermail 2.1.4 : Sun Aug 01 2004 - 10:12:06 GMT-3