actually check this out :
BGP routing table entry for 1.0.0.0/8, version 7
Paths: (1 available, no best path)
Not advertised to any peer
1 (history entry)
12.0.0.1 from 12.0.0.1 (12.0.0.1)
Origin IGP, metric 0, localpref 100, external
Dampinfo: penalty 703, flapped 1 times in 00:07:45
On 17.03.2010 23:50, pra pa wrote:
Little math here .
Basically it is exponential factor determined by using the equation.
:-)
------------------------------------------------------------------------
From: [email protected]
Date: Wed, 17 Mar 2010 17:21:00 -0400
To: [email protected]
CC: [email protected]
Subject: Re: [OSL | CCIE_RS] BGP Route Dampening
The example in the Cisco Press book rather. The half-life actually
will determine the rate of decay. As I said, the time that it takes
for the penalty to decay by half is the half-life time. Therefore,
the half-life determines the decay rate.
On Wed, Mar 17, 2010 at 4:54 PM, Joe Astorino <[email protected]
<mailto:[email protected]>> wrote:
Actually, that is not correct. The half-life is the amount of
time it takes for the penalty to decay by half of the original
value. For instance -- If you have a penalty of 1000 on a prefix
assigned, with a default half-life of 15 minutes, than after 15
minutes the penalty will be at 500.
The specific example that was brought up on cisco.com
<http://cisco.com/> appears to be inaccurate. Don't worry, it's
not the first time : )
On Wed, Mar 17, 2010 at 4:50 PM, Patrice Ngassam
<[email protected] <mailto:[email protected]>> wrote:
15 minutes is the time it will take to decrease the penalty to
zero, in 7.5 minutes the penalty will reach half of its
initial value. half-time has more to do with Penalty than Time.
/*Patrice Ngassam*/
/Ceritified Cisco CCNP, CCDP, CCIP/
------------------------------------------------------------------------
From: [email protected] <mailto:[email protected]>
Date: Wed, 17 Mar 2010 16:35:19 -0400
To: [email protected]
<mailto:[email protected]>
CC: [email protected]
<mailto:[email protected]>
Subject: Re: [OSL | CCIE_RS] BGP Route Dampening
Well, what is the original penalty value given?
On Wed, Mar 17, 2010 at 4:31 PM, Cristian Nedelcu
<[email protected]
<mailto:[email protected]>> wrote:
"The rate of decrease in the penalty is a function of the
half-life. The half-life is the amount of time for the
penalty to decrease to half of its current value. If the
half-life is 15 minutes, the penalty decreases to 500 in
7.5 minutes."
From BGP-4 Command and Configuration Handbook
why 7,5 min and not 15 min ?
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Mailto: [email protected] <mailto:[email protected]>
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Regards,
Joe Astorino - CCIE #24347 (Earned not bought)
Sr. Technical Instructor - IPexpert
Mailto: [email protected] <mailto:[email protected]>
Telephone: +1.810.326.1444
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IPexpert is a premier provider of Self-Study Workbooks, Video on
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certification(s) with training locations throughout the United States,
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