That's exactly what it's supposed to happen. Half-life is the amount of time that needs to elapse for the penalty to be cut in half. Given no flaps happen, in 15 minutes, total penalty will be 250. After 15 minutes more, it will be 125... and so on. That's how half-life works.
-- Marko Milivojevic - CCIE #18427 Senior Technical Instructor - IPexpert YES! We include 400 hours of REAL rack time with our Blended Learning Solution! Mailto: [email protected] Telephone: +1.810.326.1444 Fax: +1.810.454.0130 Web: http://www.ipexpert.com/ On Tue, Oct 6, 2009 at 07:51, Cristian Nedelcu <[email protected]> wrote: > and 15min , no more or less > 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 499, flapped 1 times in 00:15:03 > > original penalty was 1000 > > > > 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]> > 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 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]> > 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] > Date: Wed, 17 Mar 2010 16:35:19 -0400 > To: [email protected] > CC: [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]> 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 ? > > _______________________________________________ > For more information regarding industry leading CCIE Lab training, please > visit www.ipexpert.com > > > > > -- > Regards, > > > > Joe Astorino - CCIE #24347 (Earned not bought) > Sr. Technical Instructor - IPexpert > Mailto: [email protected] > Telephone: +1.810.326.1444 > Live Assistance, Please visit: www.ipexpert.com/chat > eFax: +1.810.454.0130 > > IPexpert is a premier provider of Self-Study Workbooks, Video on Demand, > Audio Tools, Online Hardware Rental and Classroom Training for the Cisco > CCIE (R&S, Voice, Security & Service Provider) certification(s) with > training locations throughout the United States, Europe, South Asia and > Australia. Be sure to visit our online communities at > www.ipexpert.com/communities and our public website at www.ipexpert.com > > ________________________________ > Envie de naviguer sur Internet sans laisser de trace? La solution avec > Internet Explorer 8 > > > -- > Regards, > > > > Joe Astorino - CCIE #24347 (Earned not bought) > Sr. Technical Instructor - IPexpert > Mailto: [email protected] > Telephone: +1.810.326.1444 > Live Assistance, Please visit: www.ipexpert.com/chat > eFax: +1.810.454.0130 > > IPexpert is a premier provider of Self-Study Workbooks, Video on Demand, > Audio Tools, Online Hardware Rental and Classroom Training for the Cisco > CCIE (R&S, Voice, Security & Service Provider) certification(s) with > training locations throughout the United States, Europe, South Asia and > Australia. Be sure to visit our online communities at > www.ipexpert.com/communities and our public website at www.ipexpert.com > > > > -- > Regards, > > > > Joe Astorino - CCIE #24347 (Earned not bought) > Sr. Technical Instructor - IPexpert > Mailto: [email protected] > Telephone: +1.810.326.1444 > Live Assistance, Please visit: www.ipexpert.com/chat > eFax: +1.810.454.0130 > > IPexpert is a premier provider of Self-Study Workbooks, Video on Demand, > Audio Tools, Online Hardware Rental and Classroom Training for the Cisco > CCIE (R&S, Voice, Security & Service Provider) certification(s) with > training locations throughout the United States, Europe, South Asia and > Australia. Be sure to visit our online communities at > www.ipexpert.com/communities and our public website at www.ipexpert.com > > ________________________________ > Hotmail: Trusted email with powerful SPAM protection. Sign up now. > > _______________________________________________ > For more information regarding industry leading CCIE Lab training, please > visit www.ipexpert.com > > > _______________________________________________ > For more information regarding industry leading CCIE Lab training, please > visit www.ipexpert.com > > _______________________________________________ For more information regarding industry leading CCIE Lab training, please visit www.ipexpert.com
