BGP timers configuration

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Apr 16th, 2012
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In one of my client location cisco 1841 have two ISP connected in same router.

It is MPLS link  configured with BGP is BSNL and other is TATA.

If bsnl link down means i want sometime to take route to TATA.

if it is possible to set time in BGP??

Kindly tell me anyone how to configure??

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Dan-Ciprian Cicioiu Mon, 04/16/2012 - 22:13
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Hi ,

Are your peers iBGP or eBGP ( I suppose eBGP)

Or tune the timers ( globally or per neighbor ) :

  router bgp yy

    bgp timers 3 9

    neigh x.x.x.x timer 3 9

You have also by default enabled "fast external peer deactivation" which will deactivate your neighbor upon the interface will be down.



kumarpmt83 Tue, 04/17/2012 - 00:08
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i want 5 min time interval between to take route from bsnl to tata.

Vasileios Boulo... Mon, 04/16/2012 - 23:58
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Probably Dan refers to fast external fall-over by writing  "fast external peer deactivation".

With the  fast external fallover the EBGP session between directly connected EBGP is disconnected as soon as the connected subnet through which the session is established is lost.

Definetely you can also improve the BGP convergence by reducing the BGP timers.

A hard reset (clear ip bgp) is needed in order to apply the new timers.

You can also reduce the BGP advertisment interval to a value lower than 30 sec (default)

neighbor ip-address advertisement-interval seconds

Finally, you can also reduce the bgp scan time  for a faster convergence

bgp scan-time XX

Hope that helps


kumarpmt83 Wed, 04/18/2012 - 05:37
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   I want if the bsnl link down means other link Tata  takes the route after 5 min.

   how to configure the timers in bgp???


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