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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 protocol.one 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??
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.
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
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