[c-nsp] BGP Next-hope convergance

[Chintan Shah]

  Hi Guys,

   I have 6509 (PE3) switch learning VPNV4 routes from two PE1 & PE2 and
select
   best path PE1 ( based on IGP metric).
   Now, PE-1 uplink to core failes and CR(P) find that PE1 not reachable
based
   on IGP dead time = 9 sec and PEe learn that PE1 no more reachable now (
   another 6 sec) so totatl IGP convegance =15 sec. howerver PE3 take
another
   5-6 sec to select best path is PE2 now for remote VPNV4 routes and total
i
   get 21 sec....Why PE3 doesn't select PE2 afer 15 sec (IGP convergance)
and
   wait another 5-6 ...what is that 5-6 can cause overvall convergance 21
sec
   ??
   Can some one help me to understand ?

   Regards,
   Chintan