[c-nsp] BGP convergence in VRF vs. global routing table on 7600 router

Rodney Dunn rodunn at cisco.com
Fri Oct 19 07:54:22 EDT 2007


I need to check this in the lab but if you look at the vpn table are
we not allocating a VPNV4 label for each prefix when it's in the

I know some improvements to BGP were made in SRB2 but I haven't
looked the exact details up to see if it would impact this particular


On Fri, Oct 19, 2007 at 01:35:35PM +0200, Christian Bering wrote:
> Hi all,
> Putting a full Internet routing table inside a VRF instead of in the
> global routing table, we see BGP convergence times about a factor 10
> higher.
> As far as we can tell, it's mostly the BGP process eating CPU time, so
> it doesn't seem to be a matter of label allocation or FIB/TCAM
> programming.
> What makes the BGP process behave differently in a VRF than it does in
> global routing table?
> Is it because the code hasn't been optimised for this? Or a hardware
> issue?
> Any knobs to adjust?
> Any improvements to this behaviour in SRB2 over SXE, SXF or SRA?
> -- 
> Regards
>  Christian Bering
>  IP engineer, nianet a/s
>  Phone: (+45) 7020 8730
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