Re: [RRG] BGP path hunting, MRAI timer and Path Length Damping

[Tony Li <tli@cisco.com>]

On Jun 22, 2007, at 6:46 AM, Noel Chiappa wrote:

> > rough consensus (as of Prague) was quite the contrary: convergence  
> > and
> > messaging _can_ be handled without architectural changes.
>
> Was that really the conclusion, as of Prague? I thought the only  
> thing that
> people agreed on was that the growth rate of the forwarding/routing  
> tables,
> in the static case (i.e. pure size, ignoring dynamic issues) was  
> *technically
> feasible* (which is not the same thing as 'economically feasible',  
> n.b.).


Yes, the consensus was that the dynamics do NOT require architectural  
changes.  This was based on the discussion during the routing area  
meeting.


> I thought there was still significant concern about the dynamics...  
> I mean,
> it is a truism that as the network gets larger, the inter-event  
> time for
> topology changes goes down, and the stabilization time goes up, and  
> the two
> do have to cross somewhere...


Yes, there's "significant concern", primarily coming from the  
operations community.  While decreasing the total data space by  
decreasing DFZ prefixes seems like a beneficial side effect of  
architectural change, it seemed sensible to also pursue some of the  
optimizations to the existing architecture.  Since those changes  
would seem to have significant benefits, this seems like it was a  
reasonable approach.

Regards,
Tony

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