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Re: [RAM] Number of DFZ routers

"Chris L. Morrow" <christopher.morrow@verizonbusiness.com> Tue, 29 May 2007 05:06 UTC

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Date: Tue, 29 May 2007 05:05:03 +0000 (GMT)
From: "Chris L. Morrow" <christopher.morrow@verizonbusiness.com>
Subject: Re: [RAM] Number of DFZ routers
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On Tue, 29 May 2007, Robin Whittle wrote:

> That will never be practical, but I think it is practical to
> make the FIBs of the next generation of routers do "flat
> routing" to /24 granularity with less expense and trouble
> than any current proposal such as LISP.  This only makes
> sense is if BGP can cope with ten or so times the number of
> advertised prefixes as today.  Also, I think LISP would have
> many uses, including for TE and for multihoming to finer
> granularity than /24.
>

keep in mind that /24 is 'globally visible' but there are cases inside an
ISP where /32's may need to be routed in the same way as /16's (same speed
atleast). So, if you mean by /24 "16 million routes in teh FIB flat
routed" then 'ok'... if you mean 'flat routing stops at /24 anything more
specific needs another stage of lookups' then, probably that needs to be
re-thought :(

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