nanog mailing list archives

Re: estimation of number of DFZ IPv4 routes at peak in the future


From: Owen DeLong <owen () delong com>
Date: Fri, 11 Mar 2011 17:53:57 -0800


On Mar 11, 2011, at 5:43 PM, William Herrin wrote:

On Fri, Mar 11, 2011 at 6:39 PM, Justin Krejci <jkrejci () usinternet com> wrote:
On Wed, 2011-03-09 at 09:32 -0500, John Curran wrote:
On Mar 9, 2011, at 12:43 AM, Majdi S. Abbas wrote:
   I suspect that as we reach exhaustion, more people will be
forced to break space out of their provider's v4 aggregates, and
announce them, and an unfiltered DFZ may well approach the 'million'
entries some vendors now claim to support.

This matches my personal view (and could be viewed as
"success" compared to the 5M estimate of Mr. Herrin...)

Are people going to be relying on using default-routing then in the
future if they don't upgrade routers to handle large routing table
growth? Or perhaps forgo dual-stack and have a separate physical IPv6
BGP network from IPv4? Are there any other strategies?


Hi Justin,

IMHO, the most sensible strategy is to recognize that that cost of a
route has been dropping faster than the route count has been rising
for the past decade. Then recognize that with today's hardware,
building a route processor capable of keeping up with 10M routes
instead of 1M routes would cost maybe twice as much... 10M being
sufficient to handle the worst case estimates for the final size of
the IPv4 table in parallel with any reasonable estimate of the IPv6
table in the foreseeable future. Better CPU, more DRAM, bigger TCAM.
It could be built today.

But the RP is the easy cheap part. It's the line cards and the
TCAM/etc. that they use that gets pricey fast.

Finally, get mad at your respective router manufacturers for
engineering obsolescence into their product line by declining to give
you the option.

The option of $60,000 line cards instead of $30,000 or
even $25,000 instead of $12,000 does not seem like one
that most would have found appealing.

But that's just my opinion...

And the above is just mine.

Owen



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