[ppml] Legacy /24s

Leo Bicknell bicknell at ufp.org
Mon Sep 3 15:12:27 EDT 2007

In a message written on Sun, Sep 02, 2007 at 07:33:21PM -0400, William Herrin wrote:
> Well, the 12416 fully loaded is running in the $10k to $80k range on
> the second hand market right now. The T640 is running moderately
> higher. I don't know about the CSR-1.

And the second hand market generally provids them at around $0.10
on the dollar, so there's an idea of what the companies paid for
them brand new.

> If you're telling me that 50% of the DFZ routers are these biggest of
> the big iron and they face the same FIB issues as my poor Sup2 then my
> estimate of a PI route's cost needs some revision. If you're talking
> 10% and and traffic capacity as the main driver then the impact on the
> final numbers won't be enough to waste time on the analysis.

No, that's not what I'm telling you.  I'm telling you that if I'm
a large ISP, and I have a POP with 20 Cisco 7513's still aggregating
DS-3 customers that my upgrade is not going to be 20 new whatevers.
It's going to be 5 new 12416's or T640's, perhaps not with DS-3
cards but with channelized OC-48 cards, which require upgrades to
my telco infrastructure as well.

Now, that's not all for IPv6.  If you were trying to divide up cost,
some is convenience, some is what is supported, some is where you
think your business is going.

Even if you can pull out a Sup720-3B and replace it with a Sup720-3BLX
(which is a relatively cheap upgrade as box upgrades go) that still
may not be a smart move.  If you're running all older linecards and
about to hit the traffic wall that requires all distributed linecards
in less than a year you may look at swapping out the entire chassis

At the end of the day, there's two costs to consider.  The cost
directly attributable to IPv6, and the additional cost of "if we're
going to do these upgrades now, we might as well do these other
things because it makes sense."

However, I think we are running fairly far afield here, point is, adding
routes to the global table is "expensive", which is why the community
likes to avoid it, where possible.

       Leo Bicknell - bicknell at ufp.org - CCIE 3440
        PGP keys at http://www.ufp.org/~bicknell/
Read TMBG List - tmbg-list-request at tmbg.org, www.tmbg.org
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