10GE TOR port buffers (was Re: 10G switch recommendaton)

Leo Bicknell bicknell at ufp.org
Sat Jan 28 01:19:09 UTC 2012

In a message written on Fri, Jan 27, 2012 at 04:00:36PM -0800, Joel jaeggli wrote:
> And people who care have been using something other than a c6500 for
> years. it's a 15 year old architecture, and it's had a pretty good run,
> but it's 2012.

One of the frustrating things, which the c6500 embodies best, is
that the chassis has had many generations of linecards.

It came out in 1999, running CatOS, with a 32Gbps shared bus.

It exists now as a IOS box with a 720Gbps bus, running distributed

While you can call both a 6500, they share little more than some
sheet metal, fans, and copper traces on the backplane.  Wisdom
learned running CatOS on 1st generation cards flat out does not
apply to current generation cards.  And woe be the admin who mixes
and matches generations of cards, there are a million different
configurations and pitfalls.

Cisco is not the only vendor, and the 6500 is not the only product with
this problem.  It makes conversation extremely difficult though, you
can't say a "6500 has xyz property" without detailing a lot more about
the config of the box.

       Leo Bicknell - bicknell at ufp.org - CCIE 3440
        PGP keys at http://www.ufp.org/~bicknell/
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