"We'll never need more than 640k of memory". What they said in the "old
days".
Kenny
----- Original Message -----
From: "John Neiberger" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Monday, July 03, 2000 9:17 AM
Subject: Re: Switch backplace capacity - how much do you need?
> I've wondered about this myself. Consider the Catalyst 4006 as an
example.
> It has a 60 Gbps backplane. Yes, you read that correctly...SIXTY gigabits
> per second...in a chassis that can hold five modules plus a supervisor
> module. Do we really *need* that much?
>
> My guess is no, we do not need quite that much. however, nowadays I would
> pick the switch with the higher backplane if I had the bucks to get it.
> It's nice to know that what's under the hood can handle anything we throw
at
> it.
>
> Another example: we are going to be purchasing a 6509 with 256 Gbps
> backplane. Why? Because we can. No other reason. Never in a million
> years will we need that much capacity on this particular switch,
especially
> since we'll initially only have five modules in it. But we'll have plenty
> of room for growth and it's one less thing to worry about.
>
> Besides, I'm a speed demon and as long as it's someone else's money (my
> employer's) then I want the biggest, fastest, coolest stuff around. <g>
> Now, if it were MY money, that's another story. I'd be a little more
> realistic about my needs. No one is going to be running every port, full
> duplex, at max capacity. It will never happen, and if it does then you
have
> much greater problems on your hands than just the backplane capacity of
your
> switch.
>
> John Neiberger
>
> > Got another discussion question before I start work this morning ( no 4
> day
> > holiday for me :-< ) sort of a continuation of the Brad Ellis
> discussion
> > about the SE over-engineering solutions for customers.
> >
> > Cisco of late is starting to talk about backplane capacity, and in
> > particular expandable backplane capacity in some of their switches.
> >
> > So the question I have revolves around backplane capacity and
> > "oversubscription" of the backplane on a switch.
> >
> > For example, if I have a Cat 3524 in the closet, and pop in cards to
> permit
> > me 24 ports of 100 mbs full duplex, under what circumstances might I be
> > concerned about "oversubscription". If I indeed had 24 devices plugged
> in,
> > theoretically I could be pumping 4.8 gigs of data simultaneously ( less
a
> > little for interframe gaps, and other overhead kinds of things ) that
> puts
> > me a theoretical 5 times oversubscription of this guy's backplane
> capacity.
> > On the other hand, seems to me that if I were popping that much data
> > simultaneously from my 24 devices I would have other problems. Even
that
> > proverbial high speed database / transaction / e-commerce server is not
> > going to be running full tilt in and out all the time. Let alone user
> > stations, no matter how much radio they listen to, or how many avi's or
> CBT
> > videos they are watching. Those stream one way, recall.
> >
> > So... what kinds of things do you consider when provisioning or
> > recommending? How would you approach this as a design issue?
> >
> > ( and no I do NOT have a customer for whom I am asking ;-> )
> >
> > Chuck
> >
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a
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> >
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> > An excellent study focal point for all levels of certification, as well
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> > You get good study material and I get extra time
> >
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