According to the linux folks, you still don't. in fact many of them delight
in bragging how they run their enterprises on some old 486 pc. Pretty soon,
they say, you can throw out those nasty old cisco routers and use linux
boxes of 486 pc's as routers too. :->
( ok. I know. I just threw some more gasoline on the fire. I just started
another war. :-> )
chuck
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] On Behalf Of
Kenny Sallee
Sent: Monday, July 03, 2000 10:31 AM
To: John Neiberger; [EMAIL PROTECTED]
Subject: Re: Switch backplace capacity - how much do you need?
"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
> >
> > Please check out my new footers for a new age
> > 1) Altruism
> > http://www.thehungersite.com/cgi-bin/WebObjects/HungerSite
> > Please help feed hungry people worldwide. A few seconds a day can make
a
> > difference to many people
> >
> > 2) Shameless Hucksterism
> > http://www.certificationzone.com
> > An excellent study focal point for all levels of certification, as well
> as
> > the attainment of internetworking expertise. Use my name when you
> register.
> > You get good study material and I get extra time
> >
> > ___________________________________
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>
>
>
>
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