Re: GiGE performance question(s)

[John Fraizer <nanog () EnterZone Net>]

On Wed, 13 Sep 2000, Scott Michel wrote:

> On Tue, 12 Sep 2000, RJ Atkinson wrote:
> > > Anyone out there have any Cisco GigE operational experience? I've got a
> > > customer who's evaluating GigE to 100 switched Ethernet, and they want
> > > a homogeneous vendor network (I don't know why, I just help them write
> > > the trade study...) So far, there's a huge question about Cisco GigE
> > > to 100 switched performance and I was wondering if anyone's willing to
> > > cough up numbers.
> >
> >         What sort of numbers are you after ?
>
> Well, given the customer, often the numbers their looking for are pretty
> nebulous and often not as well defined as anyone'd like, but getting a
> customer's requirements are usually that way to begin with.
>
> Basically, they want to be all Cisco, contemplating GiGE fiber for their
> backbone, with switched 100 to the desktop. The numbers they're interested
> in are number of sustainable 100 ports to GigE port. With a 45Gbs backbone
> quoted for the Cisco box, that would appear to be pretty limited.


If they're only feeding it with 45Mb/s, the GigE backbone will be MUCH
MORE than sufficient, even if it were to only operate at 1/5 optimal.

The GigE backbone will support about 100Mb/s ports blasting everything
they can.  In the "real world", If you could expand nearly infinately
given the following configuration:

DS3 --> Router --GigE--> GigE-Switch
                          | | | | |
                          | | | | |----GigE-->10/100-Switch
                          | | | |------GigE-->10/100-Switch
                          | | |--------GigE-->10/100-Switch
                          | |----------GigE-->10/100-Switch
                          |---and on and on and on

                    

---
John Fraizer
EnterZone, Inc


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