Thanks guys!
Kent
--- Priscilla Oppenheimer <[EMAIL PROTECTED]> wrote:
> Wire speed means the switch can pump out packets as
> fast as the medium can
> handle. For example, the maximum packets-per-second
> rate on 10-Mbps
> Ethernet with 64-byte packets is 14,880 packets per
> second. This comes from
>
> Preamble = 64 bits
> 64 Byte frame = 512 bits
> Interframe gap = 96 bits
>
> Total = 672 bits
>
> Max packets per second on 10 Mbps Ethernet =
> 10,000,000 / 672 = 14,880
> packets per second. A wire-speed switch, which most
> are, would have no
> problem outputting that number of packets per
> second.
>
> If you were to use 1024 byte packets, the number is
> 1197 packets per second
> on 10Mbps Ethernet.
>
> So, yes, vendors do tend to use 64-byte packets when
> quoting their results,
> because it gives them better numbers.
>
> The other thing vendors do is quote the results when
> using Gigabit
> Ethernet. That's where numbers like millions of
> packets per second come
> from. In addition, if the vendor's numbers are based
> on tests that output
> to multiple ports, then you can get astronomical
> numbers, for example, 1.48
> million packets per second multiplied by 100 ports.
> As you can probably
> guess, this is a rudimentary way of specifying the
> performance of a switch
> that is fraught with the over-zealousness of
> marketing drones. &;-)
>
> Priscilla
>
>
> At 02:12 PM 9/10/00, Kent wrote:
> >Hi all,
> >
> >Any body knows what they mean by saying
> "wire-speed"
> >forwarding about a switch?
> >Also, when Cisco says a switch can forward at 100
> >million pps or something like this, what the size
> of
> >the packets they usually refer to of the PPS(packet
> >per second)? 64byte?
> >
> >Thanks
> >
> >Kent
> >
> >
> >
> >
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> ________________________
>
> Priscilla Oppenheimer
> http://www.priscilla.com
>
__________________________________________________
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