What do you mean by interfame gap? is it the address?
What about ingress and egress issue? how do they calculate it?
Thanks a lot
Bye
On Sun, 10 Sep 2000 19:41:13 -0700, Priscilla Oppenheimer 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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