[nsp] another counter funny

[Gert Doering]

Hi,

On Wed, Apr 28, 2004 at 08:38:28AM -0700, Christopher J. Wolff wrote:
> I set a full/100 port on a cat 3550 for connection into a Nortel BPS.
> Unbeknownst to me, the Nortel BPS port was set up as auto detect.  The
> Nortel autodetected that the cat 3550 port was half/100.  There were many
> collisions recorded on the cat 3550 port counters.

How can the 3550 detect a collision here?  If the 3550 is set to
"full-duplex", a collision (on the 3550 side) *can* *not* *happen*.  
The very essence of a "collision" (reception of a packet preamble while
preparing to send) cannot happen if the port is *permitted* to send and
receive at the same time (= full-duplex).

The Nortel will report collisions to no end (because every packet sent
full-duplex by the 3550 will be seen as a collision).

gert
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