At 05:23 PM 8/23/01, Howard C. Berkowitz wrote:
> >Most are full duplex, so in those cases, no you shouldn't..
> >
> >Brian "Sonic" Whalen
> >Success = Preparation + Opportunity
> >
> >
> >On Thu, 23 Aug 2001, Wright, Jeremy wrote:
> >
> > > Can you have collisions on a serial link? Thanks again.
> >
>
>
>I'm in general agreement, but be aware that you might run into IBM
>BSC or SDLC networks that use polled multidrop on half-duplex
>facilities. Rare now, but you might see them on things like
>automatic teller machines, point-of-sale terminals, etc. -- those
>being critical business applications that work, so no one wants to
>fiddle with them.
>
But they still wouldn't see collisions, which is an Ethernet concept. I
used to know BISYNC and could explain how the devices take turns, but I
sure can't remember any more! ;-) It wasn't akin to CSMA/CD or CSMA/CA,
however.
The answer to the question is that you should not see collisions on a
serial link. Cisco uses a "template" for the output of show interface
commands that does not remove statistics that are irrelevant to the
interface being shown. So show int s0 does include a collision count but
it's always zero.
As a CCIE (even a CCNA?! ;-) you would be expected to know to ignore that
count unless you happened to see a non-zero value, in which case you would
scratch your head, but not be expected to explain it, since it would be
completely illogical.
Priscilla
________________________
Priscilla Oppenheimer
http://www.priscilla.com
Message Posted at:
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