Your instructor is confusing FECN/BECN with Discard-Eligible.
""Miller, Nathan (AZ15)"" <[EMAIL PROTECTED]> wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> I have received conflicting answers to this question from a number of
> sources to include a Cisco Certified Instructor in a CIT course, so I am
> posting the question here with hope that someone "out there" can clear
this
> up. I have been told that when a frame enters a router with the BECN or
> FECN bit high is this an indicator that there is congestion on a port on a
> frame switch that the frame has traversed (I don't question this). The
> piece of the instructor's explanation that I have a problem with is that
the
> only frames that get the bit flipped are those that are part of a PVC that
> is running outside its CIR. He stated that the traffic moving through the
> same congested port on other PVCs (those running under CIR) will not be
> tagged even though they are moving through a congested port. I thought
that
> every frame traversing the congested port gets the FECN or BECN bit
flipped
> (depending on direction). I have found support for this in a couple of
> books, but I have seen nothing that says definitively that ALL frames
> through the congested port get tagged.
> Many thanks in advance!
>
> Nathan Miller
>
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