[mrtg] Calculating Leased Line Usage - Are they full duplex?

Barry Young byoung at europe.chep.com
Mon Jun 12 17:24:35 MEST 2000

Sorry folks...I should probably have been a little more
specific in my question.  The question related to the leased
line bandwidth utilisation not Frame Relay. Thanks to those
persons providing F/R related answers anyway :)

I am validating whether we need to upgrade a 512Kb leased
line. By using MRTG to monitor the inOctets & OutOctets of
the serial interface I am seeing traffic in both directions
but want to clarify if I should add both of these figures
together to measure how close we are to full capacity.

Hence the question.  Does a leased line operate in full duplex
mode (ie. 512Kb in each direction concurrently)? Or is it just
512Kb in total, regardless of inbound or outbound direction.

Thanks for any advice...

- - - Previous posting - - -
Could someone please answer a basic question that has been
annoying me recently.

We have a 512Kb leased line connecting to a Frame Relay cloud,
so should I expect to be able to support a maximum of 512Kb at any
one time (ie. total usage = sent bytes + received bytes).  Or does it
operate in a full-duplex fashion with 512Kb available in both directions
at the same time.

I suspect it may be the former but would appreciate some confirmation.
In addition, I think I remember someone from this mailing-list mentioning
that T1 lines do operate in full-duplex mode.  Is my memory correct and
does this apply to E1 lines in Europe also?

If my suspicions are correct, I think I might have to adjust my MRTG
graphs to add both the sent & received octets to see the "true"
utilisation of our leased lines. Oh bother.....
- - - End of previous post - - -

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