[mrtg] Re: Leased Line Bandwidth Capacity

[Michael Votaw]

The communications lines you reference do indeed work at full duplex.  So,
if you have a T1, you get 1.536 Mb/sec in both directions simultaneously
(about 3Mb/sec total).  The same goes for E1 and other point to point
circuits through the PSTN.

An exception to this is ASDL and maybe other technologies I don't know
about.  The "A" stands for asymmetrical and is usually setup with a higher
data rate for incoming customer connections and a smaller transmission rate
for outgoing data.

Frame relay reports may need to account for the bursts allowed over your CIR
just so you get good utilization numbers.

MRTG in its default state is already configured for reporting on synchronous
full-duplex ports (just about every kind of port with in and out octets).
So, unless you just don't like what it's showing you, I wouldn't change what
it's doing if I were you.

Your 'true' utilization is indeed 2 graphs composed of in-octets AND another
graph of out-octets.  By combining the two, you lose insight into the
behavior of your traffic patterns.

My 2 cents worth.

> -----Original Message-----
> From: mrtg-bounce at list.ee.ethz.ch [mailto:mrtg-bounce at list.ee.ethz.ch]On
> Behalf Of Barry Young
> Sent: Monday, June 12, 2000 2:42 PM
> To: 'mrtg at list.ee.ethz.ch'
> Subject: [mrtg] Leased Line Bandwidth Capacity
>
>
>
>
> 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.....
>
> Thanks in advance,
>
> Barry Young
>
>
>
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