From: Andrew Lennon (andrew.lennon@xxxxxxxxxxxxx)
Date: Thu May 17 2001 - 21:36:34 GMT-3
Justin,
I apologise.
I spoke out of term without real thought.
Maybe I was taking the OSI a little too far.
I would like to discuss with you a little more (offline) some of your (and
my) comments.
Andy
-----Original Message-----
From: Justin Menga [mailto:Justin.Menga@computerland.co.nz]
Sent: 18 May 2001 01:27
To: 'Andrew Lennon'; Justin Menga; ccielab@groupstudy.com
Subject: RE: ATM question
Hmmm, my knowledge of the OSI model - NOBODY conforms EXACTLY to the OSI
model - the OSI model is a concept. It is all a matter of
interpretation....there is no hard and fast answer to where any protocol
fits into the OSI model.
I am merely offering my interpretation - ATM DOES have application-layer
'like' protocols - what is OAM for? It is a management application for
managing the ATM network - it COULD be interpreted as a layer 7 protocol
(but really is similar to SNMP which is a Layer 5 protocol, can't remember -
sure to fail CCNA now). ATM has it's own protocols within ATM that range as
high as Layer 7.
As for layer 1 - a recent ATM forum specification defines how to directly
map ATM cells to optical media - no SONET framing involved - sounds pretty
Layer 1 to me - or a least Layer 1.5.
I don't profess to be an expert on ATM - I'm just offering my contribution
to this 'OPEN' forum - as you have offered yours, except yours appears to be
less technical and more derogatory. Rather than calling my dialogue "crap",
you would be better served by providing some technical evidence to support
your views.
As I stated in the email, as far as looking at transporting data, ATM fits
into the Layer 2 format - IP (Layer 3) sees ATM as a layer 2 protocol.
WIthin the ATM cloud though, their are/can be Layer 7 ATM protocols running
in order to maintain and support the ATM cloud.
Regards,
Justin Menga CCIE #6640 CCNP+Voice+ATM CCDP MCSE+I CCSE
Network and Security Consultant
Computerland New Zealand
PO Box 3631, Auckland
DDI: (+64) 9 360 4864 Mobile: (+64) 25 349 599
mailto: justin.menga@computerland.co.nz
web: http://www.computerland.co.nz
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-----Original Message-----
From: Andrew Lennon [mailto:andrew.lennon@nscglobal.com]
Sent: Friday, 18 May 2001 11:36 a.m.
To: Justin Menga; ccielab@groupstudy.com
Subject: RE: ATM question
Justin,
I would like to hear your arguments for ATM being a layer 1 protocol.
Since when did ATM stretch to layer 7?
I would also like to hear why you think you know what the hell you are
talking about.
I have heard some crap in my time but you are really taking the piss here!
I am sorry, but it is about time someone said something!
It is clearly obvious that you have absolutely no idea what you are talking
about as your knowledge of the OSI layer is below the level of CCNA.
Or are you trolling on someone elses email address?
Paul, please look into this.
Regs,
Andy
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
Justin Menga
Sent: 17 May 2001 22:55
To: 'sanjay'; ccielab@groupstudy.com
Subject: RE: ATM question
As a transport protocol, ATM is a layer 1 and 2 protocol - however ATM has
various control and user protocols that could be classified as all the way
up to Layer 7. But in the paradigm of TCP/UDP -> IP -> Layer 2 -> Physical,
ATM fits the Layer 2 and Physical layer (a recent standard allows ATM to
frame directly to optical, rather than use SONET frames).
Regards,
Justin Menga CCIE #6640 CCNP+Voice+ATM CCDP MCSE+I CCSE
WAN Specialist
Computerland New Zealand
PO Box 3631, Auckland
DDI: (+64) 9 360 4864 Mobile: (+64) 25 349 599
mailto: justin.menga@computerland.co.nz
web: http://www.computerland.co.nz
CAUTION: This e-mail message and accompanying data may contain information
that is confidential and subject to privilege. If you are not the intended
recipient, you are notified that any use, dissemination, distribution or
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e-mail in error, please notify me immediately and delete all material
pertaining to this e-mail. Thank you.
-----Original Message-----
From: sanjay [mailto:ccienxtyear@hotmail.com]
Sent: Friday, 18 May 2001 5:25 a.m.
To: ccielab@groupstudy.com
Subject: ATM question
Is ATM a layer 2 technolgy or layer 3 ?
thanks,
Sanjay
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