[RINA] Question for all of you

akin at bu.edu akin at bu.edu
Sat Oct 2 10:23:09 EDT 2010

prior to rina, i would usually think that a layer fulfills a defined 
communication requirement/ use case using some mechanisms. then by 
encapsulating a layer inside another layer we can compose functions to 
fulfill our communication goal.

i feel a layer should be a property of a set of systems ? in the 
traditional sense, it may be difficult to abstract the effects of other 
systems in a networked system into a traditional layer ?


Quoting John Day <jeanjour at comcast.net>:

>> Hi John,
>> to me a layer is
>> a logical abstraction identified by a set of functions for which 
>> it's the unique responsible.
> Let me get to the heart of it, is the layer a property of a system or
> of a set of systems?  Can I have a layer in the traditional sense in
> a single system?
>> Can we say that RINA design principle assumes an holistic approach 
>> that is against the modularized "divide and conquer" architecture 
>> ala ISO-OSI, where each so called layer has a limited variables 
>> scope?
> Not quite sure what you mean here.  Are you referring to Dykstra's
> concept that the functions included in a given layer do not need to
> be replicated at higher layers?
> John
>> Flavio
>> 2010/10/1 John Day <<mailto:jeanjour at comcast.net>jeanjour at comcast.net>
>> Lately, I have had inklings from discussions on various IETF lists
>> that what I thought a layer was may be at odds with what much of the
>> Internet thinks a layer is.
>> So I thought I would ask all of you, what it was you were taught a
>> layer was?  Could you define or otherwise characterize the concept
>> of"layer"?  Not layer in RINA, but the concept of layer as you
>> understood it prior to RINA (in case knowledge of RINA has changed
>> your concept of layer).  Of course it would be interesting to know
>> whether or not it has.
>> This is not a trick question.  I suspect that there is a subtle
>> difference and this is the only way I can think to test the
>> hypothesis.
>> Take care,
>> John
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Joseph Akinwumi,
Graduate Student,
Computer Science Department,
Boston University,
MA 02215, USA

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