[Nml-wg] Adaptations

[John Vollbrecht]

Martin --

Thanks for the note.

Just to be clear, I assume your response means that answering the  
questions about how to describe DCN, along the lines you suggest, is  
part of the work plan for the NML group.  Is that right or is there  
some group action required to make it part of the group's deliverables?

John


On Jun 26, 2008, at 7:03 AM, Martin Swany wrote:

> Hi John,
>
> This is a great set of questions and get right at the heart
> of the problem.
>
>> From what you say, I assume that a logical link between two ports
>> would be what in DCN I call a path segment.  A path  segment has uses
>> some resource on a physical link.  in this case, each logical link
>> then can have an adaptation.  This is ok - but --
>>
>> where is a physical link described?  how do I know how a physical
>> link can be subdivided into dynamic logical links?  how do I create
>> an ete circuit that is a concatenation of logical links.  How do I
>> name the ete circuit and treat it as an entity that is time variant?
>
> The physical link is described as another link (indicating that
> it is physical) and enumerating its characteristics.  Next, we'd
> need to describe the relationship between this physical link
> and the logical links atop it.  In our model (where "our" is the
> topology schema folks in perfSONAR @ Internet2) we have
> an element called "relation".  As I think I mentioned, this is
> one sense of the "adaptation" concept from the NDL.  At any
> rate, we must represent the case you're highlighting.
>
>> These are what seems to me to be needed for DCN, to both create
>> reservations and circuits, and to monitor the reservations and  
>> circuits.
>
> Absolutely.  Hopefully, this begins to address it.
>
> best,
> martin

John Vollbrecht, Senior Network Engineer
Internet2
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