[Nml-wg] PerfSONAR schema

[Freek Dijkstra]

Aaron and Martin,

Thanks a lot for the UML schema. I just printed it, and will keep it 
under my pillow :-).

A few questions.
First of all, I don't fully understand teh difference between domain and 
network [1]. It was discussed, but not entirely clear by phone.

Second, the relation Port-Link is different from our relation 
Interface-Link [2]. NDL has a many to one relation, while PerfSONAR has 
a one to many relation (the opposite).

So in NDL, a (logical) interface can only be connected to ONE link (or 
one broadcast segment [2]). A link can have multiple connected 
interfaces (typically 2).

Can you explain the situation for PerfSONAR to me? Can a port be 
connected to multiple links? How?

Regards,
Freek

[1] The difference in NDL between AdminDomain and NetworkDomain is: 
NetworkDomain are simply grouping of *network elements*, while 
AdminDomain is a grouping of *people* (=an organization): the people or 
organization responsible for managing resources. The resources of an 
AdminDomain could include CPU, vizualisation, etc. Not just network 
elements. NetworkDomains can only include network resources.

[2] Link in NDL is a special case of a Broadcast network: a broadcast 
network with two end points. I'll use the term Link for now.

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