[Nml-wg] PerfSONAR UML schema

[Freek Dijkstra]

Aaron, Martin,

Thanks for creating the UML schema! It's very useful to start a discussion.

I have two questions.

First, what is the differences between Network and Domain? [1] It was 
discussed today, but couldn't really understand the details by phone.

Second, the relation Link-Port in PerfSONAR is different from the 
relation Link-Interface in NDL [2]: in PerfSONAR it is many to one, 
while in NDL it is one to many. So, I understand that a Port in 
PerfSONAR can be connected to multiple links, but a link can only have 
one Port. I don't really understand. Can you give me an example?

In NDL, a Link can have multiple Interfaces (typically 2). An interface 
is a logical interface, that is only connected to one link. If there 
would be multiple links, we would describe that with multiple (logical) 
interfaces (or with a BroadcastSegment).

Regards,
Freek

[1] The difference between NetworkDomain and AdminDomain in NDL is that 
a NetworkDomain is a collection of network resources, while an 
AdminDomain is a collection of people (= an organization!): the people 
or organization that is responsible for managing the resources. The 
resources of an AdminDomain are not limited to network resources, but 
could also include CPU, storage, vizualization, services, etc.

[2] A Link in NDL is a special case of a BroadcastSegment: a broadcast 
segment with exactly two interfaces.

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