perfsonar development work

[Aaron Brown <>]

Looking into monitoring status for dynamic circuits, I've written down a 
strawman for an architecture that makes use of the gLS, and should 
hopefully be easy to integrate with the DICE DCN model. There are some 
similarities to E2EMon (per-domain monitoring), but the architecture 
differs in a number of ways (circuit descriptors and extensive LS use).

In the model, as the circuit is being provisioned, a descriptor of the 
circuit would be built up that would contain a key for each domain the 
circuit passes over. This descriptor would then be registered in a TS 
and the ID for the descriptor would be registered in the gLS so the 
descriptor could be easily be looked up.

Each domain would have a measurement archive that, when given that 
domain's key, would return the status of the circuit for that domain. 
The domain would place a mapping into the gLS, enabling clients to 
locate the measurement archive able to respond to the domain's key. 
Interested clients who know only the circuit identifier could then look 
up the status of the whole circuit by looking up the status of each 
domain-specific segment of the circuit.

Each domain would be able to implement its status monitoring in 
whichever way works most effectively for it. There would be three 
capabilities required of each domain. It would need to be able to add 
its key to the descriptor as the descriptor was being constructed. It 
would need to have a service able to respond to the keys it has added to 
the descriptors with the status of those circuits. Lastly, the domain 
would need to register the keys it has generated into the gLS.

A more detailed description can be found at 
https://wiki.internet2.edu/confluence/display/PSPS/Circuit+Monitoring

Comments and questions are more than welcome.

Cheers,
Aaron