[Nml-wg] Spanning tree (was: Transitivity of hasPort)

[Freek Dijkstra]

John Vollbrecht wrote:

>>> Things could get ugly if you try and model spanning tree forwarding
>>> rules! ... but fortunately I think (hope) this is not necessary.

> Why is modeling spanning tree hard?  I would think that it would be  
> possible to model the presence of spanning tree without knowing  the  
> topology of network.

Not hard, ugly. I think it is too detailed to convey to neighbouring 
networks (I'm assuming the context of NML and NSI here which is 
interdomain messaging and modelling).

The model is reasonable: you have to add the concept of a routing table. 
(That would model the MAC layer, not the _presence of_ a spanning tree; 
I'm not sure how to model that except with some boolean attribute).

If you think it is useful, please propose a use case and/or extension to 
the current schema.

Regards,
Freek