Re: TE Requirements Draft - ELSP

[Nabil Seddigh <nseddigh@tropicnetworks.com>]

Francois,

> Or are you suggesting operations of DS-TE over E-LSPs which 
> transport multiple OAs? In that case, what are the Service 
> Provider requesting this?

Yes to the former. You already heard from Jim Boyle wrt the latter.
There are other service providers interested in this. I am not sure
if they are willing to indicate their positions on the list. Jim gave
an example application. There are other reasons folks are interested
in using E-LSP with DS-TE. e.g. protection, l2vpns etc.

> Could these SPs clarify whether:
> -  they would use this to do per-class admission control but not
> do per-class routing (would it not be a pity to deploy all this
> sophistication and have voice not being able to take its shortest 
> path simply because there is no more resources for data on a link)?

We should be careful not to pre-suppose a solution in the requirements.
In some networks and service solutions it makes sense to route
each class (or OA) on a different LSP while in others may want
to route on the same LSP. In your statement above, you mentioned 
that it would be a shame if voice cannot take the shortest path
due to lack of resources for data. I would rephrase this to say
that as long as constrained based routing algorithms (which are
vendor specific) can select paths to meet the voice constraint,
this should not be an issue. 

Best,
Nabil Seddigh