Re: TE Requirements Draft - ELSP

[Francois Le Faucheur <flefauch@cisco.com>]

At 10:04 16/11/2001 -0500, Nabil Seddigh wrote:
>I thought I should get this comment in before the -02 version
>of the Requirements draft emerges.

just in time...

>Hopefully the authors will
>consider the following suggestion:
>
>- I think it is useful to put an explicit requirement that the TE
>    solutions need to support both E-LSP and L-LSP. The way the
>    draft reads at the moment, it does not come through clearly.
>    Most of the examples and wording would lead one to believe that
>    the DS-TE solutions should only focus on L-LSP.

That's because the requirements indeed assumes that DSTE will be deployed 
using L-LSPs (or E-LSPs but on which traffic from a single OA is carried). 
soon-to-be-released-02 already has text clarifying this.
When deploying DS-TE, the SPs I spoke to wanted not only to do per-class 
admission control but also per-class routing, which normally requires use 
of L-LSPs (or E-LSPs transporting a single OA).

Is allowing operations of DS-TE over E-LSPs which transport a single OA 
what you're after (in which case it's already there)?

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?

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)?
         -  they expect the routers to do fancy things like 
dynamic/on-the-fly mapping of OAs on various LSPs : compute path for 
differnet OAs separately and then if they happen to be the same at one 
point in time push them onto the same LSP? then what happens if later on, 
one OA gets preempted and not the other one: remap one OA on another LSP 
with some other OAs?

Thanks

Francois


>Best
>Nabil Seddigh
>nseddigh@tropicnetworks.com

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Francois Le Faucheur
Development Engineer, IOS Layer 3 Services
Cisco Systems
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Email:                 flefauch@cisco.com
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