Re: New version of draft-caviglia-ccamp-pc-and-sc-reqs available on repository

[Dan Li <danli@huawei.com>]

Hi Dimitri,

I think Adrian's answer is correct, I agree with him.

Yes, when we talk about the LSP, it has different menas based on different circumstance such as data plane, control plane and management plane. The draft needs to be clear on this issue.

For the terms LSP in CP/MP, we mean the control state is migrated between CP and MP without any impact on its data plane state.

Regards,

Dan


----- Original Message ----- 
From: "Adrian Farrel" <adrian@olddog.co.uk>
To: "Diego Caviglia" <Diego.Caviglia@marconi.com>; <Dimitri.Papadimitriou@alcatel.be>
Cc: <ccamp@ops.ietf.org>; "Dino Bramanti" <Dino.Bramanti@marconi.com>
Sent: Tuesday, June 20, 2006 8:34 AM
Subject: Re: New version of draft-caviglia-ccamp-pc-and-sc-reqs available on repository


> Hi Dimitri,
> 
> 
> > the doc enters in a discussion in section 1.1 which is the kernel of many
> > discussions we have had on this list
> >
> > from this perspective i'd like to know what you are referring to when
> > stating
> >
> > "A Label Switched Path (LSP) has different semantics depending on the
> > plane in which it the term is used"
> >                                           ^^^^^^^^^
> 
> A bit tricky to determine what is underlined here.
> 
> Anyway, you have highlighted and important issue.
> 
> Sometimes, when people say "LSP" they mean the data plane state. That is the 
> sequence of data plane resources (links, labels, cross-connects) that 
> achieve end-to-end data transport.
> 
> Sometimes people mean the control plane state created to manage the LSP in 
> the data plane.
> 
> Sometime people mean the management plane/configuration information for the 
> LSP in the data plane.
> 
> So the I-D needs to be clear what it is talking about.
> 
> > ps: looking at the terms used for LSP in the MP/CP, the corr. paragraphs
> > just speak about representation of the data path
> 
> Not sure. The authors will probably comment.
> 
> Seems to me that the I-D is talking about maintaining the data plane state 
> while exchanging the control state between the control and management 
> planes. This could probably be clearer in the draft.
> 
> Adrian
> 
> 
> 
> 
>