Re: [Pce] Switching type Constraint in PCEP

["fabien.verhaeghe" <[e-mail]>]

Hi Dan, JL, Adrian,

Reading the generic and inter layer requirement documents it is not clear to 
me if Switching Type
is really specific to inter layer application.
As far as I understand inter-layer requirement refers to path computation 
which result path may comprise multiple layer technologies.
Though I understand Switching type is required in this context, it is also 
required for mono layer path computation in a multi-layer environment
(e.g. to computate a Lambda path using a TE Database that contains also TDM 
TE Links).
So it is more a GMPLS specific requirement to me.

Acually it is not clear to me what is the scope of generic and "application 
specific" requirements.
Generic Requirement RFC4657 section 5.1.16 mention Switching and encoding 
type as "GMPLS specific requirements".
Does it mean "GMPLS specific" is "considered as generic?

Concerning the necessity of "encoding type" in PCEP I have to admit that I'm 
not sure to correctly understand the meaning
of this parameter in the GMPLS architecture :-). What I understand at least 
is that it is both an interface and
an LSP property, so from this it seems to be required in PCEP.
I would be interested to see discussion about encoding type requirement in 
PCEP
cause it may clarify the encoding type meaning to me ;-).

Regards
Fabien

----- Original Message ----- 
From: "Adrian Farrel" <[e-mail]>
To: "LE ROUX Jean-Louis RD-CORE-LAN" <[e-mail]>; 
"Dan Li" <[e-mail]>; "fabien.verhaeghe" 
<[e-mail]>; <[e-mail]>
Sent: Wednesday, March 28, 2007 1:46 PM
Subject: Re: [Pce] Switching type Constraint in PCEP


Just to complete the sequence of referenced I-Ds...

http://www.ietf.org/internet-drafts/draft-ietf-pce-inter-layer-req-04.txt
discusses the requirements for multi-layer path computation (while
http://www.ietf.org/internet-drafts/draft-ietf-pce-inter-layer-frwk-03.txt
gives a framework for the use of PCE in a multi-layer network).

Section 5.1.3 of draft-ietf-pce-inter-layer-req-04.txt describes the
specific requirements that you mention for switching type. And section 5.1.4
discusses adaptation capabilities.

We have not, so far, added a requirement for encoding type and are not clear
whether this is a constraint that is necessary. We'd be interested to have
this discussion.

Before the Prague meeting, Eiji Oki started to put together the necessary
protocol extensions in support of this work, but we held off publication
because the base PCEP needed to advance a bit more. I guess this sounds like
the community is ready for this draft now.

Cheers,
Adrian

----- Original Message ----- 
From: "LE ROUX Jean-Louis RD-CORE-LAN" <[e-mail]>
To: "Dan Li" <[e-mail]>; "fabien.verhaeghe"
<[e-mail]>; <[e-mail]>
Sent: Wednesday, March 28, 2007 11:18 AM
Subject: RE: [Pce] Switching type Constraint in PCEP


Hi Fabien,

The switching type/encoding type used to be carried in earlier versions of
PCEP
( GENERALIZED LABEL OBJECT in
http://www.watersprings.org/pub/id/draft-vasseur-pce-pcep-00.txt).
We decided to remove it from the base spec as this is application specific.
This will be covered in a separate document (for instance switching/encoding
type could be encoded in a optional TLV of the LSPA object).

Best Regards,

JL




________________________________

De : Dan Li [mailto:[e-mail]]
Envoyé : mercredi 28 mars 2007 11:36
À : fabien.verhaeghe; [e-mail]
Objet : Re: [Pce] Switching type Constraint in PCEP


Hi Fabien,

There is a draft "draft-otani-ccamp-gmpls-cspf-constraints-05.txt" which may
relate to this issue. But the switching/encoding type may be considered as
an attribute of a TE-link, so I doubt it has something to do with the PCEP.

Regards,

Dan


----- Original Message ----- 
From: fabien.verhaeghe <mailto:[e-mail]>
To: [e-mail]
Sent: Wednesday, March 28, 2007 4:56 PM
Subject: [Pce] Switching type Constraint in PCEP

Hi,

In RFC4657 one of the generic requirement concerns the support of
switching/encoding type constraint
for GMPLS.

Is there any ongoing work about this item?

Thanks
Fabien



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