Re: [CCAMP] I-D Action: draft-ietf-ccamp-gmpls-general-constraints-ospf-te-02.txt

Hi, 

I have the following comments/question regarding this revision

3.2. Available Labels:

The text state : “The Available Labels sub-TLV   may occur at most once within the link TLV.”

How to encode different label format in that case? I think the label format would depend 
on the ISCD, and as we might have several ISCD, having several Available Label sub-TLV make sense.
This also apply to 3.3. Shared Backup Labels.

In case of several ISCD are present for a given advertisement how to interpret the label format in the 
label-related sub-TLVs?

Could you clarify this point, it would be useful for instance to consider the example of a link supporting SDH
(no VC4-switching), ODU (G.709, as of RFC4328, and for the current G.709 v3 label format).

The text is very focused on WSON, while it is a very interesting example, having other technology (OTN for
example would help to show that the solution is generic.

Best Regards, 
Cyril

> -----Original Message-----
> From: ccamp-bounces@ietf.org [mailto:ccamp-bounces@ietf.org] On Behalf
> Of ext Zhangfatai
> Sent: Thursday, September 22, 2011 11:17 AM
> To: ccamp@ietf.org
> Subject: Re: [CCAMP] I-D Action: draft-ietf-ccamp-gmpls-general-
> constraints-ospf-te-02.txt
> 
> Hi CCAMPers,
> 
> A new version has been submitted to address the comments from the WG
> discussion.
> 
> We accepted Acee and Young's suggestion to introduce a new top-level
> node TLV (Generic Node Attribute TLV) to simplify things and a new
> section (Section 5) was added to describe scalability issue.
> 
> More information from: http://www.ietf.org/id/draft-ietf-ccamp-gmpls-
> general-constraints-ospf-te-02.txt
> 
> Please check out for details and comments are always welcome.
> 
> 
> Thanks
> 
> Fatai
> 
> 
> -----Original Message-----
> From: ccamp-bounces@ietf.org [mailto:ccamp-bounces@ietf.org] On Behalf
> Of internet-drafts@ietf.org
> Sent: 2011年9月22日 17:06
> To: i-d-announce@ietf.org
> Cc: ccamp@ietf.org
> Subject: [CCAMP] I-D Action: draft-ietf-ccamp-gmpls-general-
> constraints-ospf-te-02.txt
> 
> A New Internet-Draft is available from the on-line Internet-Drafts
> directories. This draft is a work item of the Common Control and
> Measurement Plane Working Group of the IETF.
> 
> 	Title           : OSPF-TE Extensions for General Network Element
> Constraints
> 	Author(s)       : Fatai Zhang
>                           Young Lee
>                           Jianrui Han
>                           Greg Bernstein
>                           Yunbin Xu
> 	Filename        : draft-ietf-ccamp-gmpls-general-constraints-
> ospf-te-02.txt
> 	Pages           : 14
> 	Date            : 2011-09-22
> 
>    Generalized Multiprotocol Label Switching can be used to control a
>    wide variety of technologies including packet switching (e.g.,
> MPLS),
>    time-division (e.g., SONET/SDH, OTN), wavelength (lambdas), and
>    spatial switching (e.g., incoming port or fiber to outgoing port or
>    fiber). In some of these technologies network elements and links may
>    impose additional routing constraints such as asymmetric switch
>    connectivity, non-local label assignment, and label range
> limitations
>    on links. This document describes OSPF routing protocol extensions
> to
>    support these kinds of constraints under the control of Generalized
>    MPLS (GMPLS).
> 
> 
> 
> A URL for this Internet-Draft is:
> http://www.ietf.org/internet-drafts/draft-ietf-ccamp-gmpls-general-
> constraints-ospf-te-02.txt
> 
> Internet-Drafts are also available by anonymous FTP at:
> ftp://ftp.ietf.org/internet-drafts/
> 
> This Internet-Draft can be retrieved at:
> ftp://ftp.ietf.org/internet-drafts/draft-ietf-ccamp-gmpls-general-
> constraints-ospf-te-02.txt
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