Re: [CCAMP] New Liaison Statement, "LS86 - Comments on WSON Impairment Work in CCAMP"

["BRUNGARD, DEBORAH A (ATTLABS)" <db3546 at att.com>]

All,

Please note this email is outside of the ITU-IETF Liaison process and is
not a formal response from CCAMP. Please treat as such.

CCAMP,
The proper ITU-IETF Liaison procedure is to first discuss the response
within the Working Group and then for the Chairs to convey the Working
Group response. We welcome all input for responding to Liaisons. Please
direct input to the CCAMP list.

Deborah and Lou

-----Original Message-----
From: Greg Bernstein [mailto:gregb at grotto-networking.com] 
Sent: Friday, October 30, 2009 3:03 PM
To: tsbsg15 at itu.int
Cc: BRUNGARD, DEBORAH A (ATTLABS); lberger at labn.net;
hiroshi.ota at itu.int; greg.jones at itu.int; ccamp at ietf.org;
malcolm.betts at huawei.com; yoichi.maeda at ntt-at.co.jp;
sjtrowbridge at alcatel-lucent.com; paf at cisco.com;
adrian.farrel at huawei.com; rcallon at juniper.net
Subject: Re: [CCAMP] New Liaison Statement, "LS86 - Comments on WSON
Impairment Work in CCAMP"

Hi folks, I just reviewed this liaison (LS-86) and had a few questions 
and thoughts (from a individual perspective not IETF, CCAMP...).
In section 3.1.1 of the WSON Impairments Framework draft we categorize 
the different types of impairment aware RWA computations. This section 
does not address "black links".

In section 3.1.2 we discuss impairment information sharing constraints. 
This section includes the information sharing constraints of a "black 
link". From our understanding of the "black link" concept, no impairment

parameters would be available for the control plane to share with 
computational entities for the subnetwork. We did not take this to mean 
that the owner of the "black link" would not know whether a path across 
that link was viable, or that all paths across the black link are
viable.

 From our understanding of "black links" it did not appear that every 
black link must be terminated by 3R regenerators as stated in the 
liaison: ""black link" is a viable pre engineered optical path between 
3R regenerators". We assumed that a black link could terminate on a 
receiver. Hence we took a more general view of a black link as an 
network element with unknown impairment properties whose impairment 
effects could be calculated by its owner (not the general control
plane).

Best Regards

Greg B.

Greg Jones(ITU-T SG 15) wrote:
> Title: LS86 - Comments on WSON Impairment Work in CCAMP
> Submission Date: 2009-10-27
> URL of the IETF Web page:
https://datatracker.ietf.org/public/liaison_detail.cgi?detail_id=603 
> Please reply by 2010-05-31
>
> From: Greg Jones(ITU-T SG 15) <tsbsg15 at itu.int>
> To: IETF ccamp Working Group(dbrungard at att.com,lberger at labn.net)
> Cc: paf at cisco.com
> adrian.farrel at huawei.com
> rcallon at juniper.net
> ccamp at ietf.org
> yoichi.maeda at ntt-at.co.jp
> sjtrowbridge at alcatel-lucent.com
> Reponse Contact: tsbsg15 at itu.int
> greg.jones at itu.int
> hiroshi.ota at itu.int
> Technical Contact: malcolm.betts at huawei.com
> Purpose: For comment 
> Body: 
> Attachment(s):
>      LS86 - Comments on WSON Impairment Work in CCAMP - pdf
(https://datatracker.ietf.org/documents/LIAISON/file719.pdf)
>
>
>
> _______________________________________________
> CCAMP mailing list
> CCAMP at ietf.org
> https://www.ietf.org/mailman/listinfo/ccamp
>
>
>   

-- 
===================================================
Dr Greg Bernstein, Grotto Networking (510) 573-2237