Subject: Re: [CCAMP] 转发: New Version Notification for draft-zheng-ccamp-gmpls-g709v5-fwk-00.txt

From: Gert Grammel <[email-masked]>
Date: Mon, 6 Mar 2017 11:54:34 +0000

Haomian,

Thank you for considering a framework document about ODU4 and ODUCn and beyond 100G structures. This draft is certainly a good starting point.  That said, as G.709v5 includes the digital (ODUk/ODUCn layer) and optical layer considerations and my preference would be to see both tackled in one framework document, but obviously that is a choice of the authors. 
Few quick comments related to the current draft:
- What kind of confused me was the statement "This document focuses on only the control of the ODUk/ODUCn layer." In combination with " The optical layer control will be addressed in a separate document." It appears to me that with this split the digital part of OTUCn is not covered in either document. As the digital structure of an OTUC1 is not the same as an OTU4, it would make sense to either consider it in this framework or spell out that it is considered in a different one.
- In G.709v5 an OTU can be mapped onto OTL3.4 or OTL4.4. those OTL are digital structures but may be considered in the "optical layer framework" (see above). If that was the intention it would be great to spell it out.
- While in the past a client signal mapping followed client->OPU->ODU->OTU mappings, the new scheme suggests a mapping like client->OPU->ODTU->ODTUG->OPUCn->ODUCn->OTUCn (Figure 7-1 – OTN multiplexing and mapping structures). Shouldn't that be captured in Figure-1? 
- G.709v5 defines SOTU (single OTU) and MOTU (multiple OTU) interfaces. SOTU looks like what we know from OTUk interfaces using a single wavelength carrying a single OTU. A MOTU interface looks like e.g. a 400G interface stripped into 4 wavelength@100G, each of them considered an OTU. So here a ODUC4 may end up stripped into 4 OTUC1. As this has impact on routing and signalling decisions for wavelength, it would be great to cover the concept.

Best

Gert

On 2017-03-17, 11:05, "CCAMP on behalf of Zhenghaomian" <[email-masked] on behalf of [email-masked]> wrote:

    Dear CCAMPers, 
    
    Please find a new draft uploaded as follow. In this work we target on summarize the architecture and requirement comes from latest OTN data plane recommendation, [ITU-T G.709v5]. We summarized some previous discussions in the working group, together with corresponding gmpls implications described in this work. 
    
    You are more than welcomed to review the document and provide comments, thank you. 
    
    Best wishes,
    Haomian
    
    -----邮件原件-----
    发件人: [email-masked] [mailto:[email-masked]] 
    发送时间: 2017年3月6日 18:00
    收件人: Daniele Ceccarelli; Zhenghaomian; Daniel King; Zafar Ali; Sergio Belotti; Zhenghaomian; Italo Busi
    主题: New Version Notification for draft-zheng-ccamp-gmpls-g709v5-fwk-00.txt

    A new version of I-D, draft-zheng-ccamp-gmpls-g709v5-fwk-00.txt
    has been successfully submitted by Haomian Zheng and posted to the IETF repository.
    
    Name:		draft-zheng-ccamp-gmpls-g709v5-fwk
    Revision:	00
    Title:		Framework for GMPLS Control of Optical Transport Networks in G.709 Edition 5
    Document date:	2017-03-06
    Group:		Individual Submission
    Pages:		11
    URL:            https://www.ietf.org/internet-drafts/draft-zheng-ccamp-gmpls-g709v5-fwk-00.txt
    Status:         https://datatracker.ietf.org/doc/draft-zheng-ccamp-gmpls-g709v5-fwk/
    Htmlized:       https://tools.ietf.org/html/draft-zheng-ccamp-gmpls-g709v5-fwk-00

    Abstract:
       The International Telecommunication Union Telecommunication
       Standardization Sector (ITU-T) has extended its Recommendations
       Optical Transport Networks (OTNs, G.709) to edition 5 to support new
       features, including beyond 100 Gbps (B100G) OTN containers.
    
       This document summarizes the architecture and requirements, and
       provides corresponding control plane considerations to guide
       protocol extensions development in support of OTNv5 control
       mechanisms.

    
    Please note that it may take a couple of minutes from the time of submission until the htmlized version and diff are available at tools.ietf.org.
    
    The IETF Secretariat
    
    _______________________________________________
    CCAMP mailing list
    [email-masked]
    https://www.ietf.org/mailman/listinfo/ccamp