Re: [Isis-wg] 答复: WG Last Call for draft-ietf-isis-segment-routing-msd-07

Paul Mattes <pamattes@microsoft.com> Thu, 21 December 2017 19:59 UTC

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From: Paul Mattes <pamattes@microsoft.com>
To: Xuxiaohu <xuxiaohu@huawei.com>, "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>, "Ketan Talaulikar (ketant)" <ketant@cisco.com>, Christian Hopps <chopps@chopps.org>, "isis-wg@ietf.org" <isis-wg@ietf.org>
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Subject: Re: [Isis-wg] =?utf-8?b?562U5aSNOiAgV0cgTGFzdCBDYWxsIGZvciBkcmFmdC1p?= =?utf-8?q?etf-isis-segment-routing-msd-07?=
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I agree. The term "Maximum SID Depth" is ambiguous, and that it represents the maximum label-imposition depth rather than the maximum label-read depth is a historical artifact rather than an indication of its relative importance. Better that the names and acronyms should directly reflect these two distinct concepts.

        pdm

-----Original Message-----
From: Isis-wg [mailto:isis-wg-bounces@ietf.org] On Behalf Of Xuxiaohu
Sent: Wednesday, December 20, 2017 8:40 PM
To: Les Ginsberg (ginsberg) <ginsberg@cisco.com>om>; Ketan Talaulikar (ketant) <ketant@cisco.com>om>; Christian Hopps <chopps@chopps.org>rg>; isis-wg@ietf.org
Cc: isis-ads@ietf.org; draft-ietf-isis-segment-routing-msd@ietf.org
Subject: [Isis-wg] 答复: WG Last Call for draft-ietf-isis-segment-routing-msd-07

Hi Les,

If I understand it correctly, the MSD concept was originated from (https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Ftools.ietf.org%2Fhtml%2Fdraft-ietf-pce-segment-routing-11%23page-7&data=02%7C01%7Cpamattes%40microsoft.com%7C757ccfb23bad4b5e33bf08d5481c2f29%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C636494208255322142&sdata=v7qCqA3gbbQSpEzlxNEVco0c9nHl1Cu6OelBNKnrTDA%3D&reserved=0) as described below:

"The "Maximum SID Depth" (1
   octet) field (MSD) specifies the maximum number of SIDs (MPLS label
   stack depth in the context of this document) that a PCC is capable of
   imposing on a packet."

Before considering expanding the semantics of the MSD concept as defined in the above PCE-SR draft, how about first considering renaming the capability of imposing the maximum number of labels so as to eliminate possible confusions, e.g., Writable Label-stack Depth (WLD) as opposed to the Readable Label-stack Depth (RLD) as defined in (https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Ftools.ietf.org%2Fhtml%2Fdraft-ietf-ospf-mpls-elc&data=02%7C01%7Cpamattes%40microsoft.com%7C757ccfb23bad4b5e33bf08d5481c2f29%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C636494208255322142&sdata=ejx66Ba86eQyHLwEu6m13swIFqRsWGY%2BEBqCbjNtSI8%3D&reserved=0) and (https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Ftools.ietf.org%2Fhtml%2Fdraft-ietf-isis-mpls-elc&data=02%7C01%7Cpamattes%40microsoft.com%7C757ccfb23bad4b5e33bf08d5481c2f29%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C636494208255322142&sdata=JLWqLM9dZp7A5j6iDguRulWZVuHWMIUZpBDIBC81zfo%3D&reserved=0) ?

Best regards,
Xiaohu

> -----邮件原件-----
> 发件人: Isis-wg [mailto:isis-wg-bounces@ietf.org] 代表 Les Ginsberg 
> (ginsberg)
> 发送时间: 2017年12月21日 4:02
> 收件人: Ketan Talaulikar (ketant); Christian Hopps; isis-wg@ietf.org
> 抄送: isis-ads@ietf.org; draft-ietf-isis-segment-routing-msd@ietf.org
> 主题: Re: [Isis-wg] WG Last Call for 
> draft-ietf-isis-segment-routing-msd-07
> 
> Ketan -
> 
> Thanx for the comments.
> I think we do want to allow MSD support for values other than 
> imposition values. We will revise the text so we are not restricted to only imposition cases.
> 
>   Les
> 
> 
> > -----Original Message-----
> > From: Ketan Talaulikar (ketant)
> > Sent: Wednesday, December 20, 2017 1:51 AM
> > To: Christian Hopps <chopps@chopps.org>rg>; isis-wg@ietf.org
> > Cc: isis-ads@ietf.org; draft-ietf-isis-segment-routing-msd@ietf.org
> > Subject: RE: [Isis-wg] WG Last Call for
> > draft-ietf-isis-segment-routing-msd-07
> >
> > Hello,
> >
> > I support this document and would like to ask the authors and WG to 
> > consider if we can expand the scope of this draft to not just 
> > "imposition" of the SID stack but also other similar limits related 
> > to other
> actions (e.g.
> > reading, processing, etc.). With Segment Routing, we are coming 
> > across various actions that nodes need to do with the SID stack for 
> > different purposes and IMHO it would be useful to extend the MSD 
> > ability to cover those as they arise.
> >
> > Thanks,
> > Ketan
> >
> > -----Original Message-----
> > From: Isis-wg [mailto:isis-wg-bounces@ietf.org] On Behalf Of 
> > Christian Hopps
> > Sent: 20 December 2017 14:03
> > To: isis-wg@ietf.org
> > Cc: isis-ads@ietf.org; draft-ietf-isis-segment-routing-msd@ietf.org
> > Subject: [Isis-wg] WG Last Call for
> > draft-ietf-isis-segment-routing-msd-07
> >
> >
> > The authors have asked for and we are starting a WG Last Call on
> >
> >  
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> > 0
> >
> > which will last an extended 4 weeks to allow for year-end PTO patterns.
> >
> > An IPR statement exists:
> >
> >
> > https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdat
> > atracker.ietf.org%2Fipr%2Fsearch%2F%3Fsubmit%3Ddraft%26id%3Ddraft-ie
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> > segment-routing-msd
> >
> > Authors please reply to the list indicating whether you are aware of 
> > any
> > *new* IPR.
> >
> > Thanks,
> > Chris.
> >
> > _______________________________________________
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