Re: [RTG-DIR] RtgDir review: draft-ietf-spring-resiliency-use-cases-08

[<[e-mail]>]

Hi Stefano,

Speaking as doc Shepherd, I do not see in the V09, how you are addressing Lou's point about 1:1 and 1+1 protection in the Section 2.
I think it make sense to add a simple explicit statement that  SPRING should support both approach. It is partially addressed by " The two paths may be used concurrently or as a primary and backup
   path where the secondary path is used when the primary failed." 
But the "concurrently" word is IMO ambiguous as it could mean 1+1 scheme or ECMP like behavior.

Brgds,


-----Original Message-----
From: Stefano Previdi (sprevidi) [mailto:[e-mail]] 
Sent: Friday, April 28, 2017 12:54
To: Lou Berger
Cc: [e-mail]; [e-mail]; [e-mail]; [e-mail]
Subject: Re: RtgDir review: draft-ietf-spring-resiliency-use-cases-08

Hi Lou,

thanks for the comment. I integrated them in the new version I’ll submit asap.

Thanks.
s.


> On Apr 24, 2017, at 6:15 PM, Lou Berger <[e-mail]> wrote:
> 
> Hello,
> 
> I have been selected as the Routing Directorate reviewer for this draft.
> The Routing Directorate seeks to review all routing or routing-related 
> drafts as they pass through IETF last call and IESG review, and 
> sometimes on special request. The purpose of the review is to provide 
> assistance to the Routing ADs. For more information about the Routing 
> Directorate, please see 
> ​http://trac.tools.ietf.org/area/rtg/trac/wiki/RtgDir
> 
> Although these comments are primarily for the use of the Routing ADs, 
> it would be helpful if you could consider them along with any other 
> IETF Last Call comments that you receive, and strive to resolve them 
> through discussion or by updating the draft.
> 
> Document: draft-ietf-spring-resiliency-use-cases-08
> Reviewer: Lou Berger
> Review Date: April 24
> Intended Status: Informational
> 
> Summary:
> 
>    I have some minor comments about this document that I think would 
> be good, but not necessary, to be resolved before publication.
> 
> Comments:
> 
> This document is concise and clear.  I only have minor/nit level 
> issues that could be addressed before publication, but I don't think 
> it critical as the document is being published as Informational.
> 
> Major Issues:
> 
> 	No major issues found.
> 
> Minor Issues:
> 
> - Section 2 mentions reversion, while sections 3 and 4 do not.
>  This leaves reversion requirements open to interpretation.
>  I suggest explicitly stating if reversion is a required  option or 
> not in sections 3 and 4 as well.
> 
> - Section 2 mentions 1:1 style path protection.  Past/other work  on 
> protection also allowed for / uses 1+1 style protection.  Is
>  1+1 intentionally omitted? If not, I suggest allowing for it.
> 
> Nits:
> 
>>  referred to as local protection techniques or Fast Reroute  
>> techniques.
> 
> References should be provided for each technique.
> 
>>   It is essential that the primary and backup path benefit from an end-
>>   to-end liveness monitoring/verification.  The method and mechanisms
>>   that provide such liveness check are outside the scope of this
>>   document.
> 
> Given the importance of liveness monitoring, I think it would be worth 
> mentioned an example of such.
> 
> That's it!
> Lou
> 


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