Re: [spring] WG Adoption Call for draft-dong-spring-sr-for-enhanced-vpn

Greg Mirsky <gregimirsky@gmail.com> Wed, 29 July 2020 12:58 UTC

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From: Greg Mirsky <gregimirsky@gmail.com>
Date: Wed, 29 Jul 2020 05:57:57 -0700
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To: James Guichard <james.n.guichard@futurewei.com>
Cc: "spring@ietf.org" <spring@ietf.org>, "spring-chairs@ietf.org" <spring-chairs@ietf.org>
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Subject: Re: [spring] WG Adoption Call for draft-dong-spring-sr-for-enhanced-vpn
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Dear WG Chairs, Authors,
I think I need to clarify my view regarding the WG adoption of this draft.
I share concerns expressed by Tarek. Also, it is not clear the role of
resource-SID in the case of FlexE underlay. And it does appear that an SR
node will maintain state per resource-SID it is provisioned by the
controller. That, in my opinion, breaks the SR paradigm of no per-flow
state at intermediate SR nodes. I believe that any solution to the problem
of SR-TE should be weighted against the work on Transport Slicing at the
TEAS WG.

Regards,
Greg

On Tue, Jul 28, 2020 at 8:47 AM Greg Mirsky <gregimirsky@gmail.com> wrote:

> Dear Authors,
> thank you for that well-written document. It was a pleasure to read. I
> have a number of questions and much appreciate it if you can clarify them
> for me:
>
>    - how you envision mapping resources to a topological SID, e.g.
>    adj-SID? Would it be 1:1, i.e., a new SID for each resource that
>    characterizes a link in a virtual network?
>    - how granular association of a resource with a SID could practically
>    be? For example, BW may be de-composed into, per. RFC 6003, CIR, CBS, EIR,
>    and EBS. Do you expect a transient SR node to do policing and/or shaping
>    according to such resource information?
>    - I agree, that FlexE is one of Layer 2 technologies to provide
>    predictable, in regard to performance, transport. What benefits of using
>    resource information you see for FlexE? Would an intermediate node manage
>    the FlexE calendar?
>
> Regards,
> Greg
>
> On Wed, Jul 15, 2020 at 4:17 AM James Guichard <
> james.n.guichard@futurewei.com> wrote:
>
>> Dear WG:
>>
>>
>>
>> This email begins a 2 week WG adoption call for
>> https://datatracker.ietf.org/doc/draft-dong-spring-sr-for-enhanced-vpn/
>> ending Wednesday 29th July 2020.
>>
>>
>>
>> Please speak up if you support or oppose adopting this document into the
>> WG. Please also provide comments/reasons for that support (or lack
>> thereof). Silence will not be considered consent.
>>
>>
>>
>> Thanks!
>>
>>
>>
>> Jim, Joel & Bruno
>>
>>
>>
>>
>>
>>
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>