Re: [mpls] Warren Kumari's No Objection on draft-ietf-mpls-spring-entropy-label-11: (with COMMENT)

[Warren Kumari <[e-mail]>]

On Thu, Jul 5, 2018 at 7:43 AM <[e-mail]> wrote:

> Thanks Warren,
>
> I agree with your comments and I will address them in the next revision.
>

​Thanks!​



> You are right (at least from a theoretical point of view) about fast path
> vs slow path for ERLD. I think for this kind of switching implementation,
> we have several options: advertising the fast path ERLD (slow path will
> never be triggered), advertising the slow path ERLD (there is a possibility
> that slow path will be triggered for each packet), let this configurable by
> the user. I do not think that this fast path/slow path implementation is
> still popular at least for the SP router market.
>
>
​I'm fine with whatever you select, I just wanted it to be considered.​
W



> -----Original Message-----
> From: Warren Kumari [mailto:[e-mail]]
> Sent: Wednesday, July 04, 2018 20:04
> To: The IESG
> Cc: [e-mail]; [e-mail];
> [e-mail]; [e-mail];
> [e-mail]; [e-mail]; [e-mail]; [e-mail]
> Subject: Warren Kumari's No Objection on
> draft-ietf-mpls-spring-entropy-label-11: (with COMMENT)
>
> Warren Kumari has entered the following ballot position for
> draft-ietf-mpls-spring-entropy-label-11: No Objection
>
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> The document, along with other ballot positions, can be found here:
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>
>
> ----------------------------------------------------------------------
> COMMENT:
> ----------------------------------------------------------------------
>
> Thank you for writing this - it provides useful functionality.
>
> Please see Joe Clarke's OpsDir review here:
>
> https://datatracker.ietf.org/doc/review-ietf-mpls-spring-entropy-label-11-opsdir-lc-clarke-2018-06-25/
>  - it mirrors comments made by a number of ADs, and also contains a
> significnat
> number of nits (which would make the document better / more readable).
>
> I had a question:
> Section 4.  Entropy Readable Label Depth
> " The Entropy Readable Label Depth (ERLD) is defined as the number of
>    labels a router can both:
>    a.  Read in an MPLS packet received on its incoming interface(s)
>        (starting from the top of the stack).
>    b.  Use in its load-balancing function."
> ...
> "In a distributed switching architecture, each linecard may have a
> different
> capability in terms of ERLD."
>
> In many cases, a device may have a different readable label depth in
> hardware /
> fastpath than it does by punting the packet to the CPU / control plane.
> Perhaps
> the ERLD should be defined as 'Use in its load-balancing function in the
> dataplace / fast-path" (or something, this will need some wording).
>
> I'd also like to say that I like Section 10 (Options considered) - sections
> like this make a document much more satisfying (otherwise one has niggling
> questions like "What didn't they do single ELs at the bottom of the
> stack?!") -
> thank you for including it.
>
> I also have some nits:
> Section 1.  Introduction
> "The hashing technique is required to perfom a per-flow load-balancing and
> thus
> prevent packet disordering. " 1: Perform is a type 2: While 'disordering'
> explains it well, 'reordering' is a much more common term, and will (I
> think)
> cause less confusion.
>
> "The MPLS architecture brings some challenges on the load-balancing as an
> LSR
> (Label Switch Router) should be able to look at header fields that are
> beyond
> the MPLS label stack." "on the load-balancing" doesn't really parse.
> Perhaps:
> "... brings some load-balancing challenges, as..."?
>
> Section 2.  Abbreviations and Terminology
> SRGB is not defined on first use, nor it is in the Terminology section.
> Also,
> sorting this alphabetically would be appreciated.
>
>
>
>
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-- 
I don't think the execution is relevant when it was obviously a bad idea in
the first place.
This is like putting rabid weasels in your pants, and later expressing
regret at having chosen those particular rabid weasels and that pair of
pants.
   ---maf