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Re: I-D Action: draft-filsfils-6man-structured-flow-label-00.txt

"Ahmed Abdelsalam (ahabdels)" <ahabdels@cisco.com> Tue, 13 April 2021 08:47 UTC

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From: "Ahmed Abdelsalam (ahabdels)" <ahabdels@cisco.com>
To: Brian E Carpenter <brian.e.carpenter@gmail.com>, Ron Bonica <rbonica@juniper.net>, "6man@ietf.org" <6man@ietf.org>, "draft-filsfils-6man-structured-flow-label@ietf.org" <draft-filsfils-6man-structured-flow-label@ietf.org>
Subject: Re: I-D Action: draft-filsfils-6man-structured-flow-label-00.txt
Thread-Topic: I-D Action: draft-filsfils-6man-structured-flow-label-00.txt
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Date: Tue, 13 Apr 2021 08:47:30 +0000
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Inline [AA]

-----Original Message-----
From: Brian E Carpenter <brian.e.carpenter@gmail.com>
Date: Monday, 12 April 2021 at 22:41
To: ahabdels <ahabdels@cisco.com>, Ron Bonica <rbonica@juniper.net>, "6man@ietf.org" <6man@ietf.org>, "draft-filsfils-6man-structured-flow-label@ietf.org" <draft-filsfils-6man-structured-flow-label@ietf.org>
Subject: Re: I-D Action: draft-filsfils-6man-structured-flow-label-00.txt

    On 13-Apr-21 04:01, Ahmed Abdelsalam (ahabdels) wrote:
    > Hi Ron,
    > 
    > Thanks for reading the draft. I think we agree on the problem statement 
    > 
    > In our view using a 256-bit HopByHop extension header to encode a 1-bit flag, is far from efficient.
    > 
    > Also, as you point out, the proposed update in draft-hinden-6man-hbh-processing (which in my view is going in the right direction), limits HBH to one single header with one single option. If we encode the flag in a HbH option, we won’t be able to use HBH for anything else.
    > 
    > Structured FL can be used for packet marking while HBH can be used in many other use-cases that require more than simple packet marking.

    But there is no such thing as a structured flow label, because the standard specifies it as a 20-bit pseudo-random value. As my and other replies have shown, the proposal is not a backwards compatible change except possibly in limited domains. From a glance at my inbox, that has now become the main topic of discussion.

[AA] Brain, Yes. This draft targets limited domain. We highlighted this in Recommended Design section and in next revision we are going to state this at the beginning of the draft.

       Brian

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