Re: [Pce] Barry Leiba's No Objection on draft-ietf-pce-lsp-control-request-09: (with COMMENT)

Dhruv Dhody <> Mon, 30 September 2019 11:29 UTC

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From: Dhruv Dhody <>
Date: Mon, 30 Sep 2019 16:59:19 +0530
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To: Barry Leiba <>
Cc: The IESG <>,, Hariharan Ananthakrishnan <>, pce-chairs <>,
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Subject: Re: [Pce] Barry Leiba's No Objection on draft-ietf-pce-lsp-control-request-09: (with COMMENT)
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Hi Barry,

Thanks for your review. Snipping to just one point -

> — Section 4 —
>    The D Flag and C
>    Flag are mutually exclusive in PCUpd message.  The PCE SHOULD NOT
>    send control request for LSP which is already delegated to the PCE,
>    i.e. if the D Flag is set in the PCUpd message, then C Flag SHOULD
>    NOT be set.
> I’m confused: “mutually exclusive” means that they can’t both be set.  So why
> SHOULD NOT and not MUST NOT?  (You’re also missing a few articles here: ”a
> PCUpd message”, “a control request”, “an LSP”, and “the C Flag”.

I think the reason for SHOULD NOT was because when a PCC receives this
- it would simply ignore it!
This did not rise to the level of error usual for MUST NOT!

If you feel that the above isn't a good enough reason, changing would
not cause any harm either.