Re: [Idr] I-D Action: draft-ietf-idr-shutdown-01.txt

"John G. Scudder" <jgs@juniper.net> Wed, 30 November 2016 21:52 UTC

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From: "John G. Scudder" <jgs@juniper.net>
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Date: Wed, 30 Nov 2016 16:52:29 -0500
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References: <148052490104.3081.2049626653192295584.idtracker@ietfa.amsl.com> <20161130204903.GH10210@Vurt.local> <CC754B0F-B1FE-4C27-B39A-89BF58313CE9@pfrc.org> <828EC50E-0659-46F1-90E2-BD883A75A706@juniper.net> <8FCE845A-5DB6-4630-9F68-949C4B8D3D8F@pfrc.org> <b98866b0eac34bd4a2c7942334bdba90@XCH-ALN-014.cisco.com>
To: "Jakob Heitz (jheitz)" <jheitz@cisco.com>
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Subject: Re: [Idr] I-D Action: draft-ietf-idr-shutdown-01.txt
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On Nov 30, 2016, at 4:34 PM, Jakob Heitz (jheitz) <jheitz@cisco.com> wrote:
> I agree with Jeff.
> The potential to add future stuff to this field is quite limited,
> given that the field already exists and may have been used for other
> purposes. A text field is about as much as you could get away with
> under those circumstances. Please don't anyone say CRC.

SHA-3 HMAC, duh. :-)

What I dislike about leaving the string length out is that you're still going to have to police the overall data length to make sure it doesn't exceed 127 and decide what to do with any trailing data if it does. In effect, you've bitten off an implicit length field anyway by accepting the length restriction. Whether or not you think further extensibility matters is almost beside the point, but if it's available for "free" then I don't see a downside.

If the string's length were not limited to 127 then it would be a different story, but Job has made a principled argument for restricting the length.

--John