Re: [lisp] Rtgdir last call review of draft-ietf-lisp-gpe-04

Dino Farinacci <farinacci@gmail.com> Thu, 09 August 2018 16:15 UTC

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From: Dino Farinacci <farinacci@gmail.com>
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Date: Thu, 9 Aug 2018 09:15:40 -0700
Cc: rtg-dir@ietf.org, draft-ietf-lisp-gpe.all@ietf.org, lisp@ietf.org, ietf@ietf.org
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To: Adrian Farrel <adrian@olddog.co.uk>
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Subject: Re: [lisp] Rtgdir last call review of draft-ietf-lisp-gpe-04
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> No attempt is made in the document to explain how/why the reduction in size of
> some standard LISP header fields is acceptable. For example, if implementations
> of this spec can safely operate with a 16 bit Nonce or 8 bit Map-Versions, why
> does 6830/6830bis feel the need for 24 and 12 bit fields rspectively?

Note, you misread RFC6830. The Map-Version field is 24-bits when the V bit is set. And is divided up like this:

    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
    |N|L|E|V|I|flags|  Source Map-Version   |   Dest Map-Version    |
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
    |                 Instance ID/Locator-Status-Bits               |
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

Dino