Re: [lisp] [Ila] LISP for ILA

Tom Herbert <tom@quantonium.net> Tue, 06 March 2018 02:24 UTC

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From: Tom Herbert <tom@quantonium.net>
Date: Mon, 05 Mar 2018 18:23:58 -0800
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To: Dino Farinacci <farinacci@gmail.com>
Cc: "Alberto Rodriguez Natal (natal)" <natal@cisco.com>, Fabio Maino <fmaino@cisco.com>, "ila@ietf.org" <ila@ietf.org>, "lisp@ietf.org" <lisp@ietf.org>, Albert Cabellos <acabello@ac.upc.edu>, "Vina Ermagan (vermagan)" <vermagan@cisco.com>
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Subject: Re: [lisp] [Ila] LISP for ILA
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On Mon, Mar 5, 2018 at 5:00 PM, Dino Farinacci <farinacci@gmail.com> wrote:
>> Looking at the map-reply message format, I am concerned about its
>> size. By my count, it's 40 bytes to provide one record with one
>> locator where record and locator are 8 bytes. If we need to scale a
>> system to billions of nodes this overhead could be an issue even if
>> it's the control plane. Is there any plan to have a compressed version
>> of this. For instance ,if there is only one RLOC returned wouldn't the
>> priorities and weights be useless?
>
> My comment about this spec is that you really don’t need a LCAF format to format the addresses. You can use AFI=2 and use IPv6 format. That will reduce the size.
>
> But if you start compressing out fields, reality will set in and new features will be added and you’ll be back where we started. You want to multi-home, don’t you?

There are a bunch of reserved and unused flag bits in the message
format. One could define flag-fields to make the messages extensible
and variable length (without resorting to TLVs!).

Tom