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Re: Reference based Routing (RbR)

Brian E Carpenter <brian.e.carpenter@gmail.com> Sun, 24 May 2020 20:37 UTC

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Subject: Re: Reference based Routing (RbR)
To: tony.li@tony.li, Robert Raszuk <robert@raszuk.net>
Cc: 6man <6man@ietf.org>, 6man WG <ipv6@ietf.org>
References: <CAOj+MMHvKpD1b2rbViZtdjtEFz2FEEH3jt4C8+6Kod+h0yEXMQ@mail.gmail.com> <384EB737-E83F-4FA7-B779-AC380D3C59AD@tony.li> <CAOj+MMGh-L3TRsdPyiaXRKwhYz2+kF+xhWE3N3Lc+hnPv4dkQQ@mail.gmail.com> <82165E20-884F-467B-B364-1B0A8B84A38A@tony.li>
From: Brian E Carpenter <brian.e.carpenter@gmail.com>
Organization: University of Auckland
Message-ID: <5ee30dc5-a73f-f4e7-71a0-729b52b1a8aa@gmail.com>
Date: Mon, 25 May 2020 08:36:51 +1200
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Hi Tony,

On 25-May-20 06:10, tony.li@tony.li wrote:
> 
> Hi Robert,
> 
>> If I would insert a reference into flow label space I am afraid I would lose the current flow label functionality which perhaps in some cases may not be desired. 
> 
> 
> Is someone actually using the flow label?  As far as I know it’s wholly unused.

It's set according to RFC 6437 by all modern Linux and Windows hosts for both TCP and UDP traffic. To what extent it's being used for load balancing is hard to tell, but
it isn't free for traffic engineering.

My own reaction to Robert's proposal is that it did indeed sound like a description of a way to use MPLS labels. 

<snip>
 
> Changing the semantics of any part of the address space may require more semantic and pragmatic changes than would be necessary via other approaches.

Overloading part of the interface identifier with local semantics is an obvious temptation, and really no more shocking than RFC8273. I am much more bothered by proposals to encode semantics in high order address bits.

But anyway... routing area topic? It doesn't seem to need any 6MAN action whatever.

   Brian

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