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Re: [Idr] WG LC on draft-ietf-idr-large-community-03.txt (10/17/2016 to 10/31/2016)

Robert Raszuk <robert@raszuk.net> Fri, 21 October 2016 16:49 UTC

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References: <20161018191521.GT95811@Vurt.local> <9EFC9BAA-F917-4C70-A139-1F69CAECF9C0@pfrc.org> <20161020215938.GE1074@Vurt.local> <adb00bcd7b8e45db857eae7019c646fc@XCH-ALN-014.cisco.com> <ae5da282-201c-f745-9f26-67ce73826bd5@i3d.net> <CA+b+ERkV2PBtzzx=uoygDzvTyJzunROCNX=0Y4phvGdn=oK5Xw@mail.gmail.com> <20161021154958.GR27221@gir.theapt.org> <CA+b+ERmrzCtFLP98D0YzRc-BJNbBWp3Ce6yKZr2cg1_QS0Oz5w@mail.gmail.com> <2ddbfbaf-7b99-53b9-365c-269fcc7746e7@i3d.net> <CA+b+ERn6dG+R8+UV-jaRXAV7eWQBygqEQp4VY4x1yKukpVKhTA@mail.gmail.com> <20161021164241.GC32387@Vurt.local>
From: Robert Raszuk <robert@raszuk.net>
Date: Fri, 21 Oct 2016 18:49:49 +0200
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To: Job Snijders <job@instituut.net>
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Cc: IETF IDR WG <idr@ietf.org>, Peter Hessler <phessler@theapt.org>
Subject: Re: [Idr] WG LC on draft-ietf-idr-large-community-03.txt (10/17/2016 to 10/31/2016)
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Hey Job,

That's what I thought ... but if so I do not get why there are so many
discussions of any MUSTs/SHOULDs/MAYs operators are expected to follow on
in the fields LCs provides.

If they are opaque that means there is zero structure in place and everyone
is free to put whatever he/she likes in it .. even hex encoded Morse (
https://goo.gl/rHcGeV)

We either allow all opaque and free style or we structure fields such that
for example they may be used in simple parametrized BGP in/out policy
example I provided.

And the excuses type "oh we can not structure it as there is no way to
insert valid ASN" are wrong as there is a way as proven :)

Cheers,
R.



On Fri, Oct 21, 2016 at 6:42 PM, Job Snijders <job@instituut.net> wrote:

> On Fri, Oct 21, 2016 at 06:29:46PM +0200, Robert Raszuk wrote:
> > The policy example was nothing to do with BGP table. If I am receiving
> > BGP_UPDATE it comes with AS_PATH and may contain LC. So if I want very
> > simple policy to filter trash of LCs I can set it to match first 4
> > octets to any ASN present in the same UPDATE MSG AS_PATH attribute. If
> > it there I do not drop LC.
>
> A clever trick, but not a good fit for Large BGP Communities. Large BGP
> Communities are opaque, by definition and design.
>
> We want routing policy in which networks can send 2914:X:Y to us, and we
> can send 2914:A:B to them - very much like RFC 1997 communities. The
> Global Administator field does not necessarily contain the ASN of the
> sending party.
>
> Kind regards,
>
> Job
>
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