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

Job Snijders <job@instituut.net> Fri, 21 October 2016 16:42 UTC

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Date: Fri, 21 Oct 2016 18:42:41 +0200
From: Job Snijders <job@instituut.net>
To: Robert Raszuk <robert@raszuk.net>
Message-ID: <20161021164241.GC32387@Vurt.local>
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>
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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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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