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

Peter Hessler <phessler@theapt.org> Fri, 21 October 2016 15:50 UTC

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Date: Fri, 21 Oct 2016 17:49:58 +0200
From: Peter Hessler <phessler@theapt.org>
To: Robert Raszuk <robert@raszuk.net>
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References: <01f301d228b4$e3319ef0$a994dcd0$@ndzh.com> <20161017215134.GA464@pfrc.org> <20161018190851.GC15392@shrubbery.net> <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>
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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 2016 Oct 21 (Fri) at 17:42:37 +0200 (+0200), Robert Raszuk wrote:
:Hi Martijn,
:
:> Secondly, there's literally no way for the vendor to check whether an
:> ASN belongs to "the entity that defines the meaning of the rest of the
:> Large Community"
:
:Why not ?
:
:If you do not make those 4 octets configurable by spec and always fill it
:with AS number defined in your BGP instance you will have assurance it
:is ASN of the entity that defines the rest 8 octets of the LC as otherwise
:you will likely not establish any EBGP sessions to your peers.
:
:So there is very easy way to enforce it today in any BGP implementation.

Say I am AS 1234, and I want to control AS 5678.  My transit ISP is AS
9876.

If I set

local-as 1234
peer-as 9876
set large-community 5678:666:1

How is the implementation supposed to know to allow it?

Limitations in the implementation completely defeat the purpose of this
spec.


:However the question is should it be enforced at all ?
:

MUST NOT is a very important part of this spec, and is enforced a few
times in the document.


:Best,
:R.
:




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