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Re: [Idr] Vendor Defaults (was Re: Review of draft-ietf-large-community-06.txt)

Gert Doering <gert@space.net> Mon, 07 November 2016 16:21 UTC

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Date: Mon, 07 Nov 2016 17:20:59 +0100
From: Gert Doering <gert@space.net>
To: "Jakob Heitz (jheitz)" <jheitz@cisco.com>
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References: <CAH1iCiq6jNtnkta0Bt952EQ9zOKSGt=_cCySsT5XuOKuHYO2nQ@mail.gmail.com> <86860386-9C2B-4BD5-B457-2A6DA5446CF3@cisco.com> <17E646EF-4633-423B-9AC4-B53D49C90632@gmail.com> <CA+b+ERk8NgT4RB9Hv_yrPRb2Gv2RVU9EjXUpdMc=mg0U7TeykQ@mail.gmail.com> <20161107121251.GT79185@Space.Net> <CA+b+ER=8U7kww=8KpOjSDh=XpK+O2LVmStLDf4KuG+FGjp3-UQ@mail.gmail.com> <B245D36A-DB4D-402E-87ED-3DBF31699B2B@cisco.com>
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Cc: heasley <heas@shrubbery.net>, idr wg <idr@ietf.org>, Robert Raszuk <robert@raszuk.net>
Subject: Re: [Idr] Vendor Defaults (was Re: Review of draft-ietf-large-community-06.txt)
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Hi,

On Mon, Nov 07, 2016 at 04:14:32PM +0000, Jakob Heitz (jheitz) wrote:
> 5539:100 is used by 5539 to tell its neighbors that the route was learned in Frankfurt/DECIX.
> http://www.space.net/static/bgp_communities.html

Indeed, and sorry for the 5539:70 and 5539:130 example, these were 
obviously incorrect - the list (and our configs) say it's 5539:3070,
5539:3100 and 5539:3130 to set local-pref in our network.

But this example prominently documents why operators think that the model
"5539 defines the namespace for 5539:*" is the only thing that makes sense
- there are communities set *by* 5539, to declare "information about a 
prefix", and there are other community values sent *to* 5539 to cause some 
sort of policy effect in our network, but both have to be declared by 
5539 to be a valid reflection of our configured BGP policy.

2914:5539 would not have any meaning for us, even if it might tell 2914
"do not announce to 5539" or anything else - not our namespace.

Gert Doering
        -- NetMaster
-- 
have you enabled IPv6 on something today...?

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