Re: [Idr] FW: Large BGP Communities beacon in the wild

Job Snijders <job@ntt.net> Tue, 11 October 2016 18:51 UTC

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Date: Tue, 11 Oct 2016 20:51:29 +0200
From: Job Snijders <job@ntt.net>
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Subject: Re: [Idr] FW: Large BGP Communities beacon in the wild
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On Tue, Oct 11, 2016 at 05:29:50PM +0200, Job Snijders wrote:
> This message was posted to various operational mailing lists.
> 
> TL;DR - there are now two beacons carrying a Large BGP Community in the
> DFZ. On IPv4 we observe full coverage from the NLNOG RING LG - on IPv6
> not so much.

We tracked down the IPv6 discrepency: All the looking glass peers that
don't propagate the Large Community to the Looking Glass are Cisco IOS
boxes.

These IOS boxes won't send attribute 30 (and possibly other unknown
attributes) over IPv6 BGP sessions which are _not_ configured with
'send-community'.

Kind regards,

Job