Re: [Idr] Unknown Attributes seen in the wild

Paul Jakma <> Fri, 21 October 2016 21:32 UTC

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Date: Fri, 21 Oct 2016 22:32:39 +0100 (BST)
From: Paul Jakma <>
To: Susan Hares <>
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Subject: Re: [Idr] Unknown Attributes seen in the wild
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On Tue, 18 Oct 2016, Susan Hares wrote:

> Do we know which routers are sending path attributes with 20 or 21?

I don't know about #20, but Quagga had support for AS_PATHLIMIT for a 
while. I added it in '07 and removed it from the upstream code in '11.

> Sue

> -----Original Message-----
> From: Idr [] On Behalf Of Peter Hessler
> Sent: Tuesday, October 18, 2016 1:26 PM
> To:
> Subject: [Idr] Unknown Attributes seen in the wild

> I just did a check of the DFZ, both IPv4 and IPv6, and these are the
> unknown/deprecated attributes on paths that I can see.
> 20 	Connector Attribute (deprecated) 	[RFC6037]
> 21 	AS_PATHLIMIT (deprecated) 	[draft-ietf-idr-as-pathlimit]

Paul Jakma | | @pjakma | Key ID: 0xD86BF79464A2FF6A
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