Re: [Idr] Unknown Attributes seen in the wild

"Jakob Heitz (jheitz)" <jheitz@cisco.com> Sun, 30 October 2016 19:40 UTC

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From: "Jakob Heitz (jheitz)" <jheitz@cisco.com>
To: Colin Petrie <colin@spakka.net>
Thread-Topic: [Idr] Unknown Attributes seen in the wild
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Date: Sun, 30 Oct 2016 19:40:18 +0000
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References: <01f401d22950$7f988470$7ec98d50$@ndzh.com> <5806484F.5080006@foobar.org> <6E6CFB88-04E7-45B6-A325-F57A165E901A@pfrc.org> <20161018172538.GD27221@gir.theapt.org> <01e301d22967$cb3e8c50$61bba4f0$@ndzh.com> <alpine.LRH.2.20.1610212230270.31112@espargaro.jakma.org> <b65b4b10-6635-05f5-035c-66b94f0c8b84@spakka.net> <CA+b+ERk5=rbUGXk32cgjW=cOQDg+O+k4jK4hK1HpX7S0M34QTA@mail.gmail.com>, <efe998a5-869e-dcb7-e51f-a28a1a16c70b@spakka.net>
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Cc: idr wg <idr@ietf.org>, Robert Raszuk <robert@raszuk.net>
Subject: Re: [Idr] Unknown Attributes seen in the wild
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There is no concept of a BGP attribute being "restricted" to a safi. If that were the case, then you could use a single attribute code for completely different attributes in different safis. An attribute that is understood in one safi, but nonsense in a second safi will cause a malformed update rather than an unknown attribute when received in the second safi. 

Thanks,
Jakob.

> On Oct 30, 2016, at 12:16 PM, Colin Petrie <colin@spakka.net>; wrote:
> 
>> On 30/10/16 19:05, Robert Raszuk wrote:
>> The good news is that they should not be leaked as they are to be send
>> in their dedicated SAFIs so unless peer exchanges right capabilities
>> they should be quite contained.
> 
> In this case, we see them appear on BGP sessions that only negotiate
> IPv4/Unicast or IPv6/Unicast.
> 
> Cheers,
> Colin
> 
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