Re: [Idr] New Version Notification for draft-ietf-idr-large-community-11.txt

David Freedman <david.freedman@uk.clara.net> Sat, 03 December 2016 10:53 UTC

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From: David Freedman <david.freedman@uk.clara.net>
To: "idr@ietf.org" <idr@ietf.org>
Thread-Topic: [Idr] New Version Notification for draft-ietf-idr-large-community-11.txt
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Date: Sat, 3 Dec 2016 10:47:44 +0000
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Subject: Re: [Idr] New Version Notification for draft-ietf-idr-large-community-11.txt
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just had an offlist conversation with job, and he has recommended that I elaborate on this point as it may be non obvious to some.

The GA is intended to be an ASN, but IMHO AS_TRANS is not an ASN, it is a signal between peers in an OPEN exchange and a signal between hops that information is missing in some way, it is not an ASN in the sense that it should (or perhaps now even *could*) be used by anybody as a local ASN for a router.

As such I'm aware of code that exists which discriminates against AS_TRANS, there are various libraries which handle data structures like ASNs (which could be used in , say , creating or validating a GA field) which would be very unhappy if fed AS_TRANS as their initial input.

I understand we want to progress the draft , and that and a line has to be drawn between what could be unwise in implementations , vs what could be unwise to be seen on the internet , and that a registry can exist for the latter , but this is something I feel strongly should live on the former side , and if a list of values is going to be specified in the draft , I feel this should be in it (irony aside).

Dave 

> On 3 Dec 2016, at 10:14, David Freedman <david.freedman@uk.clara.net>; wrote:
> 
> last minute nit: if we are going to recommend that particular reserved ASNs are avoided for the global administrator, can we please include AS_TRANS (RFC6793), there is probably a certain irony in not doing so.
> 
> Dave