Re: [Idr] Robert Wilton's No Objection on draft-ietf-idr-capabilities-registry-change-08: (with COMMENT)

"Rob Wilton (rwilton)" <rwilton@cisco.com> Mon, 04 May 2020 10:51 UTC

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From: "Rob Wilton (rwilton)" <rwilton@cisco.com>
To: Alvaro Retana <aretana.ietf@gmail.com>, Robert Wilton via Datatracker <noreply@ietf.org>, The IESG <iesg@ietf.org>
CC: Susan Hares <shares@ndzh.com>, "idr-chairs@ietf.org" <idr-chairs@ietf.org>, "jgs@juniper.net" <jgs@juniper.net>, "idr@ietf.org" <idr@ietf.org>, "draft-ietf-idr-capabilities-registry-change@ietf.org" <draft-ietf-idr-capabilities-registry-change@ietf.org>
Thread-Topic: Robert Wilton's No Objection on draft-ietf-idr-capabilities-registry-change-08: (with COMMENT)
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Date: Mon, 4 May 2020 10:51:48 +0000
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Subject: Re: [Idr] Robert Wilton's No Objection on draft-ietf-idr-capabilities-registry-change-08: (with COMMENT)
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Hi Alvaro,

> -----Original Message-----
> From: Alvaro Retana <aretana.ietf@gmail.com>
> Sent: 04 May 2020 11:39
> To: Robert Wilton via Datatracker <noreply@ietf.org>rg>; The IESG
> <iesg@ietf.org>rg>; Rob Wilton (rwilton) <rwilton@cisco.com>
> Cc: Susan Hares <shares@ndzh.com>om>; idr-chairs@ietf.org; jgs@juniper.net;
> idr@ietf.org; draft-ietf-idr-capabilities-registry-change@ietf.org
> Subject: Re: Robert Wilton's No Objection on draft-ietf-idr-capabilities-
> registry-change-08: (with COMMENT)
> 
> On May 4, 2020 at 5:40:34 AM, Robert Wilton wrote:
> 
> 
> Rob:
> 
> Hi!
> 
> 
> > ----------------------------------------------------------------------
> > COMMENT:
> > ----------------------------------------------------------------------
> >
> > This document is straight forward and easy to read and understand. I had
> one
> > minor comment.
> >
> > [RFC5492] designates the range of Capability Codes 128-255 as
> > "Reserved for Private Use". Subsequent experience has shown this to
> > be not only useless, but actively confusing to implementors.
> >
> > It might possibly be helpful to expand this paragraph slightly.
> >
> > Because what was once "Reserved for Private Use" is now being
> reclassified
> > to something non private, I presume that there are no BGP
> implementations
> > using these capability codes that could be broken by this
> reclassification.
> > Hence, on the assumption that these codes are not in fact being used for
> > private use, it might be helpful to state that in order to help justify
> why
> > it is okay to make this change.
> 
> There *are* implementations using the code points on that range.  The
> WG has carefully surveyed implementations and is deprecating the known
> values (Table 2).

Okay.  I think that it might be helpful for the document to state this, both for readers who do not have that background, or in future when that knowledge has been forgotten.

Regards,
Rob


> 
> 
> Thanks!
> 
> Alvaro.