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Re: [Idr] IETF LC for IDR-ish document <draft-ietf-grow-bgp-reject-05.txt> (Default EBGP Route Propagation Behavior Without Policies) to Proposed Standard

"John G. Scudder" <jgs@juniper.net> Fri, 21 April 2017 00:08 UTC

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From: "John G. Scudder" <jgs@juniper.net>
In-Reply-To: <11b08110-26e7-d67b-55f1-1f8cb777605e@cisco.com>
Date: Thu, 20 Apr 2017 20:08:09 -0400
CC: Job Snijders <job@ntt.net>, "idr@ietf.org" <idr@ietf.org>, Hares Susan <shares@ndzh.com>
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References: <D4E812E8-AA7B-4EA2-A0AC-034AA8922306@juniper.net> <abe393d3-d1e4-7841-4620-38dab751765b@cisco.com> <68B29403-9AD9-4F06-9FE4-3F077E793D9F@puck.nether.net> <275cf744-1f64-bcbc-dabe-a47479921230@cisco.com> <20170420154142.lacvtplusepy3qcf@hanna.meerval.net> <b57162ec-f806-6e86-7713-58608f72c468@cisco.com> <32C0B4EE-6241-49F9-97F2-7107AC68678D@juniper.net> <e513849d-f895-0499-7bf4-5ecb24cadab7@cisco.com> <4CE4AF1E-0C80-423E-B19D-5750FCAFAD89@juniper.net> <11b08110-26e7-d67b-55f1-1f8cb777605e@cisco.com>
To: Enke Chen <enkechen@cisco.com>
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Subject: Re: [Idr] IETF LC for IDR-ish document <draft-ietf-grow-bgp-reject-05.txt> (Default EBGP Route Propagation Behavior Without Policies) to Proposed Standard
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(still as an individual contributor)

> On Apr 20, 2017, at 5:25 PM, Enke Chen <enkechen@cisco.com> wrote:
> 
>> - on one hand, a worked example showing how an implementor could roll out the
>>  functionality without causing heartburn for users. (My paraphrase: expose the
>>  default in the configuration. When upgrading old->new, automatically create
>>  the corresponding configuration line(s) to configure for legacy behavior.)
> 
> Change of software may involve both upgrade and downgrade and combination (e.g.,
> when a serious issue is seen).
> 
> When the software is downgraded, the config may not be recognized and may be
> lost.

Sure. What of it? Presumably the downgraded software has the legacy behavior. When and if you re-upgrade it, the logic quoted above to emulate the legacy behavior is re-applied just like with the first upgrade. The net result is legacy behavior continues through upgrade and downgrade. (The next step in this argument is "but if you always maintain legacy behavior, what's the point?" but that's already been answered -- by Jared, IIRC -- much earlier in the thread.)

--John

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