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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

Job Snijders <job@ntt.net> Thu, 20 April 2017 09:09 UTC

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Date: Thu, 20 Apr 2017 11:09:41 +0200
From: Job Snijders <job@ntt.net>
To: Enke Chen <enkechen@cisco.com>
Cc: John Scudder <jgs@juniper.net>, idr wg <idr@ietf.org>, Hares Susan <shares@ndzh.com>
Message-ID: <20170420090941.c5yi72mzleto64ph@hanna.meerval.net>
References: <D4E812E8-AA7B-4EA2-A0AC-034AA8922306@juniper.net> <abe393d3-d1e4-7841-4620-38dab751765b@cisco.com> <CA+b+ERnRz8BEO3mb1fnsDPoiL6Wxjdfw9vQPbyODNEa+xCJdnw@mail.gmail.com> <D51D67E4.A9782%acee@cisco.com> <AF07526F-F08B-4084-937B-A9A2D2DD2813@juniper.net> <2b8a94bb-4f40-6c1d-05ff-9cf11ad93646@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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On Wed, Apr 19, 2017 at 04:34:10PM -0700, Enke Chen wrote:
> I had "in this case" with the statement "the default can not be changed".
> The reason is that the behavior change may completely cutoff connectivity
> in this case.

And very soon after the cutoff a customer may elect to roll back the
change and read the release notes!

The 'complete cutoff' only occurs after a specific sequence of events
which together would represent a cascading failure in due diligence. 

Given that we've suffered through decennia of insecure behaviour on some
platforms, I'd be careful to weigh the cost of such a self-inflicted
'complete cutoff' against the cost on internet operations in general to
persist in the folly behaviour that some platforms present.

Kind regards,

Job

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