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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, 28 April 2017 14:54 UTC

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From: "John G. Scudder" <jgs@juniper.net>
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Date: Fri, 28 Apr 2017 10:49:26 -0400
CC: Christopher Morrow <morrowc.lists@gmail.com>, Interminable Discussion Room <idr@ietf.org>
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To: Randy Bush <randy@psg.com>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/idr/UOrm0vlXn0yvSmt31_d88la4NcY>
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 Apr 28, 2017, at 10:13 AM, Randy Bush <randy@psg.com> wrote:
> is there a big enough win to break POLA?

(Principle of Least Astonishment.)

Yes, that's the main question this thread has been debating, thanks for summarizing. Another way it's been put is to ask whether the cost/benefit analysis holds up. Violation of POLA is on the "cost" side of the ledger. One of the arguments that it should not be considered to be a very high cost is that there are ways to mitigate POLA with careful implementation; some examples have been discussed. I guess you might then add a "designing good software is hard" line item to the "cost" side.

Do you have an opinion as to the answer to your well-summarized question?

--John

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