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

Enke Chen <enkechen@cisco.com> Mon, 24 April 2017 18:02 UTC

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To: Mikael Abrahamsson <swmike@swm.pp.se>
References: <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> <23283_1492759950_58F9B58E_23283_375_1_53C29892C857584299CBF5D05346208A31CC352B@OPEXCLILM21.corporate.adroot.infra.ftgroup> <20170421084638.l6pbvtznfsxnq2wy@Vurt.local> <23291_1492766305_58F9CE61_23291_9725_1_53C29892C857584299CBF5D05346208A31CC399E@OPEXCLILM21.corporate.adroot.infra.ftgroup> <20170421095839.sralcy7aos5mzzic@Vurt.local> <d57ed214-945a-54b8-e04f-cb8610f789e4@cisco.com> <alpine.DEB.2.02.1704231447550.5591@uplift.swm.pp.se> <ee6e3ad8-d5c2-16c5-4464-3473d9a6443a@cisco.com> <alpine.DEB.2.02.1704240928120.5591@uplift.swm.pp.se>
Cc: "idr@ietf.org" <idr@ietf.org>, Enke Chen <enkechen@cisco.com>
From: Enke Chen <enkechen@cisco.com>
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Date: Mon, 24 Apr 2017 11:02:45 -0700
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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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It appears that you have missed a bunch of discussions in the thread.

The CLI migration falls apart when a customer skips releases and jumps
from one release ("permit all") to another ("deny all").

-- Enke

On 4/24/17 12:36 AM, Mikael Abrahamsson wrote:
> On Sun, 23 Apr 2017, Enke Chen wrote:
> 
>> I don't think that folks are saying this "deny all" doe not make sense. When you start a *new*
>> software, certainly you are free to choose a default based on the most up-to-date knowledge.
> 
> There is no reason a new version of IOS couldn't have changed defaults, but CLI migration can
> fix this to keep the old default by adding a line when software is upgraded from an older
> default-open version.
> 
> If the new versio with default-deny has a command that gives syntax error in the old IOS,
> then this can be added to all neighbor configuring templates and will work identically on
> both the new and old version.
>