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

Mikael Abrahamsson <swmike@swm.pp.se> Mon, 24 April 2017 07:36 UTC

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Date: Mon, 24 Apr 2017 09:36:13 +0200 (CEST)
From: Mikael Abrahamsson <swmike@swm.pp.se>
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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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.

-- 
Mikael Abrahamsson    email: swmike@swm.pp.se