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Re: draft-bourbaki-6man-classless-ipv6-00

Peter Hessler <phessler@theapt.org> Sun, 04 June 2017 13:16 UTC

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Date: Sun, 04 Jun 2017 15:16:19 +0200
From: Peter Hessler <phessler@theapt.org>
To: ipv6@ietf.org
Subject: Re: draft-bourbaki-6man-classless-ipv6-00
Message-ID: <20170604131619.GJ30896@gir.theapt.org>
References: <20170602141259.GD30896@gir.theapt.org> <CAKD1Yr0DtQYvCYLQexhXe_nhb5rjeyhnB4bCveqyO5Xbuwdg1A@mail.gmail.com> <20170602145655.msfjw35qhoev4sm2@Vurt.local> <CAKD1Yr3gqFgq3dxFaBEV++q5cgx1AHzFLGRJ50DYJjVE69C7iA@mail.gmail.com> <f2260ee557014429a1fef32de040547b@XCH15-06-11.nw.nos.boeing.com> <d62ce5e3ea0f486eb4c9d54609a86b24@XCH15-06-08.nw.nos.boeing.com> <04bdfdfe018145e6aedbaa62ed6cbfb0@XCH15-06-11.nw.nos.boeing.com> <78fe298cb5484d50a56cf6ed4ddafb54@XCH15-06-08.nw.nos.boeing.com> <6bba4c2b58964787860f2c7acf130959@XCH15-06-11.nw.nos.boeing.com> <f3ea6bf2d52b4179b1d9268dbcf67771@XCH15-06-08.nw.nos.boeing.com>
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On 2017 Jun 02 (Fri) at 20:14:11 +0000 (+0000), Templin, Fred L wrote:
:Another question that we would have to ask is what is the longest prefix that
:we should expect an ISP (or a core Internet router, for that matter) to carry
:in its routing tables? A /80? A /96?

OpenBGPD is intended for use on the default-free-zone, and has a default
configuration that allows /16 - /48 for IPv6 prefixes.  In looking at RIR
policies, and recommendations from vendors and operational documents, /48
looks to be the longest prefix length that you can consider reliably
routable beyond your own AS.

*Inside* an AS however, I see no reason to artificially limit the prefix
size.  Operators should aggregrate where it makes sense
(region/metro/building/cage/row/rack/etc), but that is good design
regardless of the size or even IP version.


-- 
First Law of Socio-Genetics:
	Celibacy is not hereditary.

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