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Re: [v6ops] Comments on ULA draft

Brian E Carpenter <brian.e.carpenter@gmail.com> Fri, 21 July 2017 04:52 UTC

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To: "Liubing (Leo)" <leo.liubing@huawei.com>, Lorenzo Colitti <lorenzo@google.com>
Cc: "draft-ietf-v6ops-ula-usage-considerations@ietf.org" <draft-ietf-v6ops-ula-usage-considerations@ietf.org>, "v6ops@ietf.org WG" <v6ops@ietf.org>
References: <8AE0F17B87264D4CAC7DE0AA6C406F45C2FB1F0C@nkgeml514-mbx.china.huawei.com>
From: Brian E Carpenter <brian.e.carpenter@gmail.com>
Organization: University of Auckland
Message-ID: <35c02598-2f26-a38a-6c31-75b5c47bd308@gmail.com>
Date: Fri, 21 Jul 2017 16:52:46 +1200
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Subject: Re: [v6ops] Comments on ULA draft
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On 21/07/2017 03:31, Liubing (Leo) wrote:
...
> Btw, the admins could randomly generated a single one 48/ ULA prefix, and announce it internally, there are still 16bit for sub-organization. So, this could be considered as kind of aggregation?.
> 
> Yes, but only for a small network.
> [Bing2] I don’t quite understand why only for small networks? Is it because the 16bit is not enough for a large organization to divide sub-networks?

With 16 routing bits to play with, the admin has basically the equivalent of
an IPv6 Class A (which contains 2**16 /24s). So yes, campus or regional
based aggregation is entirely possible: to exactly the same extent as with
a GUA /48, of course. In fact, in a network running both a GUA and a ULA
prefix, I'd expect the same aggregation plan to be used for both.

   Brian

    Brian

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