Re: [trill] I-D Action: draft-ietf-trill-rbridge-multilevel-04.txt

Donald Eastlake <d3e3e3@gmail.com> Sun, 28 August 2016 14:19 UTC

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From: Donald Eastlake <d3e3e3@gmail.com>
Date: Sun, 28 Aug 2016 10:18:45 -0400
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Subject: Re: [trill] I-D Action: draft-ietf-trill-rbridge-multilevel-04.txt
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This revision just has some minor changes related to updating references to
other drafts.

Thanks,
Donald
===============================
 Donald E. Eastlake 3rd   +1-508-333-2270 (cell)
 155 Beaver Street, Milford, MA 01757 USA
 d3e3e3@gmail.com

On Sun, Aug 28, 2016 at 10:17 AM, <internet-drafts@ietf.org> wrote:

>
> A New Internet-Draft is available from the on-line Internet-Drafts
> directories.
> This draft is a work item of the Transparent Interconnection of Lots of
> Links of the IETF.
>
>         Title           : Alternatives for Multilevel TRILL (Transparent
> Interconnection of Lots of Links)
>         Authors         : Radia Perlman
>                           Donald Eastlake
>                           Mingui Zhang
>                           Anoop Ghanwani
>                           Hongjun Zhai
>         Filename        : draft-ietf-trill-rbridge-multilevel-04.txt
>         Pages           : 31
>         Date            : 2016-08-28
>
> Abstract:
>    Extending TRILL to multiple levels has challenges that are not
>    addressed by the already-existing capability of IS-IS to have
>    multiple levels.  One issue is with the handling of multi-destination
>    packet distribution trees. Another issue is with TRILL switch
>    nicknames.  There have been two proposed approaches.  One approach,
>    which we refer to as the "unique nickname" approach, gives unique
>    nicknames to all the TRILL switches in the multilevel campus, either
>    by having the Level-1/Level-2 border TRILL switches advertise which
>    nicknames are not available for assignment in the area, or by
>    partitioning the 16-bit nickname into an "area" field and a "nickname
>    inside the area" field.  The other approach, which we refer to as the
>    "aggregated nickname" approach, involves hiding the nicknames within
>    areas, allowing nicknames to be reused in different areas, by having
>    the border TRILL switches rewrite the nickname fields when entering
>    or leaving an area. Each of those approaches has advantages and
>    disadvantages.
>
>    This informational document suggests allowing a choice of approach in
>    each area. This allows the simplicity of the unique nickname approach
>    in installations in which there is no danger of running out of
>    nicknames and allows the complexity of hiding the nicknames in an
>    area to be phased into larger installations on a per-area basis.
>
>
>
>
> The IETF datatracker status page for this draft is:
> https://datatracker.ietf.org/doc/draft-ietf-trill-rbridge-multilevel/
>
> There's also a htmlized version available at:
> https://tools.ietf.org/html/draft-ietf-trill-rbridge-multilevel-04
>
> A diff from the previous version is available at:
> https://www.ietf.org/rfcdiff?url2=draft-ietf-trill-rbridge-multilevel-04
>
>
> Please note that it may take a couple of minutes from the time of
> submission
> until the htmlized version and diff are available at tools.ietf.org.
>
> Internet-Drafts are also available by anonymous FTP at:
> ftp://ftp.ietf.org/internet-drafts/
>
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