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Re: [trill] review of Trill over UDP/IP

Donald Eastlake <d3e3e3@gmail.com> Tue, 15 July 2014 07:52 UTC

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From: Donald Eastlake <d3e3e3@gmail.com>
Date: Tue, 15 Jul 2014 03:52:16 -0400
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To: Zongning <zongning@huawei.com>
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Subject: Re: [trill] review of Trill over UDP/IP
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Hi,

On Mon, Jul 14, 2014 at 8:40 PM, Zongning <zongning@huawei.com> wrote:
> Hi, folks,
>
> (Re-send after subscription, sorry for potentially duplicated message…)
>
> I’ve briefly reviewed the draft mainly from transport consideration’s
> perspective, and have a question on congestion control.
>
> It says “When a TRILL over IP flow carries primarily IP-based traffic, the
> aggregate traffic is assumed to be TCP friendly… and no additional
> congestion avoidance action is necessary”. I’d like to see more discussion
> about whether the adoption of UDP encapsulation by RBridges between the
> end-hosts will negate such conclusion? Another word, even if the end-hosts
> use TCP for congestion control, should there be some congestion
> consideration between the RBridges that talk UDP?

Congestion control has been a very active area of discussion for other
drafts. The congestion control text in the current version of
draft-ietf-trill-over-ip was just copied with minor edits from an
earlier version of draft-ietf-mpls-in-udp. That mpls draft has since
been updated with substantial changes to its congestion section so I'm
sure some work will be needed here.

> Plus, I’d know the reason why choosing UDP? I cannot find any in the draft –
> but I am sure there are reasons discussed in the group. :-)

This was discussed at IETF 89 and the consensus there was confirmed on
the mailing list. See
http://www.ietf.org/mail-archive/web/trill/current/msg06206.html
You could look at the minutes at
http://www.ietf.org/proceedings/89/minutes/minutes-89-trill or listen
to the audio recording.

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

> Sorry if I misunderstood any point, and thanks for your clarification in
> advance!
>
> -Ning
>
>
>
>
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