Re: [Gen-art] Gen-ART review of draft-ietf-tsvwg-sctp-strrst-12

Michael Tuexen <> Fri, 02 December 2011 21:25 UTC

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From: Michael Tuexen <>
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Date: Fri, 02 Dec 2011 22:25:38 +0100
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To: "Vijay K. Gurbani" <>
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Subject: Re: [Gen-art] Gen-ART review of draft-ietf-tsvwg-sctp-strrst-12
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On Dec 2, 2011, at 9:36 PM, Vijay K. Gurbani wrote:

> On 12/02/2011 02:11 AM, Michael Tuexen wrote:
>> What about:
>> <t>One important thing to remember about SCTP streams is that they
>> are uni-directional. The endpoint for which a stream is an outgoing
>> stream is called the outgoing side, the endpoint for which the
>> stream is an incoming stream is called the incoming side.
> Michael: I would reword the above as "The endpoint that originates
> the SCTP connection (resulting the the associated stream) is the
> outgoing side and the recipient of that SCTP connection becomes the
> incoming side."
Hi Vijay,

the above is incorrect... It is not important which side establishes
the SCTP association. No matter how it was established, a uni-directional
stream is outgoing for one side, incoming for the other.
After the association has been established, you have n uni-directional
streams from A to B, and m uni-directional streams from B to A.

For the n streams, A is the outgoing side, B the incoming. For the m
streams, B is the outgoing side, A is the incoming side. No matter
if A is client, B is server, vice versa, or both were acting as peers.

Best regards
> The rest of what you write below is fine.
>> The procedures outlined in this section are designed so that the
>> incoming side will always reset their stream sequence number first
>> before the outgoing side which means the re-configuration request
>> must always originate from the outgoing side. These two issues have
>> important ramifications upon how an SCTP endpoint might request that
>> its incoming streams be reset. In effect it must ask the peer to
>> start an outgoing reset procedure and once that request is
>> acknowledged let the peer actually control the reset operation.</t>
> Whether or not to include issue of glare, I will leave up to you.
> Thanks,
> - vijay
> -- 
> Vijay K. Gurbani, Bell Laboratories, Alcatel-Lucent
> 1960 Lucent Lane, Rm. 9C-533, Naperville, Illinois 60566 (USA)
> Email: vkg@{,} /
> Web: