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

[Michael Tuexen <[e-mail]>]

On Nov 30, 2011, at 10:10 PM, Vijay K. Gurbani wrote:

> On 11/30/2011 02:19 PM, Michael Tuexen wrote:
>>> - S5, second paragraph --- "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."
>> A stream is unidirectional. So it is outgoing for one side, incoming
>> for the other. The outgoing side has to request the reset, the incoming
>> side will perform it and acknowledge that the reset has been performed and
>> then the outgoing side will also do the reset.
> 
> OK, so let's see ... assume two hosts A and B with two unidrectional
> streams open between them:
> 
> 
>    --------- a' -------->
> A                         B
>    <-------- b' ---------
> 
> a' is outgoing stream for A and incoming stream for B.
> b' is outgoing stream for B and incoming stream for A.
Correct.
> 
> What you are saying is that either A has to request a reset on a'
> or B has to request a reset on b'.  In the worst possible case,
Correct.
> both A and B can request a reset on their respective streams
> (A on a' and B on b') without leading to deadlock or a violation
> of the protocol.  Yes?
Correct.
> 
> If so, then this discussion at least makes it clear to me.  However,
> I will leave it to you on whether or not to clarify this further
> in the draft.  When I read the draft initially, I certainly had
> enough doubts that resulted in this email exchange.
I understand. When rereading the sentence because of your mail,
I also think it is suboptimal, but could not come up with an improved
version right now. Let me see if I can improve it...

Best regards
Michael
> 
> Thanks,
> 
> - vijay
> -- 
> Vijay K. Gurbani, Bell Laboratories, Alcatel-Lucent
> 1960 Lucent Lane, Rm. 9C-533, Naperville, Illinois 60566 (USA)
> Email: vkg@{bell-labs.com,acm.org} / [e-mail]
> Web:   http://ect.bell-labs.com/who/vkg/
>