Re: sending ASP UP in IPSP SE

As a simplification, can't the role of M3UA client be given to the end that
initiated SCTP association ?
Since SCTP client behaviour in IPSP communication should be configured
anyways, giving the same end
M3UA client fn would be pretty straight. So unless there are compelling
reasons to keep the ASPUP intiator open
for IPSP-SE case, this approach could generate a simpler implementation.


Sunderjeet, Tech Mgr
Aricent Technologies (Holdings) Ltd


On Mon, Nov 15, 2010 at 3:13 PM, Chris Benson <[email protected]> wrote:

> SJ,
>
> The short answer is that it doesn't matter much, and all
> is well if both sides try to come UP around the same time,
> providing that each receiver of an ASP Up responds with
> an ASP Up Ack.
>
> The state of each IPSP is maintained by the remote (not
> local) peer M3UA layer.  When one IPSP wishes to enter
> the UP/Inactive state, it issues a ASP Up message,
> indicating that it is ready for its state to be changed.
> If the receiver of the ASP Up "agrees", then it responds
> with ASP Up Ack.
>
> In the Single Exchange model, this SINGLE positive exchange
> carries the same meaning for the state of both sides.  The
> initiator is saying "I want to move to the UP/Inactive state
> and you can too". The [positive] responder is saying "you are
> now in the UP/Inactive state, and I am too".
>
> So to answer your direct question, if both sides initiate
> ASP Up messages around the same time, all is well, because
> the two meanings coincide (both sides want to be UP/Inactive).
> To be successful, the ASP Up message requires an ASP Up Ack
> message, so both sides respond to an ASP UP message with
> an ASP UP Ack, and both sides move to the UP/Inactive state.
>
> The same argument applies to ASP Active messages etc.
>
> This Single Exchange Model requires that there be one Routing
> Key which fully specifies traffic in both directions.
>
>
>
> Chris Benson, Software Engineer,
> Adax Inc., Berkeley, California, USA.
>    [email protected]
>    +1 510 548-7047 ext. 189
>    www.adax.com
>
> On Mon, 15 Nov 2010, Jaddu, Suresh (NSN - IN/Bangalore) wrote:
>
> >>  Date: Mon, 15 Nov 2010 23:10:01 +0800
> >>  From: "Jaddu, Suresh (NSN - IN/Bangalore)" <[email protected]>
> >>  To:  <[email protected]>
> >>  Subject: [Sigtran] sending ASP UP in IPSP SE
>  >>
> >>
> >>  Hi All,
> >>
> >>  I think this is very old discussion, I have searched through achieves
> >>  but could not find definitive answer. In IPSP single exchange mode how
> >>  to dentine that which side sends the ASP UP message during
> >>  initialization. From the archives and also the RFC it looks like either
> >>  side can initiate the M3UA messaging but in the absence of any
> >>  predefined roles or any prior agreement how to know that which side
> >>  sends the ASP UP.  In such situations it is certainly possible that
> both
> >>  sides may send the ASP UP if that happens how to handle that, is it a
> >>  valid case?? (if this is valid case then what is recommended handling).
> >>
> >>  Thanks,
> >>  SJ.
> >>
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