Re: [Sigtran] single/double exchange mode doubt

"Brian F. G. Bidulock" <bidulock@openss7.org> Tue, 17 July 2007 10:48 UTC

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Date: Tue, 17 Jul 2007 04:48:12 -0600
From: "Brian F. G. Bidulock" <bidulock@openss7.org>
To: Ankit Kumar Sharma <ankisharma@gmail.com>
Subject: Re: [Sigtran] single/double exchange mode doubt
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In-Reply-To: <6dbbbf160707170340s5905b128o91b7816d6b24b590@mail.gmail.com>; from ankisharma@gmail.com on Tue, Jul 17, 2007 at 04:10:19PM +0530
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Ankit,

Ankit Kumar Sharma wrote:                                            (Tue, 17 Jul 2007 16:10:19)
>      In SE mode an AS exists at both ends of the association or
>      not at all.  rc=x is valid in you diagram by rc=y is not.
>      If an AS with rc=y does not exist at IPSP-A, then it will
>      not be sending ASP-Active(rc=y) to IPSP-1.
>      Put an AS-B(rc=y) at IPSP-A and your problems vanish.
> 
>    I  know this, please check one of my previous responses. I have copied
>    that below for your convenience:
>    "  Corresponding  to  rc=y,  I need to send ASP-Active towards IPSP-A.
>    Since  there  is no local AS with rc=y at IPSP-A, it would return with
>    error  code  "invalid RC", unless there is some way to instruct IPSP-A
>    to  behave as a double-exchange IPSP for rc=y. Although I could do the
>    workaround  by adding a dummy AS with rc=y at IPSP-A but that solution
>    is irrational and not so clean. "

This is _not_ a workaround.  An AS for rc=y at IPSP-A makes a much sense as
an AS for rc=x.  There is nothing irrational or unclean about it.

>    Whole point of this discussion is, why exchange mode(Double/Single) is
>    a property of IPSP, but not AS?

Because it is simply not necessary.

--brian

-- 
Brian F. G. Bidulock
bidulock@openss7.org
http://www.openss7.org/

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