Re: [Sigtran] single/double exchange mode doubt

"Ankit Kumar Sharma" <ankisharma@gmail.com> Tue, 17 July 2007 06:02 UTC

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Date: Tue, 17 Jul 2007 11:31:59 +0530
From: Ankit Kumar Sharma <ankisharma@gmail.com>
To: bidulock@openss7.org, Ankit Kumar Sharma <ankisharma@gmail.com>, "Asveren, Tolga" <tasveren@sonusnet.com>, sigtran@ietf.org
Subject: Re: [Sigtran] single/double exchange mode doubt
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Brian,

On 7/16/07, Brian F. G. Bidulock <bidulock@openss7.org> wrote:
>
> Ankit,
>
> Ankit Kumar Sharma wrote:                                            (Mon,
> 16 Jul 2007 17:22:21)
> >
> >    Brian,
> >
> >    On 7/16/07, Brian F. G. Bidulock <[1]bidulock@openss7.org> wrote:
> >
> >      Ankit,
> >      Ankit  Kumar  Sharma wrote:                       (Mon, 16 Jul 2007
> >      14:58:17)
> >      >
> >      >    Brian,
> >      >        My  apologies  for  not  making  myself very clear. I have
> >      modified
> >      >    steps  (2)  and  (3)  of  earlier scenario to make myself more
> >      clear below.
> >      >            ----------                       ------------
> >      >            |IPSP 1|----------------------|IPSP A |
> >      >            ----------                       -----------
> >      >    1)  IPSP1  is  serving  AS-1(PC  111)  and  IPSP  A is serving
> >      AS-A(PC 999)
> >      >    with rc=x. They are running happily in single exchange mode.
> >      >    2)  Now,  I  want  to add an additional AS at IPSP1 ex: AS2(PC
> >      222). For
> >      >    AS2,  I  need  to  send  Registration  Request with my routing
> >      key and
> >      >    suppose  peer  side  i.e  IPSP-A  has  returned  rc=y  in
> >      Registration
> >      >    Response message.
> >      >    3)  After  getting  the  Registration  Response  from  IPSP-A,
> >        I fire
> >      >    ASP-Active(rc=y)  from  IPSP-1   towards   IPSP-A.  Now,  what
> >      should be the
> >      >    response from IPSP-A?
> >      ASP-Active-Ack(rc=y).
> >
> >    After  sending ASP Active ack(rc==y), IPSP-A is saying to peer that
> it
> >    could  receive  DATA with rc=y as well(at IPSP-A), but note that
> there
> >    is NO local AS at IPSP-A which could be identified with rc==y.
>
> Yes, there is a local AS at IPSP-A: it is the AS for which IPSP-A sent
> ASP-Active(rc=y)!


Where have I written that ASP-Active is sent by IPSP-A for rc=y?
For rc=y, ASP-Active is sent from IPSP-1 towards IPSP-A(Please see statement
(3) above).

Following diagram gives a much clearer view of this scenario.

      +----+                                               +----+
      |AS-1 |                                             |AS-A |
      |rc=x |                                              |rc=x |
      +----*                                               *----+
            \\                                            //
              \\                                         //
                \\                                      //
                  *------+                   +------+/
                  |IPSP-1+--------------+IPSP-A|
                 /*------+                   +------+
               //
             //
       +----*
       |AS-2 |
       |rc=y |
       +-----+



--brian
>
>
> > Now, if
> >    IPSP-A receives DATA with RC=y, what should it do?
> >    If I am not wrong then by sending ASP-Active-Ack(rc==y) from IPSP-A,
> I
> >    am depicting as if, IPSP-A is working in double exchange mode.
> >    Please look at the following scenario(assume single exchange mode):
> >                ----------                       ------------
> >                |IPSP 1|----------------------|IPSP A |
> >                ----------                       -----------
> >    1)  IPSP-1  wants  to  receive  traffic  for  AS-1 and IPSP-A wants
> to
> >    receive traffic for AS-A.
> >    2)  IPSP-1  sends the routing key of AS-1 through Registration
> request
> >    API, and it receives RC=x from IPSP-A in Registration response.
> >    3)  IPSP-A  sends the routing key of AS-A through Registration
> request
> >    API, and it receives RC=y from IPSP-B in Registration response.
>
> >    4)  Now,  IPSP-1  sends  ASP-Active(rc==x).  How  does  IPSP-A  should
> >    respond?
> >
> >      --brian
> >      --
> >      Brian F. G. Bidulock
> >      [2]bidulock@openss7.org
> >      [3]http://www.openss7.org/
> >
> >    Cheers,
> >    Ankit
> >
> > References
> >
> >    1. mailto:bidulock@openss7.org
> >    2. mailto:bidulock@openss7.org
> >    3. http://www.openss7.org/
>
> --
> Brian F. G. Bidulock
> bidulock@openss7.org
> http://www.openss7.org/
>

Cheers,
Ankit
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