RE: single/double exchange mode doubt

I was wondering whether such a restriction is necessary, i.e. that IPSP
needs to use the same mode for all AS. The state machines are per
IPSP/AS, so I would think that it should be possible to operate them
independently. 

Brian, is there any specific problem scenario you have in mind, if this
is allowed?

   Thanks,
   Tolga
  

> -----Original Message-----
> From: Brian F. G. Bidulock [mailto:[email protected]]
> Sent: Tuesday, July 10, 2007 8:27 AM
> To: Ankit Kumar Sharma
> Cc: [email protected]
> Subject: Re: [Sigtran] single/double exchange mode doubt
> 
> Ankit,
> 
> Ankit Kumar Sharma wrote:
(Thu,
> 05 Jul 2007 15:43:53)
> >
> >    Hi all,
> >    I  have  a  doubt  over  single/double  exchange  mode.  When  we
> say
> >    single/double exchange mode then do we mean:
> >    a)  it  is  a property of ASP. For all ASs served by this ASP, my
> mode
> >    would be either single or double exchange, but not both.
> 
> ASPs do not do single or double exchanges: IPSPs do.
> 
> >    b)  it  is  a  property  of  AS. For one AS, an ASP could behave
as
> in
> >    single exchange and for other it could behave as a double
exchange.
> 
> No.
> 
> >    Please look at the example below:
> >            ----------                       ------------
> >            |ASP 1|----------------------|ASP A |
> >            ----------                       -----------
> >    ASP  1  is serving AS 1 with routing context 1. ASP A is serving
AS
> A,
> >    with  routing  context 1. This configuration is running fine in
> single
> >    exchange mode.
> >    Now,  I want to add one more AS at ASP 1, say AS 2. Routing
context
> of
> >    this  AS  would  be 2 and I want to run it in double exchange
mode.
> Do
> >    someone see any discrepancy in this configuration?
> 
> ASPs do not communicate directly with each other in this fashion:
IPSPs
> do.
> 
> The RFCs state that both IPSPs must operate in the same mode for all
> messages.
> 
> --brian
> 
> 
> --
> Brian F. G. Bidulock
> [email protected]
> http://www.openss7.org/
> 
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