Subject: Re: [Fwd: Re: IPSP proposed text (1st approach)]]

From: Javier Pastor-Balbas <[email-masked]>
Date: Sun, 4 Nov 2001 12:39:14 -0800 (PST)

Brian, 

One quick answer:

As IPSP2 registrates two RKs, it is serving to two ASs and therefore it
gets two RCs... Always 1:1:1.

Cheers // Javier.

--- "Brian F. G. Bidulock" <[email-masked]> wrote:
> Javier,
> 
> But Javier, then we have
> 
>   IPSP1 uses RC1 for traffic from AS1 to AS3.
>   IPSP1 uses RC2 for traffic from AS2 to AS3.
> 
>   IPSP2 uses RC3 for traffic from AS3 to AS1.
>   IPSP2 uses RC4 for traffic from AS3 to AS2.
> 
> This is not what was being described as the RC is associated
> with the AS.  AS3 has two RC values (RC3 and RC4) in that
> case for the same assocation and the same pair of IPSPs.
> I thought you (or others) said that double-ended didn't
> require this?  I though you (or others) said that this is
> what made double-ended "like" the AS/SG case: that one
> RC identified an AS.  But here you have two RCs for AS3.
> If AS3 has similar RKs to 400 other AS, then AS3 will
> require 402 RC values?  Gee, one for each traffic flow?
> 
> This is not double-ended at all.  It just has one set
> of redundant RC values for the reverse direction.  With
> 400 more AS, this would require 804 RC values.
> 
> 
> In the single-ended case we have:
> 
>   IPSP1                       IPSP2
> 
>        REG REQ (RK2, RK1)
>     -------------------------->
>   
>        REG RESP (RC1, RC2)
>     <--------------------------
>   
> And,
> 
>   IPSP1 uses RC1 for traffic from AS1 to AS3;
>   IPSP1 uses RC2 for traffic from AS2 to AS3;
> 
>   IPSP2 uses RC1 for traffic from AS3 to AS1;
>   IPSP2 uses RC2 for traffic from AS3 to AS2;
> 
> Configuration need only be assigned at one end
> instead of both as in the double-ended case.
> There are half the messages, half the RC values
> and there is no case of activations that are
> stuck in half-duplex mode.
> 
> With 400 more AS, this would required only 402 RC
> values.
> 
> 
> Where is the value in the double-ended approach in
> this case?
> 
> --brian
> 
> 
> Javier Pastor-Balbas wrote:                                (Sun, 04
> Nov 2001 12:20:32)
> > Brian, 
> > 
> > IPSP1 won't return the same value for RK3 and RK4 in double-ended.
> It
> > will never happen...
> > 
> > 
> > 
> > IPSP1                       IPSP2
> > 
> >      REG REQ (RK2, RK1)
> >   -------------------------->
> > 
> >      REG RESP (RC1, RC2)
> >   <--------------------------
> > 
> > 
> >      REG REQ (RK3, RK4)
> >   <--------------------------
> >  
> >      REG RESP (RC3, RC4)
> >   -------------------------->
> > 
> > 
> > No violation here... 4AS:4RK:4RC
> > 
> > 
> > Examples of DATA msgs
> > 
> >        DATA (RC4)
> >   -------------------------->
> >        DATA (RC3)
> >   -------------------------->
> >        DATA (RC2)
> >   <--------------------------
> >        DATA (RC1)
> >   <--------------------------
> > 
> > 
> > 
> > 
> > Cheers  // Javier.
> > 
> > 
> > 
> > 
> > --- "Brian F. G. Bidulock" <[email-masked]> wrote:
> > > Javier,
> > > 
> > > > > > >   The routing table at IPSP1 is:
> > > > > > > 
> > > > > > > 	RC3 RK3
> > > > > > > 	RC3 RK4
> > > > > > > 
> > > > > > > Now, there is a problem.  This routing table at IPSP1 is
> > > > > > > not valid: there is the same RC value (index) for two RK
> > > > > > > entries.  How can this happen?  How will IPSP1 know to
> > > > > > > return the same RC value when RK1 and RK2 are registered?
> > > > > > > This would also violate the key relationship that there
> > > > > > > is a 1:1:1 relationship between RC, RK, and AS.
> > > 
> > > How can this happen?
> > > 
> > > --brian
> > > 
> > > -- 
> > > Brian F. G. Bidulock
> > > [email-masked]
> > > http://www.openss7.org/
> > 
> > 
> > __________________________________________________
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> > 
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> -- 
> Brian F. G. Bidulock
> [email-masked]
> http://www.openss7.org/

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