RE: SG view of the ASP

Brian,

This is how it is affecting my expected behavior.

Note: Currently I have only one ASP but in future I intend to add a
standby ASP. Hence I use the trafficmode=override in the messages. Also
the desired behavior is that the ASP to laodshare the traffic going to
the SG among the two SGPs.

The problem showed up during the following scenario:

The ASP comes up, establishes associations and sends ASP UP message
(ASPIdentifier = 10007) to both SGPs for which the SGPs respond with ASP
UP ACK. 

The ASP sends ASP ACTIVE (trafficmode=override) with a routing context
for the AS to the SGP1 and the SGP1 responds with ASP ACTIVE ACK. The
status on the SG shows that the AS is active on SGP1 and inactive on
SGP2.

Later the ASP sends ASP ACTIVE (trafficmode=override) with the same
routing context to the SGP2 and the SGP2 responds with ASP ACTIVE ACK.
The status on the SG shows that the AS is active on SGP2 and inactive on
SGP1. I was expecting the AS to be active on both SGPs since the ASP had
sent ASP ACTIVE to both SGPs.  This was not what I was expecting.

The explanation given by the Third party SG team is that since they
treat association from SGP1 to ASP as one ASP (ASP1) and the association
from SGP2 to ASP as a separate ASP (ASP2), they are over writing the
status when the SGP2 received the ASP ACTIVE message from the ASP. They
suggest that I put the trafficmode=loadshare and that would solve the
problem.  So I am really confused.

Hope this helps.

Thanks,
Krishna



-----Original Message-----
From: Brian F. G. Bidulock [mailto:[email protected]] 
Sent: Thursday, February 09, 2006 11:15 AM
To: Munnaluru, Krishna
Cc: [email protected]
Subject: Re: [Sigtran] SG view of the ASP

Krishna,

How is the behaviour different?

--brian

Munnaluru, Krishna wrote:                       (Thu, 09 Feb 2006
10:23:19)
> 
>    Hi,
> 
> 
>    I  am implementing ASP and we are trying to interop with a third
party
>    SG. The following is the scenario.
> 
> 
>    We  have  one  ASP  and  one  SG  containing  two  SGPs.  The  ASP
is
>    establishing  one  SCTP  association  with  each  SGP  (a total of
two
>    associations).
> 
> 
>    The problem is that the SG is treating each association as a
different
>    ASP.  So it thinks that there are two separate ASPs in the network.
Is
>    this  the  correct  behavior?  My  understanding is that the SG
should
>    treat  it  as  "two associations to the same ASP (from each SGPs)"
and
>    NOT "as two separate ASPs".
> 
> 
>    Could someone please comment on this behavior?
> 
> 
>    Thanks in advance,
> 
>    Krishna

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-- 
Brian F. G. Bidulock
[email protected]
http://www.openss7.org/