Subject: Re: [Sigtran] M2PA: Link alignment when proving omitted

From: "Brian F. G. Bidulock" <[email-masked]>
Date: Tue, 10 Jul 2007 05:51:16 -0600

Soni,

Please see answers below...

Soni Goel wrote:                                                      (Fri, 29 Jun 2007 13:25:08)
> Hi Brian,
> 
> I understand your point. LSA should not be resent and timer T2 not
> restarted when M2PA is in Initial Alignment.
> 
> When timer T2 expires, an out-of-service indication sent to MTP3. Now
> the alignment procedure will be restarted at M2PA only when MTP3 retries
> start to M2PA.
> 
> Some more queries as follows -
> 1) Above understanding should be valid for both proving or no proving
> right?

Yes.

> If not, why?
> 
> 2) On similar grounds, M2PA in Out-of-service state, should also not
> send LSOOS in "response to" LSOOS received from peer because this will
> again cause continuous transmission of LSOOS messages. This should again
> be valid for both proving or no proving right? If not why?

Yes.

> 
> 3) M2PA may resend LSA (Not Aligned state, timer T2 running) or LSOOS
> (Out-of-service state) at some implementation dependent periodic
> interval. Right?

Yes.  But it is not expected to do so.

> 
> 4) M2PA in Aligned Ready state should ignore any LSA messages, in case
> of only "no proving". 
> If proving is enabled, it will be done successfully before Ready is sent
> to peer, and if LSA is received now, the link needs to be
> out-of-service. Right?

Yes.

--brian

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

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