Re: Behaviour in DE-IPSP model when ASPAC does not haveany RC.
Anand N Ilkal <[email protected]>
| Newsgroups | gmane.ietf.sigtran |
|---|---|
| Message-ID | <[email protected]> |
Hello Brian,
could you please provide your thoughts on the scenario earlier explained?
re-produced just for clarification...
My doubt is if the following scenario is correct in Double Exchange mode-
IPSP
A
IPSP B
LAS1 RC=100
RAS1 RC=300
----------
LASP1
------------ RASP1
LAS2 RC=200
---------- LASP1
INIT
--------------------------------------------------------------->
<---------------------------------------------------------------- INIT_ACK
COOKIE_ECHO
-------------------------------------------------------------->
<---------------------------------------------------------------- COOKIE_ACK
<---------------------------------------------------------------- ASPUP
ASPUP_ACK
--------------------------------------------------------------->
<---------------------------------------------------------------- ASPAC
(without RC)
ASPAC_ACK
---------------------------------------------------------------->
*IPSP A marks LAS1, LAS2, RAS1, LASP1 and RASP1 as ACTIVE in its stack after
receiving ASPAC without any RC, similarly after receiving ASPAC_ACK IPSP B
will mark LAS1, LAS2, RAS1, LASP1 and RASP1 as ACTIVE in its stack*. *And
Hence there is no need for sending ASPAC from IPSP A*.
On 25 March 2010 16:01, Brian F. G. Bidulock <[email protected]> wrote:
> Jaddu,,
>
> Jaddu, Suresh (NSN - IN/Bangalore) wrote: (Thu, 25 Mar 2010 12:15:39)
> >
> > Can we also interpret your bellow statement like this --> In IPSP
> > double exchange mode ASPACT from both sides MUST include the Routing
> > context of its local AS.
>
> No. There is no such statement in the RFC.
>
> > If that is correct then why in the RFC section 5.6.2 its mentioned
> > that Routing Context is optional in ASPAC message.
>
> It is not really optional. That is, there are degrees of optional.
>
> 4.3.4.3 says...
>
> ... In the case where an ASP wishes to
> process the traffic for more than one Application Server across a
> common SCTP association, the ASP Active message(s) SHOULD contain a
> list of one or more Routing Contexts to indicate for which
> Application Servers the ASP Active message applies. ...
>
> Thus, including RC in ASPAC is not completely optional.
>
> --brian
>
> --
> Brian F. G. Bidulock
> [email protected]
> http://www.openss7.org/
>
--
with regards,
Anand kumar Ilkal
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