Re: [Dime] Call for WG adoption: draft-jones-diameter-group-signaling-01

Tina,

On Apr 5, 2012, at 2:41 AM, Tina TSOU wrote:

> Hi Jouni and Mark,
> The problem statement is valid and the solution can work in basic scenarios. 
> 
> However the solution may have some limit in roaming scenario.
> 
> Consider a network having a WLAN AN (hosting a Diameter Client) requesting some 3G internet resources, visited network proxies and home network server as below:
> 
> Client -------------- <Visited n/w proxy 1> ---------- {Home network server}
>         -------------- <Visited n/w proxy 2> ----------{Home network server}
> 
> The session path can be established through either of the visited n/w proxies. For all the messages of same session, client can ensure that the session path through stateful nodes is maintained. The visited n/w proxies would require that the session path be maintained for offline charging etc.
> In this scenario, if client uses group signalling method to terminate all sessions in a group using GSTR, only the proxy in the GSTR-GSTA path will be aware of session termination. Since there are no follow-up messages, there is no mechanism to let the other proxy know that the sessions are terminated.

How this differentiates from a generic issue where someone
puts a proxy on path that is supposed to stay on path and
at the same time allows by deployment options an alternative
path to take place? Like asking for trouble..

> This problem can be avoided in Server initiated group signalling cases (GRAR & GASR) as the PER_SESSION mode can be used for follow up exchanges.
> Thus the current solution has a limit if client uses group signalling method for session termination in roaming cases.

The problem could also be avoided by not doing such deployment
where this can happen.

- Jouni

> 
> I volunteer to work together with Mark to find a solution for this case.
> 
> I'm NOT aware of any IPR in this area.
> 
> 
> Tina
> 
> 
>> -----Original Message-----
>> From: dime-bounces@ietf.org [mailto:dime-bounces@ietf.org] On Behalf Of
>> jouni korhonen
>> Sent: Sunday, April 01, 2012 12:20 PM
>> To: dime@ietf.org
>> Cc: dime-chairs@tools.ietf.org
>> Subject: [Dime] Call for WG adoption: draft-jones-diameter-group-
>> signaling-01
>> 
>> 
>> Folks,
>> 
>> During the Dime WG meeting in Paris we decided to adopt draft-jones-
>> diameter-group-signaling-01
>> "Diameter Group Signaling" as a working group I-D. The I-D is an input for
>> the charter mile stone 'Protocol extension for bulk and group signaling'.
>> 
>> This mail starts a one week verification for the adoption. If you have
>> strong concerns that the
>> draft-jones-diameter-group-signaling-01 is not appropriate as a _basis_
>> for the solution, then express your concerns on the mailing list by 8th
>> April.
>> 
>> - Jouni & Lionel
>> 
>> 
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