Re: [Dime] group signaling - limited success on group operations

["Bales, Mark [CTO]" <[e-mail]>]

Marco

IMO

Diameter peers need to fall back to single-session operation for failed session(s).  ---- keep as much efficiency as possible.
Remove sessions that failed from the session Group. --- we need to keep the session groups as accurate as possible.

Determining of re-addition of a Session to a Session Group would need to happen at some point but I see the as a recovery operations but an administrative function.



From: DiME [mailto:[e-mail]] On Behalf Of Marco Liebsch
Sent: Thursday, February 23, 2017 10:37 AM
To: [e-mail]
Subject: [Dime] group signaling - limited success on group operations

There is an open item in the draft about how Diameter peers treat sessions, which belong to one or
multiple session groups, and a group command failed for some sessions associated with the session
groups to which the command applies. This is the current text in the draft:


When a Diameter node receives a request to process a command for one
or more session groups and the result of processing the command
succeeds for some sessions identified in one or multiple session
groups, but fails for one or more sessions, the Result-Code AVP in
the response message SHOULD indicate DIAMETER_LIMITED_SUCCESS as per
Section 7.1.2 of [RFC6733].  In case of limited success, the
sessions, for which the processing of the group command failed, MUST
be identified using a Failed-AVP AVP as per Session 7.5 of [RFC6733].




Some more description is needed how these sessions, for which the group operation
failed, should be treated. Here is a proposal:

- Diameter peers need to fall back to single-session operation for these sessions
- Diameter node SHOULD re-try the command on a single-session basis
- If the single-session command succeeds, the Diameter peers MAY continue keeping the
session(s) in the session group(s)
- if the single-session command fails, the session MUST be removed from all session groups
to which the previous group command applied

This is kind of optimistic procedure.

Alternative: We may also mandate to fall back to single session operation and remove failed
sessions from all session groups to which the group command applied.

Please let me know your position w.r.t. the above operation, text and options.

marco








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