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Diameter Group Signaling

Diameter Group Signaling. Thursday, March 28, 2012 draft-jones-diameter-group-signaling-01 Mark Jones IETF 83 Paris, France. Motivations. Reduce signaling in those use cases that require many Diameter sessions to be modified or terminated at the same time.

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Diameter Group Signaling

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  1. Diameter Group Signaling Thursday, March 28, 2012 draft-jones-diameter-group-signaling-01 Mark Jones IETF 83 Paris, France

  2. Motivations • Reduce signaling in those use cases that require many Diameter sessions to be modified or terminated at the same time. • Add group signaling to existing Diameter applications with minimal impact and ambiguity. • Describe the problem space in an application neutral fashion (best practices?) to aid other SDOs in tackling this problem.

  3. Two Problem Aspects • Managing group assignments. • How to add or remove sessions from groups. • Guidelines for modifying group assignments. • Permission model (or not) • Manipulating groups of sessions • Defines new group command equivalents for RAR/RAA, ASR/ASA and STR/STA. • Defines the session state machine for these new commands.

  4. Managing Group Assignments • In the current version of the draft: • Either Diameter peer may assign a session to a group. • Mid-session modification of group assignments are allowed. • A Diameter peer may remove the group(s) assigned to the active session by its peer. • However, Diameter applications may impose a stricter model or forbid some functions.

  5. Manipulating Groups of Sessions • Current version of the draft proposes defining new group command equivalents for the group actions. • Only RFC3588 equivalents defined so far. • No intent to define NASREQ/DCCA equivs. • Alternative approaches have been proposed: • Use existing commands • Bulk command container • New group command flag

  6. New Group Commands • New Diameter application is mandatory. • New group commands do not have the same ABNF as non-group commands. • Session-Id is not present. • Other AVPs may be absent/present depending on application-specific restrictions. • CER/CEA takes care of backwards compatibility. • Peers can negotiate down to non-group mode.

  7. Existing Commands • New Diameter application is mandatory. • Group commands have same ABNF as non-group commands but a different Diameter application id. • Session-Id is a required AVP so it is either: • re-purposed to contain a group identifier, OR • ignored, new ‘optional’ AVP contains group identifier.

  8. Bulk Command Container • New Diameter application is mandatory. • Single new command is defined, serving as container for all group commands. • Actual group command code added as AVP • Bulk command container contains a group identifier and * [ AVP ]. • Presence of further AVPs depends on which group action is being performed.

  9. New Group Command Flag • New Diameter application is mandatory. • New Group flag is introduced in the command flags field. • Group commands have same ABNF as non-group commands but a different Diameter application id. • (Ed: It is unclear to me what the advantages are over simply reusing existing commands ABNF.)

  10. Next Steps • Complete guidelines for managing group assignments. • Pick ONE method for Manipulating Groups for Sessions. • All methods could work. • Don’t want a long drawn out beauty contest. • Question for DIME WG: • Adopt this draft as a basis for addressing the new group signaling charter item?

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