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Cisco Bug: CSCvi58213 - PGW - Gy - After Final Interrogation we see that PGW doesn apply validity time expires

Last Modified

Jun 12, 2018

Products (2)

  • Cisco ASR 5000 Series
  • Cisco ASR 5500

Known Affected Releases

21.2.6

Description (partial)

Symptom:
Currently StarOs doesn't support this mechanism: 

RFC 4006 specifies that Validity timer should be applied and respected after Final Interrogation is finished. 

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5.6.  Graceful Service Termination

When "Final Interrogation End's" and "Action and Restrictions Start" we expect that subscriber is redirected and with validity timer we periodically check if subscriber replenished account.
https://tools.ietf.org/html/rfc4006#appendix-A

5.6.2.  Redirect Action
When the final granted units have been consumed, the credit-control
client MUST perform an intermediate interrogation. The purpose of
this interrogation is to indicate to the credit-control server that
the specified action started and to report the used units. The
credit-control server MUST deduct the used amount from the end user's
account but MUST NOT make a new credit reservation. The creditcontrol
client, however, may send intermediate interrogations before
all the final granted units have been consumed for which rating and
money reservation may be needed; for instance, upon Validity-Time
expires or upon mid-session service events that affect the rating of
the current service. Therefore, the credit-control client MUST NOT
include any rating related AVP in the request sent once all the final
granted units have been consumed as an indication to the server that
the requested final unit action started, rating and money reservation
are not required (when the Multiple-Services-Credit-Control AVP is
used, the Service-Identifier or Rating-Group AVPs is included to
indicate the concerned services). 


Naturally, the Credit-Control-
Answer message does not contain any granted service unit and MUST
include the Validity-Time AVP to indicate to the credit-control
client how long the subscriber is allowed to use network resources
before a new intermediate interrogation is sent to the server.

Conditions:
Current behavior

Validity-timer will get started only when session has valid Quota/redirected-behavior.

If validity-time is received with 4012 result-code without GSU or FUI (with redirect) information PGW doesn't apply Validity-timer.
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