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Cisco Bug: CSCvv90783 - [SMF]:Implementation of Guard timer for ERIR

Last Modified

Oct 13, 2020

Products (1)

  • Cisco Wireless Mobile Application

Known Affected Releases

2020.2

Description (partial)

Symptom:
SGW-U sends error indication only on getting downlink packet after session deletion. So from SMF perspective, no control packet is expected from same SGW after ERIR. But if any packet is received, ERIR shall be considered as false ERIR.
 
New configurable timer to delay ERIR received for 4G sessions ( range 0->3000ms)
Stop timer on receiving  CSR
Stop timer on receiving sm context create for 4g to 5g HO
Stop timer on receiving sm context create for 5g fresh create
Stop timer on receiving MBR  from same SGW. Consider ERIR  as false ERIR.
Stop timer on receiving MBR  from a different SGW.
Stop timer on wifi HO
Stop timer when 4g disconnect procedure is started because of any other trigger
Timer NOT stopped on getting  any pcf initiate update or delete or create. Procedure aborted , if not completed, when timer expiry happens
Stop timer on CBR/UBR/DBR response
Stop timer on MBC/DBC
ERIR received while timer is running is ignored.
Timer not stopped on getting USAR and no changes to  USAR processing 
4G disconnect procedure started on timer expiry. No messages are sent south bound

Conditions:
When false ERIR Comes SMF should not Terminate the session
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