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Cisco Bug: CSCvv71132 - [SMF-SVI] Failure in N4 Session Modification Request RPC during Wi-Fi <-> NR Handovers - 2020.02

Last Modified

Oct 09, 2020

Products (1)

  • Cisco Wireless Mobile Application

Known Affected Releases

2020.2 2020.2.0-September 2020.2.4

Description (partial)

PDU Session create failures are seen on Grafana with Reason, PDU_SESSION_DOES_NOT_EXIST.
PDU Session Establishment requests are sent from AMF->SMF with IE Existing PDU Session only during NR->Wi-Fi Handover and these are rejected at SMF.

During NR-> Wi-Fi Handover N4 Session Modification fails and same is not notified to ePDG . In the next Handover, PDU Session Establishment Requests are seen with IE Existing PDU Session during Wi-Fi -> NR Handover which are rejected by SMF with PDU Session Does not Exist.
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