Lab: Trace PDU session establishment in protocol logs

Multi-Interface Trace Analysis

Reading PDU session traces requires following messages across multiple interfaces simultaneously. NAS on N1 carries the PDU Session Establishment Request and Accept between UE and AMF. NGAP on N2 carries the PDU Session Resource Setup between AMF and gNB. SBI carries the Nsmf and Npcf messages between core NFs. PFCP on N4 carries the session establishment between SMF and UPF. Correlating messages across all four interface types reveals the complete session setup picture from radio to data network.