Error Indication Handling on UPF
UPF, on receiving Error Indication, initiates a PFCP Session Report Request with Error Indication Report that includes remote F-TEID containing TEID and GTP-U Peer address.
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For PGW-U, Error Indication message is sent or received over S5u.
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For SAEGW-U, Error Indication message is sent or received over S1u.
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For SGW-U, Error Indication message is sent and received over S1u and S5u.
UPF generates Error Indication with TEID and GTP-U Peer Address towards a peer when a data packet is received with TEID for which a session or bearer doesn't exist.