Session Replacement

A Session Replacement (SRIR) is required when peer allocates same GTP-U TEID.

UPF sends SRIR report indicating to delete old session with same TEID. cnSGW-C uses GTPU path failure configuration for SRIR request processing.

Session Replacement

Interface

Configuration

TEID

Action

S1U/S5U

Local Purge

Default

Send SxDeleteSession

Purge locally

Dedicated

Send SxMod (Remove Traffic Endpoint)

Purge Bearer locally

Signal Peer

Default

Send SxMod (Drop)

DBR/DSR

SxDelete

Dedicated

Send DBR/DBC (Async)

SxMod (Remove Traffic Endpoint)

IDFT

NA

NA

Send SxMod (Remove IDFT Traffic Endpoint)- async

Purge Bearer locally