Feature Description

UPF supports GTP-U ingress interfaces to initiate the user plane service. The UPF supports different GTP-U ingress interfaces to allow a separate network for N3 interface and N9, S5u, and S8u interfaces. The N9, S5u, and S8u interfaces share the same public IP.

The supported GTP-U ingress interfaces include:

  • N3: N3 is the interface between gNodeB and UPF.

  • N9: The N9 interface connects two UPFs. It is the interface between intermediate I-UPF and UPF session anchor connecting different PLMN.

  • S5u: S5u is the interface between SGW-U and PGW-U in the 4G.

  • S8u: S8u is an inter-PLMN variant of the S5u interface.

The user plane service associates with the GTP-U service using the associate gtpu-service CLI command in User Plane Service configuration mode. To enable the upf-ingress command, you must configure the require upf command on the UPF. You need the UPF license to enable the require upf command.

Note

UPF does not support multiple GTP-U service selections for a single call.