Feature Description

The UPF supports different GTP-U ingress interfaces to allow N3, N9, S5u, and S8u interfaces.

The associate gtpu-service CLI command in the User Plane Service configuration mode is enhanced to support different GTP-U ingress 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 similar to the N9 interface that connects two UPFs. It is the interface between intermediate I-UPF and UPF session anchor.

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

For more information, refer to the UPF Ingress Interfaces chapter.