Feature Description

UPF supports IP separation per interface to allow separate networks for N3 and N9 interfaces.

With this release, UPF supports different GTP-U ingress interfaces to allow N3, N9, S5u, and S8u interfaces. These interfaces share the same public IP. The associate gtpu-service CLI command in the User Plane Service configuration mode is enhanced to support multiple GTP-U ingress interfaces.

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 PLMNs.

  • 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.