Feature Description

UPF supports the GTP-U ingress interface to initiate the user plane service. 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.

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.

Note

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

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.