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.
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:
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N3—N3 is the interface between gNodeB and UPF.
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N9—The N9 interface connects two UPFs. It is the interface between intermediate I-UPF and UPF session anchor connecting different PLMN.
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S5u—S5u is similar to the N9 interface that connects two UPFs. It is the interface between intermediate I-UPF and UPF session anchor.
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S8u—S8u is an inter-PLMN variant of the S5u interface.