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:
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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 the interface between SGW-U and PGW-U in the 4G.
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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. |