System Architecture

cnSGW-C and SMF/IWF uses the same UPF instance, so that UPF can use those sessions to the collapsed data path.
Control plane (cnSGW-C and SMF) selects the same User-plane in various scenarios (initial attach, handover, and so on).
Following actions takes place during Initial Attach:
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cnSGW-C passes the SGW-U FQDN information of selected UPF instance to SMF in Initial attach.
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SMF selects the UPF instance as per the received SGW-U FQDN.
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Same UPF FQDN is configured at cnSGW-C and at SMF to create a correlation as part of the network element profile.