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  • Support for UPF N9 uplink classifier (MX240, MX480, MX960, MX10003, and MX204 Routers)—Starting in Junos OS Release 21.4R1, you can use the uplink classifiers functionality supported by the control and user plane separation (CUPS)-enabled UPF (User Plane Functions) to do the following selectively on the link connected to your devices:
    • Forward uplink traffic towards different protocol data unit (PDU) session anchors.
    • Merge downlink traffic from the different PDU session anchors.
    [See Junos Multi-Access User Plane Overview and CUPS Session Creation and Data Flow with Junos Multi-Access User Plane.]