How it Works

The functionality of the Multiple N4/Sx Interfaces feature involves:

  • The ECS/ACS configuration at UPF is a union of all individual control plane specific configurations.

    For example:

    SMF1 has rulebase RB1 and no RB2

    SMF2 has rulebase RB2 and no RB1

    The UPF has both rulebase, RB1 and RB2 to cater the sessions from RB1 and RB2.

  • There is no slicing of configuration in UPF per individual SMF.

  • A maximum number of four SMF peers are connected to a single UPF.

  • Overlapping IP pools from multiple SMFs are segregated based on the VRF ID.

  • Individual N4 association release purges sessions of the impacted SMF peer.

  • UPF redundancy works seamlessly.

  • During any conflict with different SMF configurations, it will be installed in the sequence of configured CLIs and not resolved at UPF.