How it Works
The functionality of the Multiple N4/Sx Interfaces feature involves:
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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.
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There is no slicing of configuration in UPF per individual SMF.
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A maximum number of four SMF peers are connected to a single UPF.
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Overlapping IP pools from multiple SMFs are segregated based on the VRF ID.
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Individual N4 association release purges sessions of the impacted SMF peer.
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UPF redundancy works seamlessly.
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During any conflict with different SMF configurations, it will be installed in the sequence of configured CLIs and not resolved at UPF.