How it Works
The functionality of the Multiple N4 Interface feature involves:
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Single UPF has multiple N4/Sx interface associations with each SMF.
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There is no slicing of configuration in UPF per individual SMF.
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The ECS/ACS configuration at the UPF is a union of all the individual SMF-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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A maximum 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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In rare instance of any conflict among different SMF configurations, it will not be resolved at the UPF and will be installed in the sequence in which such CLIs were configured.