Recommended Configurations
Following are the recommended configurations and restrictions related to N4/Sx and SRP over IPSec:
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The multihop BFD timer between SMF and UPF must be seven seconds (for Data UPFs).
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The singlehop BFD must be enabled on all the contexts (SMF GW/Billing and UPF Gn/Gi).
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Inter-chassis multihop BFD must be enabled for SMF-SMF ICSR and UPF-UPF ICSR (IMS UPF).
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The SRP-IPSec ACL must be configured for TCP protocol instead of IP protocol.
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The N4/Sx-IPSec ACL must be configured for UDP protocol instead of IP protocol.