Recommended Configurations

Following are the recommended configurations and restrictions related to N4/Sx and SRP over IPSec:

  • The multihop BFD timer between SMF and UPF must be seven seconds (for Data UPFs).

  • The singlehop BFD must be enabled on all the contexts (SMF GW/Billing and UPF Gn/Gi).

  • Inter-chassis multihop BFD must be enabled for SMF-SMF ICSR and UPF-UPF ICSR (IMS UPF).

  • The SRP-IPSec ACL must be configured for TCP protocol instead of IP protocol.

  • The N4/Sx-IPSec ACL must be configured for UDP protocol instead of IP protocol.