Port and Sequence Number Selection

The duplicate messages are detected based on the source IP, source address, and sequence number for all UDP-based protocols. Each message from the peer includes a unique combination of these three parameters (source IP, source address, and sequence number).

In this release, only the sequence number changes for each new SMF initiated message. The SMF initiated messages use the same source IP (Virtual IP) and same port (fixed to 8809) number.

The sequence number (PFCP) is a 24-bit value. The 8 MSBs (Most Significant Bit) specify the smf-protocol pod's instance number. The 16 LSBs (Least Significant Bit) are incrementing counters, which generate a unique number for each instance of the smf-protocol POD.

Note
  • The UDP proxy uses the smf-protocol POD instance sequence number to determine the smf-protocol instance to which the response message must be forwarded to.

  • Message retransmission and duplicate detection are not supported in this release.