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Flow-based and Packet-based Processing

  • Service Offload (SOF) Out Of Order (OOO) Detection for TCP Traffic (SRX4600, SRX5400, SRX5600, and SRX5800)—Starting in Junos OS Release 23.2R1, we support out- of-order packet (OOO) detection for TCP connections in midstream traffic during service offload (SOF) switchover.

    The OOO packet detection allows you to configure a TCP sequence threshold value for accepting OOO packets to allow SOF switchover. As long as the calculated OOO packet numbers are lower than the configured threshold, SOF takes effect immediately. If the calculated OOO packet numbers are greater than the configured threshold value, the packets are still forwarded to the SPU for processing. By default, the OOO detection feature is disabled. To enable the feature, use the tcp-session-install-interval and tcp-seq-ooo-window commands in the [edit security forwarding-options services-offload] hierarchy. The tcp-seq-ooo-window command is mandatory in the configuration.

    [See TCP Sessions.]