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High Availability

  • Unified ISSU support (QFX5220-32CD)—Starting in Junos OS Evolved Release 22.1R1, you can use unified in-service software upgrade (unified ISSU) to upgrade between two different Junos OS Evolved releases with minimal disruption on the control plane and with minimal disruption of traffic.

    Use the request system software add package-name.tgz restart command to use unified ISSU. Use the request system software validate-restart package-name.tgz command to verify that your device is ready for unified ISSU.

    [See request system software add restart and request system software validate-restart.]

  • Support for runtime fabric OAM (PTX10004, PTX10008, and PTX10016)—Starting in Junos OS Evolved Release 22.1R1, the runtime fabric Operation, Administration, and Maintenance (OAM) periodically checks fabric connectivity and helps detect and report failures in fabric planes during system runtime.

    [See Error Handling by Fabric OAM.]