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High Availability

  • Unified ISSU with enhanced mode supported on MPC11E sub-line cards (MX2010 and MX2020)—Starting in Junos OS Release 21.4R1, MX Series routers with MPC11E sub-line cards installed can use the enhanced mode ISSU option. Enhanced mode eliminates packet loss during the unified ISSU process.

    Use the request system software in-service-upgrade package-name.tgz enhanced-mode command to use unified ISSU with enhanced mode. Use the request system software validate in-service-upgrade package-name.tgz enhanced-mode command to verify that your device and target release are compatible with enhanced mode.

    [See How to Use Unified ISSU with Enhanced Mode and Sub Line Card Overview.]

  • Unified ISSU support on EX4650—Starting in Junos OS Release 21.4R1, EX4650 switches support unified in-service software upgrade (ISSU). The unified ISSU feature enables you to upgrade between two different Junos OS releases with minimal disruption on the control plane and with minimal disruption of traffic.

    Use the request system software in-service-upgrade package-name.tgz command to use unified ISSU. Use the request system software validate in-service-upgrade package-name.tgz command to verify that your device and target release are compatible.

    Note:

    EX4650 switches provide unified ISSU support only if the Cancun versions of the chipset SDK are the same for the current version and the version you are upgrading to. See, High Availability.

    [See Getting Started with Unified In-Service Software Upgrade and Understanding In-Service Software Upgrade (ISSU).]

  • Unified ISSU support on QFX5120-48Y—Starting in Junos OS Release 21.4R1, QFX5120-48Y switches support unified in-service software upgrade (ISSU). The unified ISSU feature enables you to upgrade between two different Junos OS releases with minimal disruption on the control plane and with minimal disruption of traffic.

    Use the request system software in-service-upgrade package-name.tgz command to use unified ISSU. Use the request system software validate in-service-upgrade package-name.tgz command to verify that your device and target release are compatible.

    Note:

    QFX5120-48Y switches provide unified ISSU support only if the Cancun versions of the chipset SDK are the same for the current version and the version you are upgrading to. See, High Availability.

    [See Getting Started with Unified In-Service Software Upgrade and Understanding In-Service Software Upgrade (ISSU).]