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    Getting Started with Unified In-Service Software Upgrade

    The unified in-service software upgrade (ISSU) feature enables you to upgrade between two different Junos OS releases with no disruption on the control plane and with minimal disruption of traffic.

    To quickly access the information you need, click on the link in Table 1.

    Table 1: Locating the Information You Need to Work With ISSU

    Task You Need to Perform

    Where The Information Is Located

    Verify unified ISSU support for your device

    Unified ISSU System Requirements

    Perform a unified ISSU

    Example: Performing a Unified ISSU

    Verify that the unified ISSU is successful

    Verifying a Unified ISSU

    Understand how the unified ISSU process works

    Understanding the Unified ISSU Process

    Unified ISSU takes advantage of the redundancy provided by dual Routing Engines and works in conjunction with the graceful Routing Engine switchover feature and the nonstop active routing feature.

    Unified ISSU provides the following benefits:

    • Eliminates network downtime during software image upgrades
    • Reduces operating costs, while delivering higher service levels
    • Allows fast implementation of new features

    Modified: 2016-04-28