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    In-Service Software Upgrade (ISSU) System Requirements

    To perform an in-service software upgrade (ISSU), your device must be running Junos OS Release 13.2X51-D15 or later.

    Note: ISSU does not support extension application packages developed with the Junos SDK.

    Note: The QFX5200 switches do not support ISSU.

    Video 1: How Does ISSU Work on the QFX5100?

    In-Service Software Upgrade (ISSU) Protocol and Process Support

    Table 1 lists the protocols and processes that are supported during an ISSU. Protocols that are not supported might cause packet loss.

    Table 1: ISSU Protocol Support

    Protocol

    Junos OS Release

    Graceful Routing Engine switchover (GRES)

    Junos OS 13.2X51-D15 and later

    Internet Group Management Protocol (IGMP)

    Junos OS 13.2X51-D15 and later

    Layer 2 MAC routes

    Junos OS 13.2X51-D15 and later

    Layer 3 unicast and multicast routes

    Junos OS 13.2X51-D15 and later

    Layer 2 multicast routes

    Junos OS 13.2X51-D15 and later

    Link Aggregation Control Protocol (LACP)

    Note: Configure LACP before you issue an ISSU.

    The LACP periodic fast mode is not supported. Instead, configure the periodic slow mode. If you configure the periodic fast mode, the configuration can be committed without any commit or system log error messages, but you might experience a larger than expected amount of traffic drops. Traffic drops occur because the LACP links go down during an ISSU.

    Link changes are processed after an ISSU is complete.

    Junos OS 13.2X51-D15 and later

    Multicast Listener Discovery (MLD) snooping

    Junos OS 13.2X51-D15 and later

    Nonstop bridging

    Junos OS 13.2X51-D15 and later

    Nonstop active routing

    Junos OS 13.2X51-D15 and later

    Spanning tree protocols:

    • Multiple Spanning Tree Protocol (MSTP)
    • Rapid Spanning Tree Protocol (RSTP)
    • Spanning Tree Protocol (STP)
    • VLAN Spanning Tree Protocol (VSTP)

    Junos OS 13.2X51-D15 and later

    Modified: 2016-04-29