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Performing an In-Service Software Upgrade (ISSU) with Non-Stop Routing

 

You can use an in-service software upgrade with non-stop routing to upgrade the software running on the switch with minimal traffic disruption during the upgrade.

Note

Starting with Junos OS Release 18.2R1 on the QFX5200 switch, we recommend that you wait at least five minutes between in-service software upgrades.

Note

Starting with Junos OS Release 17.1R1, on QFX5100 and EX4600 switches, you cannot perform an ISSU from a Junos OS Release earlier than 17.1R1 to Junos OS Release 17.1R1.

This topic covers:

Preparing the Switch for Software Installation

Before you begin software installation using ISSU:

Note

Before you perform an in-service software upgrade, if applicable, remove the set system internet-options no-tcp-reset drop-all-tcp command from the configuration, otherwise the upgrade will fail and an error message will be displayed.

NSB and non-stop routing enable NSB-supported Layer 2 protocols to synchronize protocol information between the master and backup Routing Engines.

Upgrading the Software Using ISSU

This procedure describes how to upgrade the software running on a standalone switch:

Note

If the Host OS software needs to be updated, you cannot perform an ISSU. Instead, perform a standard software upgrade.

To upgrade the switch using ISSU:

  1. Download the software package by following the procedure in the Downloading Software Files with a Browser section in Installing Software Packages on QFX Series Devices.

  2. Copy the software package or packages to the switch. We recommend that you copy the file to the /var/tmp directory.

  3. Log in to the console connection. Using a console connection allows you to monitor the progress of the upgrade.

  4. Start the ISSU:

    • On the switch, enter:

      where package-name.tgz is, for example, jinstall-host-qfx-5e-18.1R1-secured-signed.tgz.

    Note

    During the upgrade, you will not be able to access the Junos OS CLI.

    The switch displays status messages similar to the following messages as the upgrade executes:

    Note

    If the ISSU process stops, you can look at the CLI output when you issue the request system software in-service-upgrade command to diagnose the problem. You can also look at syslog files for more information.

  5. Log in after the reboot of the switch completes. To verify that the software has been upgraded, enter the following command:

Release History Table
Release
Description
Starting with Junos OS Release 18.2R1 on the QFX5200 switch, we recommend that you wait at least five minutes between in-service software upgrades.
Starting with Junos OS Release 17.1R1, on QFX5100 and EX4600 switches, you cannot perform an ISSU from a Junos OS Release earlier than 17.1R1 to Junos OS Release 17.1R1.