Understanding Junos OS Upgrades for SRX Series Devices

 

SRX Series devices are delivered with Junos OS preinstalled on them. When you power on a device, it starts (boots) up using its primary boot device. These devices also support secondary boot devices, allowing you to back up your primary boot device and configuration.

As new features and software fixes become available, you must upgrade Junos OS to use them. Before an upgrade, we recommend that you back up your primary boot device.

Understanding Junos OS Upgrades

On a services gateway, you can configure the primary or secondary boot device with a snapshot of the current configuration, default factory configuration, or rescue configuration. You can also replicate the configuration for use on another device.

If the SRX Series device does not have a secondary boot device configured and the primary boot device becomes corrupted, you can reload the Junos OS package onto the corrupted internal media from a USB flash drive or TFTP server.

Junos OS Upgrade Methods on the SRX Series Devices

SRX Series devices that ship from the factory with Junos OS Release 10.0 or later are formatted with the dual-root partitioning scheme.

Note

Junos OS Release 12.1X45 and later do not support single root partitioning.

Note

SRX100, SRX110, SRX210, SRX220, and SRX240 devices with 2 GB RAM cannot be upgraded to any Junos OS 12.1X46 Release after 12.1X46-D65. Attempting to upgrade to this release on devices with 2 GB RAM will trigger the following error: ERROR: Unsupported platform for 12.1X46 releases after 12.1X46-D65

.

Existing SRX Series devices that are running Junos OS Release 9.6 or earlier use the single-root partitioning scheme. While upgrading these devices to Junos OS Release 10.0 or later, you can choose to format the storage media with dual-root partitioning (strongly recommended) or retain the existing single-root partitioning.

Certain Junos OS upgrade methods format the internal media before installation, whereas other methods do not. To install Junos OS Release 10.0 or later with the dual-root partitioning scheme, you must use an upgrade method that formats the internal media before installation.

Note

If you are upgrading to Junos OS Release 10.0 without transitioning to dual-root partitioning, use the conventional CLI and J-Web user interface installation methods.

These upgrade methods format the internal media before installation:

  • Installation from the boot loader using a TFTP server

  • Installation from the boot loader using a USB storage device

  • Installation from the CLI using the partition option (available in Junos OS Release 10.0)

  • Installation using the J-Web user interface

These upgrade methods retain the existing partitioning scheme:

  • Installation using the CLI

  • Installation using the J-Web user interface

Warning

Upgrade methods that format the internal media before installation wipe out the existing contents of the media. Only the current configuration is preserved. Any important data must be backed up before starting the process.

Note

Once the media has been formatted with the dual-root partitioning scheme, you can use conventional CLI or J-Web user interface installation methods, which retain the existing partitioning and contents of the media, for subsequent upgrades.

Release History Table
Release
Description
SRX100, SRX110, SRX210, SRX220, and SRX240 devices with 2 GB RAM cannot be upgraded to any Junos OS 12.1X46 Release after 12.1X46-D65. Attempting to upgrade to this release on devices with 2 GB RAM will trigger the following error: ERROR: Unsupported platform for 12.1X46 releases after 12.1X46-D65
Junos OS Release 12.1X45 and later do not support single root partitioning