Upgrades for SRX Series Firewalls

Learn how to upgrade Junos OS on SRX Series Firewalls with Juniper Networks, covering preparation, software download, verification, execution, and troubleshooting for a smooth transition and minimal downtime.

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

On an SRX Series Firewalls, you can configure the primary and secondary boot device each with a snapshot of the current configuration, the default factory configuration, or a rescue configuration. You can also replicate the configuration from one device to the other device on a firewall.

Your primary boot device may get corrupted and your firewall device may not have a secondary boot device configured. To resolve this issue, reload the Junos OS package onto the corrupted storage device from a USB flash drive or a Trivial File Transfer Protocol (TFTP) server.

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