Configuring System Boot Image and Mode

When a system is powered on or reset, the current system boot image is loaded on to all system modules. To perform a system upgrade, change the current system boot image to the upgrade image, also referred to as the target image. Image upgrade can occur immediately, the next time the system boots, or by issuing a reset command. When specifying the new target image, you can optionally, specify the system boot mode parameter:

• Standard – All system slots are simultaneously upgraded taking the system out of operation for the duration of the upgrade. This is a non-high availability upgrade.
• High-availability – Providing all HAU preconditions are met, HAU groups are upgraded sequentially (one after another, but not in any specific order). If any HAU precondition is not met, an upgrade does not occur. See High Availability Upgrade Preconditions for HAU precondition details.

If the system boot mode is not specified, the boot mode is determined by the HAU default mode configuration. By default, the HAU default mode executes a standard system upgrade. See Configuring HAU Default Mode for HAU default mode details.

Use the set boot system image-file-name command in any command mode to set the target image for the firmware upgrade, optionally specifying the system boot mode.

Use the set boot system image-file-name high-availability command in any command mode to set the target image for the firmware upgrade and enable HAU, assuring that if a high availability upgrade is possible it will be performed, otherwise no upgrade will occur.

When entering the set boot system command, you are asked if you want to reset the system or start a high availability upgrade depending upon the command variation you entered. Answering y will immediately reset the system and begin the upgrade. Answering n will perform the upgrade the next time the system is reset.

Use the show boot system command to determine the current boot image.

Use the dir image-file-name command to display image details for the specified image.

Use the dir images command to display details for all available images on the system.