108
Figure 34 System startup process
Upgrade methods
Upgrading method Software types Remarks
Upgrading from the CLI:
Upgrading software through a
reboot
• Boot ROM image
• Comware images
This method is disruptive. You must reboot the
entire device to complete the upgrade.
Upgrading from the Boot
ROM menu
• Boot ROM image
• Comware software
images
Use this method when the device cannot start
up correctly.
IMPORTANT:
Upgrade an IRF fabric from the CLI rather than
the Boot ROM menu.
The Boot ROM menu method increases the
service downtime, because it requires that you
upgrade the member devices one by one.
This chapter only covers upgrading software from the CLI.
Upgrade procedure summary
To upgrade software from the CLI:
1. Download the upgrade software image file.
2. (Optional.) Preload the Boot ROM image to the Boot ROM.
If a Boot ROM upgrade is required, you can perform this task to shorten the subsequent
upgrade time. This task helps avoid upgrade problems caused by unexpected electricity failure.
If you skip this task, the device upgrades the Boot ROM automatically when it upgrades the
startup software images.
The Boot ROM image preloaded into the Boot ROM does not affect the device running status.
Start
Finish
Press Ctrl+B
promptly?
Boot ROM runs
Startup software images
run
System starts up and CLI
appears
Enter Boot menus to
upgrade Boot ROM or
startup software
images
Yes
No