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secondary partition contains a valid image, then the primary boot line is set to B: and the secondary and
default boot lines are set to a Null String. If both the partitions contain invalid images, then primary,
secondary, and default boot line values are set to a Null string.
When you use the Network boot procedure to boot the device, the boot loader checks if the primary
partition contains a valid image. If a valid image exists on the primary partition and the secondary partition
does not contain a valid image, then the primary boot line is set to A: and the secondary and default boot
lines are set to a Null string. If the secondary partition also contains a valid image, then the primary boot
line value is set to the partition that is configured to be used to boot the device in a network failure
scenario. The secondary and default boot line values are set to a Null string.
Important Points to Remember
• The Chassis remains in boot prompt if none of the partitions contain valid images.
• To enable TFTP boot after restoring factory default settings, you must stop the boot process in BLI.
In case the system fails to reload the image from the partition, perform the following steps:
1. Power-cycle the chassis (pull the power cord and reinsert it).
2. Press esc key to abort the boot process (while the system prompts to)
You enter BLI immediately, as indicated by the BOOT_USER # prompt.
press any key
3. Assign the new location of the FTOS image to be used when the system reloads.
To boot from flash partition A:
BOOT_USER # boot change primary
boot device : flash
file name : systema
BOOT_USER #
To boot from flash partition B:
BOOT_USER # boot change primary
boot device : flash
file name : systemb
BOOT_USER #
To boot from network:
BOOT_USER # boot change primary
boot device : tftp
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