Restoring Factory-Default Boot EnvironmentVariablesThe Boot line determines the location of the image that is used to boot up the switch after restoring factory-default settings. Ideally, these locations contain valid images, which the switch uses to boot up.When you restore factory-default settings, you can either use a flash boot procedure or a network bootprocedure to boot the switch.When you use a flash boot procedure to boot the switch, the reset boot variables are displayed belowrestore bootvar in the command output.• If the primary boot line is A: and the A: partition contains a valid image, the primary boot line is set to A:,the secondary boot line is set to B: (if B: also contains a valid image), and default boot line is set to a NullString.• If the primary boot line is B: and the B: partition contains a valid image, the primary boot line is set to B:,the secondary boot line is set to A: (if A: also contains a valid image), and default boot line is set to a Nullstring.• If either partition contains an invalid or corrupted image, the partition is not set in any of the boot lines.If both partitions contain invalid images, the primary, secondary, and default boot lines are set to a Nullstring.When you use a network boot procedure to boot the switch, the reset boot variables are displayed belowrestore bootvar in the command output.• If the primary partition contains a valid image and the secondary partition does not contain a validimage, the primary boot line is set to A: and the secondary and default boot lines are set to a Null string.• If both partitions have valid images, the primary boot line value is set to the partition configured to bootthe device in case of a network failure. The secondary and default boot lines are set to a Null string.Important Points to Remember• The CLI remains at the boot prompt if no partition contains a valid image.• To enable a TFTP boot after restoring factory default settings, you must stop the boot process using theboot-line interface (BLI).• The tftpboot command does not work after you perform a reset bootvar because themanagement IP address, network mask, and gateway IP address are all reset to NULL.In case the system fails to reload the image from a flash partition, follow these steps:1 Power-cycle the chassis (pull the power cord and reinsert it).2 When prompted by the system, press the Esc key to abort the boot process.You are placed in the boot-line interface (BLI) at the BOOT_USER # prompt.Press any key3 Assign the new location of the image to be used when the system reloads.Switch Management 90
