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Dell Configuration Guide for the S4048–ON System 9.14.2.6

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Restoring Factory Default Environment Variables

The Boot line determines the location of the image that is used to boot up the chassis after restoring factory default settings. Ideally, these locations contain valid images, using which the chassis boots up.

When you restore factory-default settings, you can either use a flash boot procedure or a network boot procedure to boot the switch.

When you use the flash boot procedure to boot the device, the boot loader checks if the primary or the secondary partition contains a valid image. If the primary partition contains 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 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. Hit any key to abort the boot process. You enter uBoot immediately, the => prompt indicates success.

    (during bootup)

    press any key

  3. Assign the new location to the Dell EMC Networking OS image it uses when the system reloads.

    uBoot mode

    => setenv primary_boot f10boot

    Boot variable (f10boot) can take the following values:

    • flash0 — to boot from flash partition A.

    • flash1 — to boot from flash partition B.

    • tftp://server-ip/image-file-name — to boot from the network.

  4. Assign an IP address to the Management Ethernet interface.

    uBoot mode

    => setenv ipaddr ip_address

    For example, 10.16.150.105.

    => setenv netmask mask

    For example, 255.255.0.0.

  5. Assign an IP address as the default gateway for the system.

    uBoot mode

    => setenv gatewayip gateway_ip_address

    For example, 10.16.150.254.

  6. Save the modified environmental variables.

    uBoot mode

    => saveenv

  7. Reload the system.

    uBoot mode

    reset

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