Dell PowerConnect 5500 Series System User's Manual page 342

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Triggering the Auto-Update/Configuration Process
When the Auto-Update/Configuration feature is enabled (in the Auto
Update of Configuration/Image File page), the device automatically attempts
to download a new image or configuration file (under certain circumstances)
using one of the following processes:
• The Auto-Update process is triggered from the USB drive if a USB key in
the USB drive is found.
• The Auto-Configuration process is triggered from the USB drive after the
Auto-Update process completed and the device was rebooted (if a new
image file was loaded), and if the following conditions are fulfilled:
– There is a USB key in the USB drive.
– Force Configuration Download at Next Startup has been enabled by
the boot host dhcp command, or the Startup Configuration file is
empty.
See "Performing Auto-Update from a USB Drive" on page 343.
• The Auto-Update from a TFTP server is triggered if the following
conditions are fulfilled:
– The conditions for a USB Auto-Update are not fulfilled.
– An IP address of a TFTP server is received from a DHCP server.
– A file name is received from DHCP server.
• The Auto-Configuration from a TFTP server is triggered if the following
conditions are fulfilled:
– The conditions for USB Auto-Configuration are not fulfilled.
– The switch as DHCP client received a configuration file name or a
TFTP URL.
– Force Configuration Download at Next Startup enabled by the boot
host dhcp command, or, the Startup Configuration file is empty.
See "Preparations for Using Auto Configuration from a TFTP Server" on
page 345.
NOTES:
• DHCP client never triggers the Auto-Update process from a TFTP server
after attempting (whether successfully or not) to auto-update/configure
configuration/image file from the USB drive.
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Dell PowerConnect 55xx Systems User Guide
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