Auto Image and Configuration Update 381
receipt of option 125, the switch downloads the text file from the TFTP
server, reads the name of the image file, and downloads the image file from
the TFTP server.
After the switch successfully downloads and installs the new image, it
automatically reboots. The download or installation might fail for one of the
following reasons:
• The path or filename of the image on the TFTP server does not match the
information specified in DHCP option 125.
• The downloaded image is the same as the current image.
• The validation checks, such as valid CRC Checksum, fails.
If the download or installation was unsuccessful, a message is logged.
Obtaining the Configuration File
If the DHCP OFFER identifies a configuration file, either as option 67 or in
the
file
field of the DHCP header, the switch attempts to download the
configuration file.
The TFTP client makes three unicast requests. If the unicast attempts fail, or
if the DHCP OFFER did not specify a TFTP server address, the TFTP client
makes three broadcast requests.
If the DHCP server does not specify a configuration file or download of the
configuration file fails, the Auto Configuration process attempts to download
a configuration file with the name dell-net.cfg. The switch unicasts or
broadcasts TFTP requests for a network configuration file in the same
manner as it attempts to download a host-specific configuration file.
The default network configuration file consists of a set of IP address-to-
hostname mappings, using the command ip host hostname
address
. The
switch finds its own IP address, as learned from the DHCP server, in the
NOTE: In stack of switches, the downloaded image is pushed to all members
attached to the stack at the time of download. For members who join the stack
after the download, the Stack Firmware Synchronization feature will push the
latest image to all members.
NOTE: The configuration file is required to have a file type of *.cfg.
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