Dell PowerConnect 8024 User Configuration Manual page 336

• Name of configuration file (the
67) to be downloaded from the TFTP server.
• Identification of the TFTP server providing the file. The TFTP server can
be identified by name or by IP address as follows:
– hostname: DHCP option 66 or the
– IP address: DHCP option 150 or the
When a DHCP OFFER identifies the TFTP server more than once, the
DHCP client selects one of the options in the following order:
66, option 150,
server is required to translate the name to an IP address.
The DHCP client on the switch also processes the name of the text file
(option 125, the V-I vendor-specific Information option) which contains the
path to the image file.
Obtaining the Image
Auto Configuration attempts to download an image file from a TFTP server
only if no configuration file was found in the internal flash, or even with a
saved configuration file that has Auto Configuration enabled.
The network DHCP server returns a DHCP OFFER message with option
125. When configuring the network DHCP server for image downloads, you
must include Option 125 and specify the Dell Enterprise Number, 674.
Within the Dell section of option 125, sub option 5 must specify the path and
name of a file on the TFTP server. This file is not the image file itself, but
rather a text file that contains the path and name of the image file. Upon
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.
336
Auto Image and Configuration Update
siaddr
. If the TFTP server is identified by hostname, a DNS
file field in the DHCP header or option
sname field in the DHCP header)
siaddr field in the DHCP header
sname
, option