165
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.
6.2.1.3. Obtaining the Image
Auto Install attempts to download an image file from a TFTP server only if the switch loads with a saved
configuration file that has Auto Install enabled (the boot-system host autoinstall command) or if Auto
Install has been administratively activated by issuing the boot-system autoinstall start command during
switch operation.
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 Broadcom Enterprise Number,
4413. Within the Broadcom 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:
ï‚·
The path or filename of the image on the TFTP server does not match the information
specified in DHCP option 125.
ï‚·
The downloaded image is the same as the current image.
ï‚·
The validation checks, such as valid CRC Checksum, fails.
If the download or installation was unsuccessful, a message is logged.
6.2.1.4. 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.
Note: The configuration file is required to have a file type of *.cfg.
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
Install process attempts to download a configuration file with the name fp-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-host name mappings, using the
command ip host hostname address. The switch finds its own IP address, as learned from the DHCP server,
in the configuration file and extracts its host name from the matching command. If the default network
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