Configuration File Acquisition Process - HP 6125XLG Configuration Manual

After the device obtains an IP address, it resolves the received DHCP reply to examine the following
fields:
Option 67 or the file field—Carries the configuration file name. The device resolves Option 67 first.
•
If Option 67 does not contain the configuration file name, the device resolves the file field.
Option 12—Carries the host name. This host name might be used to determine the configuration file
•
name, which is in the format host name.cfg.
Option 150—Carries the TFTP server IP address. If this option contains a valid TFTP server IP
•
address, the device starts the configuration file acquisition process. Otherwise, the device resolves
Option 66.
• Option 66—Carries the TFTP server domain name. If Option 150 does not contain a TFTP server IP
address, the device resolves this option for a TFTP server domain name and tries to communicate
with the DNS server indicated by Option 6 to get the TFTP server IP address.
Option 6—Carries the DNS server IP address.
•
For more information about DHCP, see Layer 3

Configuration file acquisition process

During the automatic-configuration parameter acquisition process, the device might or might not get a
TFTP server IP address:
If the device gets a TFTP server IP address, it starts the configuration file acquisition process by
•
unicasting a request to the TFTP server.
If not, the device starts the configuration file acquisition process by broadcasting a request. In this
•
case, the device resolves only the first reply.
As shown in
not it got a configuration file name during the automatic-configuration parameter acquisition process:
If the device got a configuration file name, it requests the specified configuration file.
•
If not, it requests a configuration file named in the format host name.cfg from the TFTP server, where
•
host name represents the host name of the device. If the device got no host name during the
automatic-configuration parameter acquisition process, it first requests the host name file
network.cfg, which contains mappings between IP addresses and host names. If the device fails to
get the host name file or the file contains no entry for the device's temporary IP address, it tries to
communicate with a DNS server to resolve the temporary IP address to a host name. After the
device gets the host name, it tries to obtain the configuration file for the host name.
If the device fails to get a configuration file specific for itself, it requests the default configuration file
device.cfg from the TFTP server.
Figure 33, the device determines what to request from the TFTP server based on whether or
IP Services Configuration Guide.
—
123