HP 4800G Series Configuration Manual page 1967

Obtaining the configuration file
Figure 1-3 Obtain the configuration file
No
Yes
Yes
Yes
Remove the temporary
configurations and execute the
obtained configuration file
The device obtains the configuration file from the TFTP server based on its resolution of the
configuration file name in the DHCP response:
If the DHCP response contains information such as configuration file name, the device requests
the specified configuration file from the TFTP server.
If no information such as configuration file name is contained in the DHCP response, the device
should obtain its host name first and then requests the configuration file corresponding with the
host name. The device can obtain its host name in two steps: obtaining the intermediate file from
the TFTP server and then searching in the intermediated file for its host name corresponding with
the IP address of the device; if fails, the device obtains the host name from the DNS server.
If the device fails to obtain the specified configuration file and resolve its host name or fails to obtain
the configuration file corresponding with the host name, it requests the default configuration file
from the TFTP server.
Sending mode of a TFTP request
The device selects the sending mode of the TFTP request based on its resolution of the TFTP server's
domain name and IP address in the DHCP response:
If a legitimate TFTP server IP address is contained in the DHCP response, the device unicasts a
TFTP request to the TFTP server and does not resolve the domain name of the TFTP server.
Otherwise, the device resolves the TFTP domain name.
If a legitimate TFTP server domain name is contained in the DHCP response, the device resolves
the IP address of the TFTP server through DNS server. If succeeds, the device unicasts a TFTP
request to the TFTP server; if fails, the device broadcasts a TFTP request to the TFTP server.
Yes
Is the configuration file
contained in the DHCP
response?
No
Obtain the network
intermediate file
Yes
Search the domain name
corresponding to the IP address
in the network intermediate file
No
Resolve an IP No
address to a domain
name through DNS
Yes
Obtain the configuration
file corresponding to the
domain name
No
No
Obtain the default
configuration file
No
Remove the temporary
configurations and the device
starts without loading the
configuration file
1-6
Obtain the specified
configuration file in the
response
Yes