Filter
Top Products
Obtaining the configuration file
Figure 51 Obtain the configuration file
Is the configuration file
contained in the DHCP
response?
Obtain the network
intermediate file
Search the domain name
corresponding to the IP address
in the network intermediate file
Yes
Obtain the specified
configuration file in the
response
Obtain the configuration
file corresponding to the
domain name
Obtain the default
configuration file
Remove the temporary
configurations and execute the
obtained configuration file
Remove the temporary
configurations and the device
starts without loading the
configuration file
No
Yes
No
No
Yes
No
No
Yes
Resolve an IP
address to a domain
name through DNS
Yes
Yes No
Yes
No
A device obtains its configuration file by using the following workflow:
• If the DHCP response contains the configuration file name, the device requests the specified
configuration file from the TFTP server.
• If not, the device tries to get its host name from the host name file obtained from the TFTP server. If
it fails, the device resolves its IP address to the host name through DNS server. Once the device gets
its host name, it requests the configuration file with the same name from the TFTP server.
• If all the operations fail, the device requests the default configuration file from the TFTP server.
TFTP request sending mode
The device selects to unicast or broadcast a TFTP request by using the following workflow:
• If a legitimate TFTP server IP address is contained in the DHCP response, the device unicasts a TFTP
request to the TFTP server.
• If not, the device resolves the TFTP server domain name contained in the DHCP response to the IP
address through the DNS server. If successful, the device unicasts a TFTP request to the TFTP server;
if not, the device broadcasts a TFTP request.
• If the IP address and the domain name of the TFTP server are not contained in the DHCP response
or they are illegitimate, the device broadcasts a TFTP request.
144