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• The TFTP server does not have a host name file. However, devices need to perform the following
tasks:
{ Use their IP addresses to obtain their host names.
{ Obtain configuration files named in the format of host name.cfg from the TFTP server.
• The DHCP server assigns the TFTP server domain name through the DHCP reply message. Devices
must use the domain name to obtain the IP address of the TFTP server.
Configuring the gateway
If the devices to be automatically configured and the servers for automatic configuration reside in
different network segments, you must perform the following tasks:
• Deploy a gateway and make sure the devices can communicate with the servers.
• Configure the DHCP relay agent feature on the gateway.
• Configure the UDP helper feature on the gateway.
When a device sends a request through a broadcast packet to the file server, the UDP helper
changes the broadcast packet to a unicast packet and forwards the unicast packet to the file server.
For more information about UDP helper, see Layer 3—IP Services Configuration Guide.
Selecting the interfaces used for automatic configuration
For fast automatic device configuration, connect only the management Ethernet interface on each device
to the network.
Starting and completing automatic configuration
1. Power on the devices to be automatically configured.
If a device does not find a next-start configuration file locally, it starts the automatic configuration
process to obtain a configuration file. If one attempt fails, the device waits 30 seconds and then
automatically starts the process again. To stop the process, press Ctrl+D.
After obtaining a configuration file, the device automatically executes the configuration file.
2. Use the save command to save the running configuration.
The device does not save the obtained configuration file locally. If you do not save the running
configuration, the device must use the automatic configuration feature again after a reboot.
For more information about the save command, see Fundamentals Command Reference.
Automatic configuration examples
Automatic configuration using TFTP server
Network requirements
As shown in Figure 41, two departments of a company are connected to the network through gateways
(Switch B and Switch C). Access devices Switch D, Switch E, Switch F, and Switch G do not have a
configuration file.
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