4000 Router Series Fundamentals Configuration Guide

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• 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 Figure 50,

the device determines what to request from the TFTP server based on whether or

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. To do so, the device 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 50 Configuration file acquisition process