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Typical Autoinstallation Process on a New Device
When a device is powered on for the first time,
it performs the following autoinstallation tasks:
- The new device sends out DHCP,
BOOTP, RARP, or SLARP requests on each connected interface simultaneously
to obtain an IP address.
If a DHCP server responds, it provides the device with some
or all of the following information:
- After the new device acquires
an IP address, the autoinstallation process on the device attempts
to download a configuration file in the following ways:
- If the DHCP server
specifies the host-specific configuration file (boot file) hostname.conf, the device uses that filename in the
TFTP server request. (In the filename, hostname is the hostname of the new device.) The autoinstallation process
on the new device makes three unicast TFTP requests for hostname.conf. If these attempts fail, the device
broadcasts three requests to any available TFTP server for the file.
- If the new device cannot
locate hostname.conf, the autoinstallation
process unicasts or broadcasts TFTP requests for a default device
configuration file called network.conf, which contains hostname-to-IP
address mapping information, to attempt to find its hostname.
- If network.conf contains no hostname entry
for the new device, the autoinstallation process sends
out a DNS request and attempts to resolve the new device's IP address
to a hostname.
- If the new device can determine its hostname,
it sends a TFTP request for the hostname.conf file.
- If the new device is unable to map its IP
address to a hostname, it sends TFTP requests for the default configuration
- After the new device locates a configuration
file on a TFTP server, autoinstallation downloads the file, installs
the file on the device, and commits the configuration.
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