Administration: File Management
DHCP Auto Configuration/Image Update
Cisco 350, 350X and 550X Series Managed Switches, Firmware Release 2.4, ver 0.4 107
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• Auto Configuration—Automatic downloading a configuration file from a remote
TFTP/SCP server. At the end of the Auto Configuration/Image process, the device
reboots itself to the configuration file.
NOTE If both Auto Image Update and Auto Configuration are requested, Auto Image Update is
performed first, then after reboot, Auto Configuration is performed and then a final reboot is
performed.
To use this feature, configure a DHCP server in the network with the locations and names of
the configuration file and firmware image of your devices. The devices in the network are
configured as DHCP clients by default. When the devices are assigned their IP addresses by
the DHCP server, they also receive information about the configuration file and firmware
image. If the configuration file and/or firmware image are different from the ones currently
used on the device, the device reboots itself after downloading the file and/or image. This
section describes these processes.
In addition to the ability to keep the devices in the network updated with the latest
configuration files and firmware image, Auto-Update/Configuration enables quick installation
of new devices on the network, since an out-of-the-box device is configured to retrieve its
configuration file and software image from the network without any manual intervention by
the system administrator. The first time that it applies for its IP address from the DHCP server,
the device downloads and reboots itself with the configuration file and/or image specified by
the DHCP server.
The Auto Configuration process supports downloading a configuration file that includes
sensitive information, such as RADIUS server keys and SSH/SSL keys, by using the Secured
Copy Protocol (SCP) and the Secure Sensitive Data (SSD) feature (See SSH Client
Authentication and Security: Secure Sensitive Data Management).
Download Protocols (TFTP or SCP)
Configuration files and firmware images can be downloaded from either a TFTP or an SCP
server.
The user configures the protocol to be used, as follows:
• Auto By File Extension—(Default) If this option is selected, a user-defined file
extension indicates that files with this extension are downloaded using SCP (over
SSH), while files with other extensions are downloaded using TFTP. For example, if
the file extension specified is.xyz, files with the xyz extension are downloaded using
SCP, and files with the other extensions are downloaded using TFTP. The default
extension is .scp.
• TFTP Only—The download is done through TFTP, regardless of the file extension of
the configuration file name.
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