Administration: File Management
Auto Configuration/Image Update via DHCP
Cisco Small Business 200 Series Smart Switch Administration Guide 48
5
Auto Configuration/Image Update via DHCP
The Auto Configuration/Image Update feature provides a convenient method to automatically configure
Cisco Small Business 200, 300 and 500 switches in a network and upgrade their firmware. This process
enables the administrator to remotely ensure that the configuration and firmware of these devices in the
network are up-to-date.
This feature is comprised of the following parts:
• Auto Image Update—Automatic downloading a firmware image from a remote TFTP/SCP server. At
the end of the Auto Configuration/Image Update process, the device reboots itself to the firmware
image.
• 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.
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