Administration: File Management
DHCP Auto Configuration/Image Update
Cisco 350, 350X and 550X Series Managed Switches, Firmware Release 2.4, ver 0.4 109
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• The switch downloads the Indirect Image File and extracts from it the name of the
image file on the TFTP/SCP server.
• The switch compares the version of the TFTP server's image file with the version of
the switch active image.
• If the two versions are different, the new version is loaded into the non-active image, a
reboot is performed and the non-active image becomes the active image.
• When using the SCP protocol, a SYSLOG message is generated informing that reboot
is about to start.
• When using the SCP protocol, a SYSLOG message is generated acknowledging that
the Auto Update process is completed.
• When using the TFTP protocol, SYSLOG messages are generated by the copy process.
Auto Configuration Starts
• The device uses the TFTP/SCP server name/address and configuration file name/path
(DHCPv4 options: 66,150, and 67, DHCPv6 options: 59 and 60), if any, from the
DHCP message received.
• If the information is not sent by the DHCP server, the Backup Server IP Address/Name
and the Backup Configuration File Name (from the DHCP Auto Configuration/Image
Update) is used.
• The new configuration file is used if its name is different than the name of the
configuration file previously used on the device or if the device has never been
configured.
• The device is rebooted with the new configuration file, at the end of the Auto
Configuration/Image Update Process.
• SYSLOG messages are generated by the copy process.
Missing Options
• If the DHCP server did not send the TFTP/SCP server address in a DHCP option and
the backup TFTP/SCP server address parameter has not been configured, then:
- SCP—The Auto Configuration process is halted.
- TFTP—The device sends TFTP Request messages to a limited Broadcast address
(for IPv4) or ALL NODES address (for IPv6) on its IP interfaces and continues the
process of Auto Configuration/Image Update with the first answering TFTP server.
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