Cisco 500 Series Administration Manual page 65

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• The switch downloads the Indirect Image File and extracts from it the name
of the TFTP/SCP server's image file.
• 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 page) 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
Administration: File Management
Auto Configuration/Image Update via DHCP
Cisco 500 Series Stackable Managed Switch Administration Guide