Cisco Small Business 200 Series Administration Manual page 52

Administration: File Management
Auto Configuration/Image Update via DHCP
- 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.
Download Protocol Selection
• The copy protocol (SCP/TFTP) is selected, as described in
SCP
• When downloading using SCP, the device accepts any specified SCP/SSH server (without
authentication) if either of the following is true:
- The SSH server authentication process is disabled. By default the SSH server authentication is
disabled in order to allow downloading configuration file for devices with factory default
configuration (for example out-of-box devices).
- The SSH Server is configured in the SSH Trusted Servers list.
If the SSH server authentication process is enabled, and the SSH server is not found in the SSH
Trusted Servers list, the Auto Configuration process is halted.
• If the information is available, the SCP server is accessed to download the configuration file or image
from it.
Auto Configuration/Image Update Trigger
Auto Configuration/Image Update via DHCPv4 is triggered when the following conditions are fulfilled:
• The IP address of the device is dynamically assigned/renewed at reboot, or explicitly renewed by
administrative action, or automatically renewed due to an expiring lease.
activated in the IPv4 Interface page.
• If Auto Image Update is enabled, the Auto Image Update process is triggered when an indirect image
file name is received from a DHCP server or a backup indirect image file name has been configured.
Indirect means that this is not the image itself, but rather a file that holds the path name to the image.
• If Auto Configuration is enabled, the Auto Configuration process is triggered when the configuration
file name is received from a DHCP server or a backup configuration file name has been configured.
Auto Configuration/Image Update via DHCPv6 is triggered when the following conditions are fulfilled:
• When a DHCPv6 server sends information to the device. This occurs in the following cases:
- When an IPv6-enabled interface is defined as a DHCPv6 stateless configuration client.
Cisco Small Business 200 Series Smart Switch Administration Guide
Download Protocols (TFTP or
Explicit renewal can be
5
SCP).
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