Administration: File Management
DHCP Auto Configuration
47 Cisco Small Business 200 Series Smart Switch Administration Guide
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DHCP Auto Configuration
Auto configuration enables passing configuration information to hosts on a TCP/IP
network. Based on this protocol, the Auto Configuration feature enables a device
to download configuration files from a TFTP/SCP server.
The device can be configured as a DHCPv4 client in which auto configuration from
a DHCPv4 server is supported and/or a DHCPv6 client in which auto configuration
from a DHCPv6 server is supported.
By default, the device is enabled as a DHCP client when the Auto Configuration
feature is enabled.
The Auto Configuration process also 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 Security: Secure Sensitive Data Management).
DHCPv4 Auto Configuration is triggered in the following cases:
• After reboot when an IP address is allocated or renewed dynamically (using
DHCPv4).
• Upon an explicit DHCPv4 renewal request and if the device and the server
are configured to do so.
• Upon automatic renewal of the DHCPv4 lease.
DHCPv6 Auto Configuration 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 interface, which is IPv6 enabled, is defined as a DHCPv6
stateless configuration client.
- When DHCPv6 messages are received from the server (for example,
when you press the Restart button on IPv6 Interfaces page,
- When DHCPv6 information is refreshed by the device.
- After rebooting the device when stateless DHCPv6 client is enabled.
• When the DHCPv6 server packets contain the configuration filename
option.
