Administration: File Management
DHCP Auto Configuration
51 Cisco 500 Series Stackable Managed Switch Administration Guide Release 1.3
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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.
DHCP Server Options
DHCP messages might contain the configuration server name/address and the
configuration file name/path (these are optional options). These options are found
in the Offer message coming from the DHCPv4 servers and in the Information
Reply messages coming from DHCPv6 servers.
Backup information (configuration server name/address and configuration file
name/path) can be configured in the Auto Configuration page. This information is
used when the DHCPv4 message does not contain this information (but it is not
used by DHCPv6).
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