CLI Reference Guide-R05

Chapter 1 | Initial Switch Configuration
Downloading a Configuration File and Other Parameters from a DHCP Server
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Note the following DHCP client behavior:
◆ To enable dynamic provisioning via a DHCP server, this feature must be
enabled using the ip dhcp dynamic-provision command.
◆ The bootup configuration file received from a TFTP server is stored on the
switch with the original file name. If this file name already exists in the switch,
the file is overwritten.
◆ If the name of the bootup configuration file is the same as the Factory Default
Configuration file, the download procedure will be terminated, and the switch
will not send any further DHCP client requests.
◆ If the switch fails to download the bootup configuration file based on
information passed by the DHCP server, it will not send any further DHCP client
requests.
◆ If the switch does not receive a DHCP response prior to completing the bootup
process, it will continue to send a DHCP client request once a minute. These
requests will only be terminated if the switch’s address is manually configured,
but will resume if the address mode is set back to DHCP.
To successfully transmit a bootup configuration file to the switch, the DHCP
daemon (using a Linux based system for this example) must be configured with the
following information:
◆ Options 60, 66 and 67 statements can be added to the daemon’s configuration
file.
◆ By default, DHCP option 66/67 parameters are not carried in a DHCP server
reply. To ask for a DHCP reply with option 66/67 information, the DHCP client
request sent by this switch includes a “parameter request list” asking for this
information. Besides these items, the client request also includes a “vendor
class identifier” that allows the DHCP server to identify the device, and select
the appropriate configuration file for download. This information is included in
Option 55 and 124.
Table 1: Options 60, 66 and 67 Statements
Option
Statement
Keyword Parameter
60 vendor-class-identifier a string indicating the vendor class identifier
66 tftp-server-name a string indicating the tftp server name
67 bootfile-name a string indicating the bootfile name