Chapter 1
| Initial Switch Configuration
Downloading a Configuration File and Other Parameters from a DHCP Server
– 60 –
The general framework for this DHCP option is set out in RFC 2132 (Option 60). This
information is used to convey configuration settings or other identification
information about a client, but the specific string to use should be supplied by your
service provider or network administrator. Options 60 (vendor-class-identifier), 66
(tftp-server-name) and 67 (bootfile-name) statements can be added to the server
daemon’s configuration file as described in the following section.
If the DHCP server has an index entry for a switch requesting service, it should reply
with the TFTP server name and boot file name. Note that the vendor class identifier
can be formatted in either text or hexadecimal, but the format used by both the
client and server must be the same.
Console(config)#interface vlan 2
Console(config-if)#ip dhcp client class-id hex 0000e8666572
Console(config-if)#
Downloading a Configuration File and Other Parameters from a DHCP Server
Information passed on to the switch from a DHCP server may also include a
configuration file to be downloaded and the TFTP servers where that file can be
accessed, as well as other parameters. If the Factory Default Configuration file is
used to provision the switch at startup, in addition to requesting IP configuration
settings from the DHCP server, it will also ask for the name of a bootup
configuration file and TFTP servers where that file is stored.
If the switch receives information that allows it to download the remote bootup file,
it will save this file to a local buffer, and then restart the provision process.
Note the following DHCP client behavior:
â—†
To enable dynamic provisioning via a DHCP server, this feature must be
enabled using the ip dhcp dynamic-provision command.
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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.
â—†
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.
â—†
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.
â—†
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
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