CLI Reference Guide-R07

Table Of Contents

Chapter 1

| Initial Switch Configuration

Downloading a Configuration File and Other Parameters from a DHCP Server

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DHCP client Identifier (Option 60) is used by DHCP clients to specify their unique

identifier. The client identifier is optional and can be specified while configuring

DHCP on the primary network interface. DHCP Option 60 is disabled by default.

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:

◆ 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