Administrator Guide

Table Of Contents

552 DHCP and USB Auto-Configuration

mytftpserverpath/N3000_N2000v6.3.0.1.stk

Option 125 also supports sub-option 6, which is the path to a configuration

file on the TFTP server. Only the path name is relevant. Configure the DHCP

server to use vendor ID 674 and the required sub-option 6 and a hexadecimal

encoded ASCII path value. If sub-option 6 is specified, the switch attempts to

download the configuration file <hostname>.cfg using the DHCP-supplied

host name (DHCP option 12). If that file is not found on the TFTP server,

the switch attempts to download the "host.cfg" file. The configuration file

consists of a series of CLI commands in ASCII text which are executed by the

switch in Privileged Exec mode.

For example, one might enter the following information:

• A2-02-00-00 — Dell Enterprise number 674. It should be written from

right to left. The number 674 in hexadecimal notation is 02 a2 00 00.

• 08 — Data Length (8 decimal)

• 06 — Sub-option code 6

• 06 — Sub-option length (10 decimal)

• Conversion of the file name from ACSII to hexadecimal:

"mypath" – 6D-79-70-61-74-68

After the switch successfully downloads and installs the new image, it

automatically reboots. The download or installation might fail for one of the

following reasons:

• The path or filename of the image on the TFTP server does not match the

information specified in DHCP option 125.

• The downloaded image is the same as the current image.

• The validation checks, such as valid CRC Checksum, fails.

If the download or installation was unsuccessful, a message is logged.

NOTE: In stack of switches, the downloaded image is pushed to all members

attached to the stack at the time of download. For members who join the stack

after the download, the Stack Firmware Synchronization feature, if enabled, will

push the latest image to all members.