Users Guide

580 DHCP and USB Auto-Configuration

What Is the DHCP Auto Configuration Process?

If the USB Auto Configuration fails or is not used, the switch can use a

DHCP server to obtain configuration information from a TFTP server.

DHCP Auto Configuration is initiated every time the switch receives an

address lease via DHCP.

DHCP Auto Configuration is accomplished in three phases:

Assignment or configuration of an IP address for the switch

Assignment of a TFTP server

Obtaining image, network and host configuration files for the switch from

a TFTP server

Auto Configuration is successful when an image or configuration file is

downloaded to the switch or stack master from a TFTP server and processed.

What Files Does DHCP Auto-Configuration Use?

DHCP Auto-Configuration uses three types of files:

• Image Configuration File: This file contains a single line of ASCII text

with the path and filename of the switch firmware image located on the

TFTP server.

• Network Configuration File: This file contains one of more lines of ASCII

text with the command ip host followed by a switch IP address and a host

name on each line.

• Host Configuration File: This file contains one of more lines of ASCII CLI

configuration that are executed in Privileged Exec mode on the switch.

Each line contains a single command.

Obtaining IP Address Information

DHCP is enabled by default on the Out-of-Band (OOB) interface on Dell

EMC Networking N2200X-ON, N3000E-ON, N3100-ON, and N3200-ON

Series switches. DHCP is enabled by default on VLAN 1 on the Dell EMC

NOTE: The downloaded configuration file is not automatically saved to startup-

config. You must explicitly issue a save request (copy running-config startup-

config) in order to save the configuration. If the downloaded configuration is not

saved to the startup-config, DHCP auto configuration will be done every time the

DHCP lease expires.