Administrator Guide

Table Of Contents
550 DHCP and USB Auto-Configuration
Auto Configuration is successful when an image or configuration file is
downloaded to the switch or stack master from a TFTP server and processed.
Obtaining IP Address Information
DHCP is enabled by default on the Out-of-Band (OOB) interface on Dell
EMC Networking N3000, N3100-ON, and N4000 Series switches. DHCP is
enabled by default on VLAN 1 on the Dell EMC Networking N1100-ON,
N1500, N2000, and N2100-ON Series switches. If an IP address has not been
assigned, the switch issues requests for an IP address assignment.
A network DHCP server returns the following information:
IP address and subnet mask to be assigned to the interface
IP address of a default gateway, if needed for IP communication
After an IP address is assigned to the switch, if a hostname is not already
assigned, Auto Configuration issues a DNS request for the corresponding
hostname. This hostname is also displayed as the CLI prompt (as in response
to the hostname command).
Obtaining Other Dynamic Information
The following information is also processed and may be returned by a
BOOTP or DHCP server:
Name of configuration file (the file field in the DHCP header or option
67) to be downloaded from the TFTP server.
Identification of the TFTP server providing the file. The TFTP server can
be identified by name or by IP address as follows:
hostname: DHCP option 66 or the sname field in the DHCP header)
IP address: DHCP option 150 or the siaddr field in the DHCP header
Domain Name Server - Option 6
SYSLOG Server - Option 7
Client Host Name - Option 12
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.