Quick Reference Guide

218 IP Addressing Commands
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DELL CONFIDENTIAL – PRELIMINARY 5/15/12 – FOR PROOF ONLY
ip address dhcp
The ip address dhcp Interface Configuration (Ethernet, VLAN, port-channel) mode command
acquires an IP address for an Ethernet interface from the Dynamic Host Configuration Protocol
(DHCP) server. Use the no form of this command to deconfigure an acquired IP address.
Syntax
• ip address dhcp [ hostname host-name ]
• no ip address dhcp
• host-name — Specifies the name of the host to be placed in the DHCP option 12 field. This
name does not have to be the same as the host name specified in the
hostname Global
Configuration mode command. (Range: 1-20 characters)
Default Configuration
This command has no default configuration.
Command Mode
Interface Configuration (Ethernet, VLAN, port-channel) mode.
User Guidelines
•The ip address dhcp command allows any interface to dynamically learn its IP address by using
the DHCP protocol.
• Some DHCP servers require that the DHCPDISCOVER message have a specific host name. The
ip address dhcp hostname host-name command is most typically used when the host name is
provided by the system administrator.
• If the device is configured to obtain its IP address from a DHCP server, it sends a
DHCPDISCOVER message to provide information about itself to the DHCP server on the
network.
•If the
ip address dhcp command is used with or without the optional keyword, the DHCP option
12 field (host name option) is included in the DISCOVER message. By default, the specified
DHCP host name is the globally configured host name of the device. However, the
ip address
dhcp hostname
host-name command can be used to place a different host name in the DHCP
option 12 field.
•The
no ip address dhcp command deconfigures any IP address that was acquired, thus sending a
DHCPRELEASE message.