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190
IP Addressing Commands
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DELL CONFIDENTIAL – PRELIMINARY 9/13/06 – FOR PROOF ONLY
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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. To deconfigure an acquired IP address, use the
no
form of this command.
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.