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101

Ethernet Interface Configuration Command Set Command Reference Guide

ip address dhcp

Use the ip address dhcp command to use Dynamic Host Configuration Protocol (DHCP) to obtain an

address on the Ethernet interface. Use the no form of this command to remove a configured IP address

(using DHCP) and disable DHCP operation on the interface.

ip address dhcp {client-id [ <interface> | <identifier> ] hostname “<string>” }

Syntax Description

client-id

*Optional

Specifies the client identifier used when obtaining an IP address from a DHCP

server.

Specifying an interface defines the client identifier as the hexadecimal MAC

address of the specified interface (including a hexadecimal number added to the

front of the MAC address to identify the media type).

For example, specifying the

client-id ethernet 0/1

(where the Ethernet interface

has a MAC address of d217.0491.1150) defines the client identifier as

01:d2:17:04:91:11:50

(where 01 defines the media type as Ethernet).

Specify a custom client-identifier using a text string (that is converted to a

hexadecimal equivalent) or 7 to 28 hexadecimal numbers (with colon delimiters).

For example, a custom client identifier of

0f:ff:ff:ff:ff:51:04:99:a1

may be entered

using the <identifier> option.

host-name

*Optional

Specifies a text string (to override the global router name) to use as the name in

the DHCP option 12 field.

“<string>”

String (encased in quotation marks) of up to 35 characters to use as the name of

the host for DHCP operation.

Default Values

client-id

*Optional

By default, the client identifier is populated using the following formula:

TYPE: INTERFACE SPECIFIC INFO : MAC ADDRESS

Where TYPE specifies the media type in the form of one hexadecimal byte (refer

to the

hardware-address

command for a detailed listing of media types) and the

MAC ADDRESS is the Media Access Control (MAC) address assigned to the first

Ethernet interface in the unit in the form of six hexadecimal bytes. (For units with

a single Ethernet interface, the MAC ADDRESS assigned to ethernet 0/1 is used

in this field).

INTERFACE SPECIFIC INFO is only used for frame relay interfaces and can be

determined using the following:

FR_PORT# : Q.922 ADDRESS

Where the FR_PORT# specifies the label assigned to the virtual frame relay

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