IP Addressing Commands 207
Default Configuration
This command has no default configuration.
Command Mode
Interface Configuration (Ethernet, VLAN, port-channel).
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 most
typical usage of the
ip address dhcp
hostname
host-name
command is when
host-name
is the host
name provided by the system administrator.
• If a 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 device globally configured host name.
• However, you can use the
ip address dhcp hostname
host-name
command to place a different name in
the DHCP option 12 field than the globally configured host name of the device.
• The
no ip address dhcp
command deconfigures any IP address that was acquired, thus sending a
DHCPRELEASE message.
Example
The following example acquires an IP address on an Ethernet interface from DHCP.
ip default-gateway
The ip default-gateway Global Configuration mode command defines a default gateway (router).
Use the no form of this command to remove the default gateway.
Syntax
• ip default-gateway ip-address
• no ip default-gateway
•
ip-address
— Valid IP address that specifies the IP address of the default gateway.
Default Configuration
No default gateway is defined.
Console (config)# interface ethernet g8
Console (config-if)# ip address dhcp
5400_CLI.book Page 207 Wednesday, December 17, 2008 4:33 PM
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