Reference Guide

ICMP redirects are not sent
ICMP unreachables are not sent
Configure the System to be a DHCP Client
A DHCP client is a network device that requests an IP address and configuration parameters from a DHCP server.
Implement the DHCP client functionality as follows:
• The switch can obtain a dynamically assigned IP address from a DHCP server. A start-up configuration is not
received. Use bare metal provisioning (BMP) to receive configuration parameters (FTOS version and a
configuration file). BMP is enabled as a factory-default setting on a switch.
A switch cannot operate with BMP and as a DHCP client simultaneously. To disable BMP in EXEC mode, use the
stop bmp command. After BMP stops, the switch acts as a DHCP client.
• Acquire a dynamic IP address from a DHCP client is for a limited period or until the client releases the address.
• A DHCP server manages and assigns IP addresses to clients from an address pool stored on the server. For
more information, refer to Configuring the Server for Automatic Address Allocation.
• Dynamically assigned IP addresses are supported only on Ethernet interfaces: 10Gigabit, 40 Gigabit, and
100/1000/10000 Ethernet Interfaces. The DHCP client is supported on VLAN and port-channel interfaces.
• The public out-of-band management interface and default VLAN 1 are configured by default as a DHCP client to
acquire a dynamic IP address from a DHCP server.
Configuring the DHCP Client System
This section describes how to configure and view an interface as a DHCP client to receive an IP address.
FTOS Behavior: The ip address dhcp command enables DHCP server-assigned dynamic addresses on an
interface. The setting persists after a switch reboot. To stop DHCP transactions and save the dynamically acquired IP
address, use the shutdown command on the interface. To display the dynamic IP address and show DHCP as the
mode of IP address assignment, use the
show interface type slot/port command. To unconfigure the IP
address, use the no shutdown command when the lease timer for the dynamic IP address is expired. The interface
acquires a new dynamic IP address from the DHCP server.
To configure a secondary (backup) IP address on an interface, use the ip address command at the INTERFACE
configuration level.
Use the no ip address dhcp command to:
• Release the IP address dynamically acquired from a DHCP server from the interface.
• Disable the DHCP client on the interface so it cannot acquire a dynamic IP address from a DHCP server.
• Stop DHCP packet transactions on the interface.
When you enter the release dhcp command, the IP address dynamically acquired from a DHCP server is released
from an interface. The ability to acquire a new DHCP server-assigned address remains in the running configuration for
the interface. To acquire a new IP address, use the
renew DHCP command in EXEC Privilege mode or the ip
address dhcp command in INTERFACE Configuration mode.
To manually configure a static IP address on an interface, use the ip address command. A prompt displays to
release an existing dynamically acquired IP address. If you confirm, the ability to receive a DHCP server-assigned IP
address is removed.
To enable acquiring a dynamic IP address from a DHCP server on an interface configured with a static IP address, use
the ip address dhcp command. A prompt displays to confirm the IP address reconfiguration. If you confirm, the
statically configured IP address is released. An error message displays if you enter the release dhcp or renew
dhcp commands.
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