Configure the System to be a DHCP ClientA 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 baremetal provisioning (BMP) to receive configuration parameters (Dell Networking OS version and a configuration file). BMP isenabled 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 bmpcommand. 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 on Ethernet, 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 adynamic IP address from a DHCP server.• By default, the switch is configured to operate in Jumpstart mode as a DHCP client that sends DHCP requests to a DHCP serverto retrieve configuration information (IP address, boot-image filename, and configuration file). All ports and managementinterfaces are brought up in Layer 3 mode and pre-configured with no shutdown and no ip address. For this reason, youcannot enter configuration commands to set up the switch. To interrupt a Jumpstart process, prevent a loop from occurring, andapply the FTOS image and startup configuration stored in the local flash, enter the stop jump-start command from the console.To reconfigure the switch so that it boots up in normal mode using the FTOS image and startup configuration file in local flash,enter the reload-type normal-reload command and save it to the startup configuration:FTOS# reload-type normal-reloadFTOS# write memoryFTOS# reload• To re-enable Jumpstart mode for the next reload, enter the reload-type jump-start command.Configuring the DHCP Client SystemThis section describes how to configure and view an interface as a DHCP client to receive an IP address.Dell Networking OS Behavior: The ip address dhcp command enables DHCP server-assigned dynamic addresses on aninterface. The setting persists after a switch reboot. To stop DHCP transactions and save the dynamically acquired IP address, usethe shutdown command on the interface. To display the dynamic IP address and show DHCP as the mode of IP addressassignment, use the show interface type slot/port[/subport] command. To unconfigure the IP address, use the noshutdown command when the lease timer for the dynamic IP address is expired. The interface acquires a new dynamic IP addressfrom the DHCP server.To configure a secondary (backup) IP address on an interface, use the ip address command at the INTERFACE configurationlevel.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 aninterface. The ability to acquire a new DHCP server-assigned address remains in the running configuration for the interface. Toacquire a new IP address, use the renew DHCP command in EXEC Privilege mode or the ip address dhcp command inINTERFACE Configuration mode.To manually configure a static IP address on an interface, use the ip address command. A prompt displays to release an existingdynamically acquired IP address. If you confirm, the ability to receive a DHCP server-assigned IP address is removed.Dynamic Host Configuration Protocol (DHCP) 289
