Users Guide

Configuring the DHCP Client System
This section describes how to configure and view an interface as a DHCP client to receive an IP address.
Dell EMC Networking OS 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[/subport] 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.
To renew the lease time of the dynamically acquired IP, use the renew dhcp command on an interface already configured with
a dynamic IP address.
NOTE:
To verify the currently configured dynamic IP address on an interface, use the show ip dhcp lease command.
The show running-configuration command output only displays ip address dhcp. The currently assigned dynamic
IP address does not display.
To configure and view an interface as a DHCP client to receive an IP address, use the following commands.
1. Enter INTERFACE Configuration mode on an Ethernet interface.
CONFIGURATION mode
interface type slot/port[/subport]
2. Acquire the IP address for an Ethernet interface from a DHCP network server.
INTERFACE mode
ip address dhcp
Dynamically assigned IP addresses can be released without removing the DHCP client operation on the interface on a switch
configured as a DHCP client.
3. Manually acquire a new IP address from the DHCP server by releasing a dynamically acquired IP address while retaining the
DHCP client configuration on the interface.
EXEC Privilege mode
release dhcp interface type slot/port[/subport]
4. Acquire a new IP address with renewed lease time from a DHCP server.
EXEC Privilege mode
renew dhcp interface type slot/port[/subport]
To display DHCP client information, use the following show commands in EXEC Privilege mode.
● To display statistics about DHCP client interfaces, use the show ip dhcp client statistics interface type
slot/port[subport] command.
● To clear DHCP client statistics on a specified or on all interfaces, use the clear ip dhcp client statistics {all
| interface type slot/port[/subport]} command.
Dynamic Host Configuration Protocol (DHCP)
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