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.
• To display dynamic IP address lease information currently assigned to a DHCP client interface, use the
show ip dhcp lease [interface type slot/port[/subport]] command.
• To display log messages for all DHCP packets sent and received on DHCP client interfaces, use the
debug ip dhcp client packets [interface type slot/port[/subport] command.
• To display log message on DHCP client interfaces for IP address acquisition, IP address release, IP
address and lease time renewal, and release an IP address, use the [no] debug ip dhcp client
events [interface
type slot/port[/subport]] command.
Dynamic Host Configuration Protocol (DHCP)
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