Administrator Guide

Switch Management Commands 1920
release dhcp
Use the release dhcp command to force the DHCPv4 client to release a
leased address.
Syntax
release dhcp interface-id
• interface-id—Any valid VLAN interface. See Interface Naming
Conventions for interface representation.
Default Configuration
This command has no default configuration.
Command Mode
Privileged Exec
User Guidelines
The DHCP client sends a DHCP RELEASE message telling the DHCP
server that it no longer needs the IP address, and that the IP address can be
reassigned to another client. The interface method does not change and will
still be DHCP even after issuing this command. To lease an IP address again,
issue either the renew dhcp interface-id command below or ip address dhcp
(Interface Configuration) command in interface mode. If the IPv4 address
on the interface was not assigned by DHCP, then the command fails and
displays the following error message: Error! Interface does not have a DHCP
originated address.
The release dhcp option is applicable only for IP interfaces and not for the
Out-of-Band port. Use the ip address (Out-of-Band) none command on the
Out-of-Band interface to clear a DHCP-acquired address.
Example
console#release dhcp vlan 2
renew dhcp
Use the renew dhcp command to force the DHCP client to immediately
renew an IPv4 address lease.