Dell Force10 MXL Blade Configuration Manual page 176

FTOS Behavior:
The ip address dhcp command enables DHCP server-assigned dynamic IP addresses on an
interface. This setting persists after a switch reboot. If you enter the shutdown command on the
interface, DHCP transactions are stopped and the dynamically-acquired IP address is saved. Use the
show interface type slot/port command to display the dynamic IP address and DHCP as the mode of
IP address assignment. If you later enter the no shutdown command and the lease timer for the
dynamic IP address has expired, the IP address is unconfigured and the interface tries to acquire a
new dynamic address from DHCP server.
If you later enter the no shutdown command and the lease timer for the dynamic IP address has
expired, the IP address is released.
You cannot configure a secondary (backup) IP address on an interface using the ip address dhcp
command; you must use the ip address command at the interface configuration level.
When you enter the no ip address dhcp command:
- The IP address dynamically acquired from a DHCP server is released from the interface.
- The DHCP client is disabled on the interface; it can no longer acquire a dynamic IP address from a
DHCP server.
- DHCP packet transactions on the interface are stopped.
When you enter the release dhcp command, although the IP address that was 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, enter
either the renew dhcp command at the EXEC privilege level or the ip address dhcp command at the
interface configuration level.
When you manually configures a static IP address on an interface (ip address command), you are
prompted to release a dynamically-acquired IP address that already exists. If you confirm, the ability to
receive a DHCP server-assigned IP address is also removed.
On an interface already configured with a static IP address:
- If you enter the ip address dhcp command to enable the acquisition of a dynamic IP address from a
DHCP server, you are prompted to confirm the IP address reconfiguration. If you confirm, the
statically-configured IP address is released.
- An error message is displayed if you enter the release dhcp or renew dhcp command.
On an interface already configured with a dynamic IP address:
- If you enter renew dhcp command, the lease time of the dynamically acquired IP address is
renewed.
Important: To verify the currently configured dynamic IP address on an interface, enter the show ip
dhcp lease command. The show running-configuration command output only displays ip
address dhcp; the currently assigned dynamic IP address is not displayed.
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| Dynamic Host Configuration Protocol (DHCP)