Service Manual

• By default, the switch is congured to operate in Jumpstart mode as a DHCP client that sends DHCP requests to a DHCP server
to retrieve conguration information (IP address, boot-image lename, and conguration le). All ports and management
interfaces are brought up in Layer 3 mode and pre-congured with no shutdown and no ip address. For this reason, you
cannot enter conguration commands to set up the switch. To interrupt a Jumpstart process, prevent a loop from occurring, and
apply the FTOS image and startup conguration stored in the local ash, enter the stop jump-start command from the console.
To recongure the switch so that it boots up in normal mode using the FTOS image and startup conguration le in local ash,
enter the reload-type normal-reload command and save it to the startup conguration:
FTOS# reload-type normal-reload
FTOS# write memory
FTOS# reload
• To re-enable Jumpstart mode for the next reload, enter the reload-type jump-start command.
Conguring the DHCP Client System
This section describes how to congure 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 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 uncongure 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 congure a secondary (backup) IP address on an interface, use the ip address command at the INTERFACE conguration
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 conguration 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 Conguration mode.
To manually congure 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 conrm, 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 congured with a static IP address, use the ip
address dhcp
command. A prompt displays to conrm the IP address reconguration. If you conrm, the statically congured 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 congured with a
dynamic IP address.
NOTE: To verify the currently congured 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 congure and view an interface as a DHCP client to receive an IP address, use the following commands.
1. Enter INTERFACE Conguration 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.
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Dynamic Host Conguration Protocol (DHCP)