Users Guide

• The switch can obtain a dynamically assigned IP address from a DHCP server. A start-up configuration is
not received. Use bare metal provisioning (BMP) to receive configuration parameters (Dell Networking
OS version and a configuration file). BMP is enabled as a factory-default setting on a switch.
A switch cannot operate with BMP and as a DHCP client simultaneously. To disable BMP in EXEC mode,
use the stop bmp command. After BMP stops, the switch acts as a DHCP client.
• Acquire a dynamic IP address from a DHCP client is for a limited period or until the client releases the
address.
• A DHCP server manages and assigns IP addresses to clients from an address pool stored on the server.
For more information, refer to Configuring the Server for Automatic Address Allocation.
• Dynamically assigned IP addresses are supported on Ethernet, VLAN, and port-channel interfaces.
• The public out-of-band management interface and default VLAN 1 are configured by default as a DHCP
client to acquire a dynamic IP address from a DHCP server.
• By default, the switch is configured to operate in BMP mode as a DHCP client that sends DHCP requests
to a DHCP server to retrieve configuration information (IP address, boot-image filename, and
configuration file). All ports and management interfaces are brought up in Layer 3 mode and pre-
configured with no shutdown and no ip address. For this reason, you cannot enter configuration
commands to set up the switch. To interrupt a BMP process, prevent a loop from occurring, and apply
the Dell Networking OS image and startup configuration stored in the local flash, enter the
stop bmp
command from the console. To reconfigure the switch so that it boots up in normal mode using the
Dell Networking OS image and startup configuration file in local flash, enter the reload-type
normal-reload
command and save it to the startup configuration:
Dell# reload-type normal-reload
Dell# write memory
Dell# reload
• To re-enable BMP mode for the next reload, enter the reload-type jump-start command.
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 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.
Dynamic Host Configuration Protocol (DHCP) 315