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 Jumpstart 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 Jumpstart process, prevent a loop from occurring, and
apply the FTOS image and startup configuration stored in the local flash, enter the stop jump-start
command from the console. To reconfigure the switch so that it boots up in normal mode using the
FTOS image and startup configuration file in local flash, enter the reload-type normal-reload
command and save it to the startup configuration:
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.
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.
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Dynamic Host Configuration Protocol (DHCP)
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