Service Manual

Congure the System to be a DHCP Client
A DHCP client is a network device that requests an IP address and conguration parameters from a DHCP server.
Implement the DHCP client functionality as follows:
• The switch can obtain a dynamically assigned IP address from a DHCP server. A start-up conguration is not received. Use bare
metal provisioning (BMP) to receive conguration parameters (Dell Networking OS version and a conguration le). 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 Conguring the Server for Automatic Address Allocation.
• Dynamically assigned IP addresses are supported only on Ethernet interfaces: 10Gigabit, 40 Gigabit, and 100/1000/10000
Ethernet Interfaces. The DHCP client is supported on VLAN and port-channel interfaces.
• The public out-of-band management interface and default VLAN 1 are congured by default as a DHCP client to acquire a
dynamic IP address from a DHCP server.
• 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 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.
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Dynamic Host Conguration Protocol (DHCP)