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Configure the System to be a DHCP Client
A DHCP client is a network device that requests an IP address and configuration 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 configuration
is not received. Use bare metal provisioning (BMP) to receive configuration parameters (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 Z9500 10-Gigabit and 40-Gigabit interfaces. The
DHCP client is supported on 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.
DHCP Client on a Management Interface
These conditions apply when you enable a management interface to operate as a DHCP client.
• The management default route is added with the gateway as the router IP address received in the
DHCP ACK packet. It is required to send and receive traffic to and from other subnets on the external
network. The route is added irrespective when the DHCP client and server are in the same or different
subnets. The management default route is deleted if the management IP address is released like other
DHCP client management routes.
• ip route for 0.0.0.0 takes precedence if it is present or added later.
• Management routes added by a DHCP client display with Route Source as DHCP in the show ip
management route and show ip management-route dynamic command output.
• Management routes added by DHCP are automatically reinstalled if you configure a static IP route
with the ip route command that replaces a management route added by the DHCP client. If you
remove the statically configured IP route using the no ip route command, the management route
is reinstalled. Manually delete management routes added by the DHCP client.
• To reinstall management routes added by the DHCP client that is removed or replaced by the same
statically configured management routes, release the DHCP IP address and renew it on the
management interface.
• Management routes added by the DHCP client have higher precedence over the same statically
configured management route. Static routes are not removed from the running configuration if a
dynamically acquired management route added by the DHCP client overwrites a static management
route.
• Management routes added by the DHCP client are not added to the running configuration.
NOTE: Management routes added by the DHCP client include the specific routes to reach a DHCP
server in a different subnet and the management route.
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Dynamic Host Configuration Protocol (DHCP)