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Dell EMC Configuration Guide for the S3100 Series 9.14.2.4

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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 EMC 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 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.

To manually configure 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 confirm, 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 configured with a static IP address, use the ip address dhcp command. A prompt displays to confirm the IP address reconfiguration. If you confirm, the statically configured 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 configured with a dynamic IP address.

NOTE To verify the currently configured 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 configure and view an interface as a DHCP client to receive an IP address, use the following commands.

  1. Enter INTERFACE Configuration mode on an Ethernet interface.
    CONFIGURATION mode
    interface type slot/port
  2. Acquire the IP address for an Ethernet interface from a DHCP network server.
    INTERFACE mode
    ip address dhcp
    Dynamically assigned IP addresses can be released without removing the DHCP client operation on the interface on a switch configured as a DHCP client.
  3. Manually acquire a new IP address from the DHCP server by releasing a dynamically acquired IP address while retaining the DHCP client configuration on the interface.
    EXEC Privilege mode
    release dhcp interface type slot/port
  4. Acquire a new IP address with renewed lease time from a DHCP server.
    EXEC Privilege mode
    renew dhcp interface type slot/port
To display DHCP client information, use the following show commands in EXEC Privilege mode.
  • To display statistics about DHCP client interfaces, use the show ip dhcp client statistics interface type slot/port command.
  • To clear DHCP client statistics on a specified or on all interfaces, use the clear ip dhcp client statistics {all | interface type slot/port} command.
  • To display dynamic IP address lease information currently assigned to a DHCP client interface, use the show ip dhcp lease [interface type slot/port] command.
  • To display log messages for all DHCP packets sent and received on DHCP client interfaces, use the debug ip dhcp client packets [interface type slot/port command.
  • To display log message on DHCP client interfaces for IP address acquisition, IP address release, IP address and lease time renewal, and release an IP address, use the [no] debug ip dhcp client events [interface type slot/port] command.

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