To view the ip helper-address configuration for an interface, use the show ip interfacecommand from EXEC privilege mode.Example of the show ip interface CommandR1_E600#show ip int tengigabitethernet 1/3TenGigabitEthernet 1/3 is up, line protocol is downInternet address is 10.11.0.1/24Broadcast address is 10.11.0.255Address determined by user inputIP MTU is 1500 bytesHelper address is 192.168.0.1192.168.0.2Directed broadcast forwarding is disabledProxy ARP is enabledSplit Horizon is enabledPoison Reverse is disabledICMP redirects are not sentICMP unreachables are not sentConfigure the System to be a DHCP ClientA DHCP client is a network device that requests an IP address and configuration parameters from a DHCPserver.Implement the DHCP client functionality as follows:• The switch can obtain a dynamically assigned IP address from a DHCP server. A start-up configurationis not received. Use bare metal provisioning (BMP) to receive configuration parameters (DellNetworking OS version and a configuration file). BMP is enabled as a factory-default setting on aswitch.A switch cannot operate with BMP and as a DHCP client simultaneously. To disable BMP in EXECmode, 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 theaddress.• A DHCP server manages and assigns IP addresses to clients from an address pool stored on theserver. For more information, refer to Configuring 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-channelinterfaces.• The public out-of-band management interface and default VLAN 1 are configured by default as aDHCP 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 DHCPrequests to a DHCP server to retrieve configuration information (IP address, boot-image filename, andconfiguration 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 configurationcommands to set up the switch. To interrupt a Jumpstart process, prevent a loop from occurring, andapply the FTOS image and startup configuration stored in the local flash, enter the stop jump-startcommand from the console. To reconfigure the switch so that it boots up in normal mode using theFTOS image and startup configuration file in local flash, enter the reload-type normal-reloadcommand and save it to the startup configuration:FTOS# reload-type normal-reloadFTOS# write memoryFTOS# reload• To re-enable Jumpstart mode for the next reload, enter the reload-type jump-start command.Dynamic Host Configuration Protocol (DHCP) 257
