Dell S6000 FTOS 9.0(2.0) Configuration Guide for the System - Page 247

Debug DHCP server Task Display debug information for DHCP server. Command Syntax debug ip dhcp server [events | packets] Command Mode EXEC Privilege DHCP Clear Commands Task Clear DHCP binding entries for the entire binding table. Clear a DHCP binding entry for an individual IP address. Clear a DHCP address conflict. Clear DHCP server counters. Command Syntax clear ip dhcp binding clear ip dhcp binding ip address clear ip dhcp conflict clear ip dhcp server statistics Command Mode EXEC Privilege EXEC Privilege EXEC Privilege EXEC Privilege Configure the System to be a Relay Agent DHCP clients and servers request and offer configuration information via broadcast DHCP messages. Routers do not forward broadcasts, so if there are no DHCP servers on the subnet, the client does not receive a response to its request and therefore cannot access the network. You can configure an interface on the Dell Networking system to relay the DHCP messages to a specific DHCP server using the command ip helper-address dhcp-address from INTERFACE mode, as shown in the following figure. Specify multiple DHCP servers by entering the ip helper-address dhcp-address command multiple times. When ip helper-address is configured, the system listens for DHCP broadcast messages on port 67. The system rewrites packets received from the client and forwards it via unicast; the system rewrites the destination IP address and writes its own address as the relay device. Responses from the server are unicast back to the relay agent on port 68, and the relay agent rewrites the destination address and forwards the packet to the client subnet via broadcast. Note: DHCP Relay is not available on Layer 2 interfaces. Dynamic Host Configuration Protocol (DHCP) | 225