Operation Manual – DHCPH3C S7500E Series Ethernet Switches Chapter 3 DHCP Relay Agent Configuration3-11[SwitchA-Vlan-interface1] dhcp select relay[SwitchA-Vlan-interface1] quit# Configure DHCP server group 1 with the DHCP server 10.1.1.1, and correlate theDHCP server group 1 with VLAN-interface 1.[SwitchA] dhcp relay server-group 1 ip 10.1.1.1[SwitchA] interface vlan-interface 1[SwitchA-Vlan-interface1] dhcp relay server-select 1Note:z Performing the configuration on the DHCP server is also required to guarantee theclient-server communication via the relay agent. Refer to DHCP ServerConfiguration Examples for DHCP server configuration information.z If the DHCP relay agent and server are on different subnets, routes in between mustbe reachable.3.6 Troubleshooting DHCP Relay Agent ConfigurationI. SymptomDHCP clients cannot obtain any configuration parameters via the DHCP relay agent.II. AnalysisSome problems may occur with the DHCP relay agent or server configuration. Enabledebugging and execute the display command on the DHCP relay agent to view thedebugging information and interface state information for locating the problem.III. SolutionCheck that:z The DHCP is enabled on the DHCP server and relay agent.z The address pool on the same subnet where DHCP clients reside is available onthe DHCP server.z The routes between the DHCP server and DHCP relay agent are reachable.z The relay agent interface connected to DHCP clients is correlated with correctDHCP server group and IP addresses for the group members are correct.
