Configure a Cisco router to use an external DHCP server
When a device is added to the network, it sends a DHCP broadcast message to search for a server. By default, routers block and discard broadcast messages. To avoid this, it is necessary to configure a DHCP relay agent.
1. How to configure a DHCP relay agent
Section titled “1. How to configure a DHCP relay agent”1.1 Access the interface to which the devices that need an IP address are connected
Section titled “1.1 Access the interface to which the devices that need an IP address are connected”Router(config-if)# ip helper-address 10.5.5.101.2 Configure the external DHCP server IP
Section titled “1.2 Configure the external DHCP server IP”Router(config-if)# ip helper-address 10.5.5.10