Simplify configuration tasks and reduce network construction cost. Dynamic address
assignment significantly simplifies equipment configuration, and even reduces
deployment cost if devices are deployed in the places where there are no professionals.
Centralized management. During configuration management on several subnets, any
configuration parameter can be changed simply by modifying and updating
configurations in the DHCP server.
20.3 Introduction to DHCP Client
The DHCP client enables devices to obtain IP addresses and other configuration parameters
from the DHCP server automatically. The DHCP client brings the following advantages:
Shorten device configuration and deployment time.
Reduce the possibility of configuration error.
Allow centralized management on IP address assignment for devices.
20.4 Introduction to DHCP Relay
Agent
The DHCP relay agent forwards DHCP packets between the DHCP server and the client.
When the DHCP client and the server are not located in the same subnet, a DHCP relay
agent must be available for forwarding DHCP requests and response messages. Data
forwarding by the DHCP relay agent is different from routing and forwarding in that
transparent transmission is used for routing and forwarding where the device often does not
modify the contents in the IP packet. However, upon receiving a DHCP message, the DHCP
relay agent regenerates and forwards a DHCP message.
In the perspective of the DHCP client, the DHCP relay agent works like a DHCP server, I the
perspective of the DHCP server, the DHCP relay agent works like a DHCP client.
20.5 Configuring DHCP
To configure DHCP, perform the following tasks, of which the first three configuration tasks
are compulsory.
Enabling DHCP Server and Relay Agent (required)
Configuration of DHCP Excluded Addresses (required)
Configuration of DHCP Address Pool (required)
Binding Address Manually (optional)
Configuring the times of the Ping packet (optional)
Configuring Packet Ping Timeout (optional)
Ethernet interface DHCP client configuration (optional)
DHCP client configuration of the PPP encapsulation link (optional).
DHCP client configuration of the RP encapsulation link (optional)
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