Configuration Guide DHCP Configuration
Decrease network access cost. Generally, dynamic address assignment
costs less than static address assignment.
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.
Introduction to the DHCP Client
The DHCP client can obtain IP addresses and other configuration parameters
from the DHCP server automatically. The DHCP client brings the following
advantages:
Save device configuration and deployment time.
Reduce the possibility of configuration errors.
Centrally manage IP address assignment.
The DHCP Client are supported on the Ethernet interface, FR,
PPP, HDLC interfaces.
Introduction to the DHCP Relay Agent
The DHCP relay agent forwards DHCP packets between the DHCP server and
the DHCP clients. When the DHCP clients and the server are not located in the
same subnet, a DHCP relay agent must be available for forwarding the DHCP
request and response messages. Data forwarding by the DHCP relay agent is
different from general forwarding. In general forwarding, IP packets are
unaltered and the transmission is transparent. However, upon receiving a
DHCP message, the DHCP relay agent regenerates and forwards a DHCP
message.
From the perspective of the DHCP client, the DHCP relay agent works like a
DHCP server. From the perspective of the DHCP server, the DHCP relay agent
works like a DHCP client.
Configuring DHCP
Enabling the DHCP Server and the DHCP Relay Agent
To enable the DHCP server and the DHCP relay agent, execute the following
commands in the global configuration mode:
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