Configuring Dhcp Relay Agent; Introduction To Dhcp Relay Agent; Application Environment; Fundamentals - HP 1910 User Manual

Configuring DHCP relay agent

Introduction to DHCP relay agent

Application environment

Since DHCP clients request IP addresses via broadcast messages, the DHCP server and clients must be
on the same subnet. Therefore, a DHCP server must be available on each subnet, which is not practical.
DHCP relay agent solves the problem. Via a relay agent, DHCP clients communicate with a DHCP server
on another subnet to obtain configuration parameters. Thus, DHCP clients on different subnets can
contact the same DHCP server, and centralized management and cost reduction are achieved.

Fundamentals

Figure 284 DHCP relay agent application
No matter whether a relay agent exists or not, the DHCP server and client interact with each other in a
similar way (see
agent. For more information about DHCP packet exchange, see
process."
"DHCP overview"). The following describes the forwarding process on the DHCP relay
275
"Dynamic IP address allocation