Configuring dhcp relay agent, Introduction to dhcp relay agent, Application environment – H3C Technologies H3C SecPath F1000-E User Manual
Page 210: Fundamentals
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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 for ease of centralized management and cost reduction.
Fundamentals
shows a typical application of the DHCP relay agent.
Figure 105 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 "DHCP overview"). The following describes the forwarding process on the DHCP relay
agent.
- H3C SecPath F5000-A5 Firewall H3C SecPath F1000-A-EI H3C SecPath F1000-E-SI H3C SecPath F1000-S-AI H3C SecPath F5000-S Firewall H3C SecPath F5000-C Firewall H3C SecPath F100-C-SI H3C SecPath F1000-C-SI H3C SecPath F100-A-SI H3C SecBlade FW Cards H3C SecBlade FW Enhanced Cards H3C SecPath U200-A U200-M U200-S H3C SecPath U200-CA U200-CM U200-CS H3C SecBlade LB Cards H3C SecPath L1000-A Load Balancer