H3C Technologies H3C WX6000 Series Access Controllers - Manual (Page 381)

36-1
36
DHCP Relay Agent Configuration
When configuring the DHCP relay agent, go to these sections for information you are interested in:
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Introduction to DHCP Relay Agent
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Configuration Task List
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Configuring the DHCP Relay Agent
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Displaying and Maintaining DHCP Relay Agent Configuration
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DHCP Relay Agent Configuration Example
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Troubleshooting DHCP Relay Agent Configuration
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The DHCP relay agent configuration is supported only VLAN interfaces.
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DHCP Snooping must be disabled on the 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. It 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
Figure 36-1 shows a typical application of the DHCP relay agent.