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DHCP Overview
DHCP Architecture
Figure 4-1 shows the DHCP architecture.
DHCP involves the following roles:
- DHCP client
A DHCP client exchanges messages with a DHCP server to obtain an IP address and other configuration parameters. A device interface can function as a DHCP client to dynamically obtain configuration parameters from a DHCP server. This facilitates configuration and centralized management.
- DHCP relay agent
A DHCP relay agent forwards DHCP messages exchanged between a DHCP client and a DHCP server that are located on different network segments, allowing them to complete their address configuration. The use of a DHCP relay agent eliminates the need for deploying a DHCP server on each network segment. This reduces network deployment costs and facilitates device management.
NOTE:
DHCP relay agents are not mandatory in the DHCP architecture. A DHCP relay agent is required only when the server and client are located on different network segments. - DHCP serverA DHCP server processes address allocation, lease extension, and address release requests originating from a DHCP client or forwarded by a DHCP relay agent and assigns IP addresses and other configuration parameters to the client.
NOTE:
To protect a DHCP server against network attacks, such as man-in-the-middle attacks, starvation attacks, and DoS attacks by changing the CHADDR value, configure DHCP snooping on the intermediate device directly connecting to a DHCP client to provide DHCP security services.
