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CX11x, CX31x, CX710 (Earlier Than V6.03), and CX91x Series Switch Modules V100R001C10 Configuration Guide 13

The documents describe the configuration of various services supported by the CX11x&CX31x&CX91x series switch modules The description covers configuration examples and function configurations.

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This section describes the applicable scenario of DHCP.

DHCP Server Application

As it is shown in Figure 6-31, a DHCP server and multiple DHCP clients (such as PCs and portable computers) are deployed.

Figure 6-31 Typical networking of the DHCP server

Generally, the DHCP server is used to assign IP addresses in the following scenarios:

  • On a large network, manual configurations take a long time and bring difficulties to centralized management over the entire network.

  • Hosts on the network are more than available IP addresses. Thus, not every host has a fixed IP address. Many hosts need to dynamically obtain IP addresses through the DHCP server. In addition, network administrators hope that there is a limit to the number of users of on-line at the same time.

  • Only a few hosts on the network require fixed IP addresses.

DHCP Relay Application

Figure 6-32 shows typical networking of DHCP relay.

Figure 6-32 Typical networking of DHCP relay

The earlier DHCP protocol applies to only the scenario that the DHCP client and DHCP server are on the same network segment. To dynamically assign IP addresses to hosts on network segments, the network administrator needs to configure a DHCP server on each network segment, which increases costs.

The DHCP relay function is introduced to solve this problem. A DHCP client can apply to the DHCP server on another network segment to obtain a valid IP address. In this manner, DHCP clients on multiple network segments can share one DHCP server. This reduces costs and facilitates centralized management.

Updated: 2019-12-13

Document ID: EDOC1000041694

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