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Configuration Guide - IP Service

CloudEngine 12800 and 12800E V200R005C00

This document describes the configurations of IP Service, including IP address, ARP, DHCP, DNS, IP performance optimization, IPv6, DHCPv6, and IPv6 DNS.

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Introduction to DHCP

Introduction to DHCP

DHCP uses the client/server model. A DHCP client sends a packet to a DHCP server to request configuration parameters such as the IP address, subnet mask, and default gateway address. The DHCP server responds with a packet carrying the requested configurations based on a policy.

DHCP Architecture

Figure 3-1 shows the DHCP architecture.

Figure 3-1 DHCP architecture

The following roles are involved on a typical DHCP network:

  • DHCP client:

    exchanges messages with a DHCP server to obtain an IP address and other configuration parameters. An interface of a device can function as a DHCP client to dynamically obtain configuration parameters such as an IP address from a DHCP server. This facilitates configurations and centralized management.

  • (Optional) DHCP relay agent:

    forwards DHCP messages exchanged between a DHCP client and a DHCP server that are located on different network segments so that they can complete their address configuration. A DHCP relay agent eliminates the need for deploying a DHCP server on each network segment. This feature reduces network deployment costs and facilitates device management.

    In the DHCP architecture, a DHCP relay agent is required only when the server and clients are located on different network segments.

  • DHCP server:

    processes requests of address allocation, address lease extending, and address releasing from DHCP clients or DHCP relay agents, and allocates IP addresses and other network configuration parameters to the DHCP clients.

Currently, CE series switches can only function as DHCP relay agents and DHCP servers.

Updated: 2019-04-18

Document ID: EDOC1100039535

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