No relevant resource is found in the selected language.

This site uses cookies. By continuing to browse the site you are agreeing to our use of cookies. Read our privacy policy>Search


To have a better experience, please upgrade your IE browser.

Configuration Guide - IP Service
S1720, S2700, S5700, and S6720 V200R011C10

This document describes the configurations of IP Service, including IP address, ARP, DHCP, DHCP policy VLAN, DNS, mDNS gateway, mDNS relay, UDP Helper, IP performance optimization, IPv6, DHCPv6, IPv6 DNS, IPv6 over IPv4 tunnel, and IPv4 over IPv6 tunnel.

Rate and give feedback:
Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
Network Elements in DHCP

Network Elements in DHCP

A client-server model forms the basis of DHCP and consists of two roles that a Huawei switch can fulfill: DHCP server and DHCP client. When the DHCP server and client are on different network segments, there is a DHCP relay agent between them. Figure 4-1 shows the typical DHCP networking.

Figure 4-1  DHCP networking

The following describes the three roles involved in DHCP:

  • DHCP server

    A DHCP server assigns IP addresses from specified address pools to DHCP clients. It can also manage these clients and provide network parameters such as the default gateway address, Domain Name System (DNS) server address, and Windows Internet Name Service (WINS) server address. A DHCP server can accept broadcasts from locally attached LAN segments or DHCP requests forwarded by DHCP relay agents within the network.

  • DHCP client

    A client can use BOOTP or DHCP to obtain its IP address and other network parameters from a DHCP server. To obtain an IP address, the client sends a BOOTP or DHCP Request message. DHCP clients can be IP phones, PCs, mobile devices, diskless workstations, or other networked devices, and can be connected directly or through other networks using DHCP relay agents.

  • DHCP relay agent

    DHCP relay agent forwards DHCP messages between a DHCP server and DHCP clients and helps the DHCP server to dynamically allocate network parameters to the DHCP clients.

    When a DHCP client broadcasts DHCP Discovery messages with the destination IP address, only the DHCP server on the same network segment as the DHCP client can receive the messages. If a DHCP server is on a different network segment from the DHCP client, a DHCP relay agent must be deployed to forward DHCP Discovery messages to the DHCP server. The DHCP relay agent modifies the format of a DHCP Discovery or Offer message to generate a new DHCP message and then forwards it.

Updated: 2020-02-26

Document ID: EDOC1000178170

Views: 270544

Downloads: 1025

Average rating:
This Document Applies to these Products

Related Version

Related Documents

Previous Next