Configuration Guide Configuring DHCPConfiguring DHCP
4.3 Features
Basic Concepts
 DHCP Server
Based on the RFC 2131, Ruijie DHCP server assigns IP addresses to clients and manages these IP addresses.
 DHCP Client
DHCP Client enables a device to automatically obtain an IP address and configurations from a DHCP server.
 DHCP Relay
When a DHCP client and a DHCP server are not in a same subnet, they need a DHCP relay to forward DHCP request and
reply packets.
 Lease
Lease is a period of time specified by a DHCP server for a client to use an assigned IP address. An IP address is active
when leased to a client. Before a lease expires, a client needs to renew the lease through a server. When a lease expires
or is deleted from a server, the lease becomes inactive.
 Excluded Address
An excluded address is a specified IP address not assigned to a client by a DHCP server.
 Address Pool
An address pool is a collection of IP addresses that a DHCP server may assign to clients.
 Option Type
An option type is a parameter specified by a DHCP server when it provides lease service to a DHCP client. For example, a
public option include the IP addresses of a default gateway (router), WINS server and a DNS server. DHCP server allows
configuration of other options. Though most options are defined in the RFC 2132, you can add user-defined options.
Overview
Enable DHCP Server on a device, and it may assign IP addresses dynamically and pushes
configurations to DHCP clients.
Enable DHCP Relay on a device, and it may forward DHCP request and reply packets
across different network segments.
Enable DHCP Client on a device, and it may obtain IP addresses and configurations
automatically from a DHCP server.
Plan IP range requested by DHCP clients from different vlan+port/vlan
4.3.1 DHCP Server
Working Principle
 DHCP Working Principle
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