Qtech QSW-3200-28T [54/136] Brief introduction

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Chapter 6 DHCP CONFIGURATION

6.1 Brief introduction

DHCP packet is broadcasting packet so in layer 3 network structure and using DHCP to

distribute IP address, each broadcasting domain needs a DHCP server. For layer 3 network

structure by using QTECH QSW-3200 to establish a layer 3 network, each VLAN needs a

DHCP server which greatly wastes of resources. A better way to solve this problem is to

configure DHCP relay in QTECH QSW-3200 to relay DHCP packet to DHCP server which can

need at least only one DHCP server.

Following DHCP functions are supported:

 Support DHCP relay function

 Support specifying DHCP server for each vlan

 Support built-in DHCP server

 Support DHCP client to obtain system IP

6.2 DHCP configuration

6.2.1 DHCP configuration list

DHCP configuration list is as following:

 Enable DHCP relay

 Specify DHCP server for vlan

 Display DHCP server configuration

6.2.2 Enable DHCP relay

By default, DHCP relay is disabled. Enable DHCP relay in global configuration mode:

 Enable DHCP relay

dhcp-relay

 Disable DHCP relay

no dhcp-relay

Display DHCP relay in any configuration mode:

 Display DHCP relay

show dhcp-relay

Example:

! Enable DHCP relay

QTECH(config)#dhcp

! Disable DHCP relay

QTECH(config)#no dhcp

! Display DHCP relay

QTECH(config)#show dhcp-relay

6.2.3 Configre DHCP servers for each VLAN

After creation of VLAN, DHCP servers can be configured for it. Thus DHCP messages of this

VLAN will be relayed to the specified DHCP servers of this VLAN.Two DHCP servers can be

configured for each VLAN.Please use the following commands in VLAN configureation mode: