Switch User Manual

SecureStack C3 Configuration Guide 16-1

DHCP Server Configuration

ThischapterdescribesthecommandstoconfiguretheIPv4DHCPserverfunctionalityona

SecureStackC3switch.

DHCP Overview

DynamicHostConfigurationProtocol(DHCP)forIPv4isanetworklayerprotocolthat

implementsautomaticormanualassignmentofIPaddressesandotherconfigurationinformation

toclientdevicesbyservers.ADHCPservermanagesauser‐configuredpoolofIPaddressesfrom

whichitcanmakeassignmentsuponclientrequests.A

relayagentpassesDHCPmessages

betweenclientsandserverswhichareondifferentphysicalsubnets.

DHCP Relay Agent

TheDHCP/BOOTPrelayagentfunctioncanbeconfiguredonalloftheSecureStackC3’srouting

interfaces.TherelayagentcanforwardaDHCPclient’srequesttoaDHCPserverlocatedona

differentnetworkiftheaddressoftheserverisconfiguredasahelperaddressonthereceiving

interface.The

relayagentinterfacemustbeaVLANwhichisconfiguredwithanIPaddress.Refer

totheiphelper‐addresscommand(“iphelper‐address”onpage 19‐18)formoreinformation.

DHCP Server

DHCPserverfunctionalityallowstheSecureStackC3switchtoprovidebasicIPconfiguration

informationtoaclientonthenetworkwhorequestssuchinformationusingtheDHCPprotocol.

DHCPprovidesthefollowingmechanismsforIPaddressallocationbyaDHCPserver:

• Automatic—DHCPserverassignsanIPaddresstoaclientfor

alimitedperiodoftime(or

untiltheclientexplicitlyrelinquishestheaddress)fromadefinedpoolofIPaddresses

configuredontheserver.

•Manual—Aclient’sIPaddressisassigned bythenetworkadministrator,andDHCPisused

simplytoconveytheassignedaddresstotheclient.Thisismanagedby

meansof“static”

addresspoolsconfiguredontheserver.

TheamountoftimethataparticularIPaddressisvalidforasystemiscalledalease.The

SecureStackC3maintainsaleasedatabasewhichcontainsinformationabouteachassignedIP

For information about... Refer to page...

DHCP Overview 16-1

Configuring General DHCP Server Parameters 16-3

Configuring IP Address Pools 16-12