Specifications

SecureStack B2 Configuration Guide 17-1

DHCP Server Configuration

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

SecureStackB2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 Server

DHCPserverfunctionalityallowstheSecureStackB2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B2maintainsaleasedatabasewhichcontainsinformationabouteachassignedIP

address,theMACaddresstowhichitisassigned,the

leaseexpiration,andwhethertheaddress

assignmentisdynamic(automatic)orstatic(manual).TheDHCPleasedatabaseisstoredinflash

memory.

InadditiontoassigningIPaddresses,theDHCPservercanalsobeconfiguredtoassignthe

followingtorequestingclients:

•Defaultrouter(s)

•DNSserver(s)anddomainname

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

DHCP Overview 17-1

Configuring General DHCP Server Parameters 17-3

Configuring IP Address Pools 17-11