Enterasys Networks D2G124-12P Manual

A SERVICE OF

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D-Series CLI Reference 14-1

14

DHCP Server Configuration

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

Series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D‐Series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D‐Series

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

•NetBIOSWINSserver(s)

andnodename

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

DHCP Overview 14-1

Configuring General DHCP Server Parameters 14-3

Configuring IP Address Pools 14-10