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Enterasys D-Series CLI Reference 16-1
16
DHCP Server Configuration
ThischapterdescribesthecommandstoconfiguretheIPv4DHCPserverfunctionalityonaD
Seriesswitch.
DHCP Overview
DynamicHostConfigurationProtocol(DHCP)forIPv4isanetworklayerprotocolthat
implementsautomaticormanualassignmentofIPaddressesandotherconfigurationinformation
toclientdevicesbyservers.ADHCPservermanagesauserconfiguredpoolofIPaddressesfrom
whichitcanmakeassignmentsuponclientrequests.A
relayagentpassesDHCPmessages
betweenclientsandserverswhichareondifferentphysicalsubnets.
DHCP Server
DHCPserverfunctionalityallowstheDSeriesswitchtoprovidebasicIPconfiguration
informationtoaclientonthenetworkwhorequestssuchinformationusingtheDHCPprotocol.
DHCPprovidesthefollowingmechanismsforIPaddressallocationbyaDHCPserver:
Automatic—DHCPserverassignsanIPaddresstoaclientfor
alimitedperiodoftime(or
untiltheclientexplicitlyrelinquishestheaddress)fromadefinedpoolofIPaddresses
configuredontheserver.
•ManualAclient’sIPaddressisassignedbythenetworkadministrator,andDHCPisused
simplytoconveytheassignedaddresstotheclient.Thisismanagedby
meansof“static”
addresspoolsconfiguredontheserver.
TheamountoftimethataparticularIPaddressisvalidforasystemiscalledalease.TheDSeries
maintainsaleasedatabasewhichcontainsinformationabouteachassignedIP address,theMAC
addresstowhichitisassigned,the
leaseexpiration,andwhethertheaddressassignmentis
dynamic(automatic)orstatic(manual).TheDHCPleasedatabaseisstoredinflashmemory.
InadditiontoassigningIPaddresses,theDHCPservercanalsobeconfiguredtoassignthe
followingtorequestingclients:
•Defaultrouter(s)
•DNSserver(s)anddomainname
•NetBIOSWINSserver(s)
andnodename
For information about... Refer to page...
DHCP Overview 16-1
Configuring General DHCP Server Parameters 16-3
Configuring IP Address Pools 16-11
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