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D-Link DWS-4026 [276/741] Managing the bootp dhcp relay agent

ConfiguringL3Features

D-Link UnifiedWiredandWirelessAccessSystem

November2011 Page276

D‐LinkUWSUserManual

Section5:ConfiguringL3Features

TheD‐LinkUnifiedSwitchsupportsIProuting.UsethepagesintheLAN>L3Featuresnavigationtreefolderto

manageroutingonthesystem.Thissectioncontainsthefollowinginformation:

• “ManagingtheBOOTP/DHCPRelayAgent”

• “ConfiguringtheIPHelperFeatures”

• “ConfiguringARP”

• “ConfiguringGlobalandInterfaceIPSettings”

• “ConfiguringRIP

”

• “RouterDiscovery”

• “Router”

• “VLANRouting”

• “V irtualRouterRedundancyProtocol(VRRP)”

• “ConfiguringQualityofService”

Whenapacketenterstheswitch,thedestinationMACaddressischeckedtoseeifitmatchesanyofthe

configuredroutinginterfaces.Ifitdoes,thenthesiliconsearchesthehosttableforamatchingde

stinationIP

address.Ifanentryisfound,thenthepacketisroutedtothehost.Ifthereisnotamatchingentry,thenthe

switchperformsalongestprefixmatchonthedestinationIPaddress.Ifanentryisfound,thenthepacketis

routedtothenexthop.Ifther

eisnomatch,thenthepacketisroutedtothenexthopspecifiedinthedef ault

route.Ifthereisnodefaultrouteconfigured,thenthepacketispassedtotheCPUtobehandledappropriately.

Theroutingtablecanhaveentriesaddedeitherstaticallybytheadministratorordynamicallyviaar

outing

protocol.ThehosttablecanhaveentriesaddedeitherstaticallybytheadministratorordynamicallyviaARP.

ManagingtheBOOTP/DHCPRelayAgent

TheBootP/DHCPRelayAgentenablesBootP/DHCPclientsandserverstoexchangeBootP/DHCPmessages

acrossdifferentsubnets.Therelayagentreceivestherequestsfromtheclients,andchecksthevalidhopsand

giaddrfields.Ifthenumberofhopsisgreaterthantheconfigured,theagentassumesthepackethaslooped

throughtheagentsan

ddiscardsthepacket.IfgiaddrfieldiszerotheagentmustfillinthisfieldwiththeIP

addressoftheinterfaceonwhichtherequestwasreceived.Theagentunicaststhevalidpacketstothenext

configureddestination.TheserverrespondswithaunicastBOOTREPLYaddressedtother

elayagentclosestto

theclientasindicatedbygiaddrfield.UponreceptionoftheBOOTREPLYfromtheserver,theagentforwards

thisreplyasbroadcastorunicastontheinterfacethathadreceivedtheBOOTREQUEST.Thisinterfacecanbe

identifiedbygiaddrfield.

TheDWS‐4000Seriesswitchalsosupport

sDHCPrelayagentoptionstoidentifythesourcecircuitwhen

customersareconnectedtotheInternetwithhigh‐speedmodem.Therelayagentinsertstheseoptionswhen

forwardingtherequesttotheserverandremovesthemwhensendingthereplytotheclients.

IfaninterfacehasmorethanoneIPa

ddre ss,therelayagentshouldusetheprimaryIPaddressconfiguredas

itsrelayagentIPaddress.

D-Link DWS-4026 [276/741] Managing the bootp dhcp relay agent

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