D-Link DWS-4026 [296/741] Loopbacks configuration

LoopbackInterfaces

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

November2011 Page296

D‐LinkUWSUserManual

LoopbackInterfaces

D‐LinkDWS‐4000Seriessoftwareprovidesforthecreation,deletion,andmanagementofloopbackinterfaces.

Theyaredynamicinterfacesthatarecre a tedanddeletedviauser‐configuration.D‐LinkDWS‐4000Series

softwaresupportsmultipleloopbackinterfaces.

Aloopbackinterfaceisalwaysexpectedtobeup.Assuch,itprovidesame

anstoconfigureastableIPaddress

onthedevicethatmaybereferredtobyotherswitches.Thisinterfaceprovidesthesourceaddressforsent

packetsandcanreceivebothlocalandremotepackets.Itistypicallyusedbyroutingprotocols.

Aloopbackinterfaceisapseudo‐deviceforassigninglo

caladdressessothattheroutercanbecommunicated

withbythisaddress,whichisalwaysupandcanreceivetrafficfromanyoftheexistingactiveinterfaces.Thus,

givenreachabilityfromaremoteclient,theaddressoftheloopbackcanbeusedtocommunicatewiththe

routerthroughvariousser

vicessuchastelnetandSSH.Inthisway,theaddressonaloopbackbehaves

identicallytoanyofthelocaladdressesoftherouterintermsoftheprocessingofincomingpackets.

LoopbacksConfiguration

UsetheLoopbacksConfigurationpagetocreate,configure,orremoveloopbackinterfaces.Youcanalsosetup

ordeleteasecondaryaddressforaloopback.

Todisplaythepage,clickLAN>L3Features>Loopbacks>Configurationinthenavigationtree.Ifnoloopback

interfacesexistonthesystem,thepageonlyha

stwofields,asFigure191shows.

Figure191:LoopbackConfiguration—Create

Additionalfieldsdisplaydependingonwhetherornotaloopbackhasalreadybeencreated,asshownin

Figure192.

Figure192:ConfiguredLoopbackInterface