Enterasys Enterasys Matrix DFE-Gold Series Guía de usuario Pagina 109

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OSPF Overview
Matrix DFE Series and N-SA User’s Guide 8-3
Link-State Advertisements (LSAs)
UsingOSPF,theMatrixDFEPlatinumSeriessystemfloodslinkstateadvertisement(LSA)
packetstokeepitstopologicaldatabaseupdated,andtohelpensurethedatabasesofitsneighbors
arealsocurrent.
Typesof LSAs,eachrelatingtoaparticularpartoftheOSPFroutingdomain,areasfollows.
Routerlink
advertisementsaresentbyeachDFESeriessystemconfiguredwithOSPFtodescribe
therouterslinkswithinthearea.Therouterfloodstheseadvertisementswithinthesinglearea
only.
Networklinkadvertisementsdescribealltheroutingsystemsthatareattachedtothenetwork.
Theadvertisementsarefloodedwithinasinglearea
only.Theyaregeneratedbythedesignated
router.
Summarylinkadvertisementsdescribethe routesinotherOSPFareasthattheDFESeriessystem
knowsabout.TheDFESeriessystemmustbeconfiguredasanareaborderrouter(ABR)to
performthistypeofflooding.Theseadvertisementsarefloodedtotheareas
thatusetheroutes.
TheareasmustbewithinthesameAS.
ASexternallinkadvertisementsdescribeexternalroutesthattheDFESeriessystemknows
about.TheDFESeriessystemmustbeconfiguredasanASboundaryrouter(ASBR)tofloodthis
typeofadvertisement.Theseadvertisementsarefloodedthroughoutthe
AS,excepttostubareas.
TheDFESeries/NSAsystemsupportsopaqueType7LSAsfornotsostubbyareas(NSSAs).
Matrix DFE Series and N-SA Operation in OSPF Networks
EachroutingsystemwithinanOSPFASmaintainsadatabaseofthenetworktopology.Toreduce
thesizeofthedatabase,anASistypicallydividedintosmallerroutingareas,andtherouting
systemsperformdifferentroleswithintheAS.YoucanconfiguretheMatrixDFEPlatinumSeries
systemtoperform
anyofthethreeroutingroleswithinanOSPFautonomoussystem:internal
router,areaborderrouter(ABR),orASboundaryrouter(ASBR).
Figure 81showsasampleOSPFtopology,withthedifferenttypesofrouters.
InternalrouterSystemswithinaspecificareaarecalledinternalrouters.WhentheTN250G
functions
asaninternalrouter,allinterfacesaredirectlyconnectedtootherrouterswithinthe
samearea.
AreaborderrouterAsanABR,theDFESeriessystemcanbelongtomultipleareas.Inthisrole,
theroutermaintainsaseparatetopologydatabaseforeachareainwhichitisamember.
TheDFE
Seriessystem’sABRsupportincludesroutesummarization,whichenablestheroutertoadvertise
aroutethatconsolidatesmultipleadvertisedaddresses.TheDFESeriessystemalsosupports
virtuallinks,enablingconnectiontoabackbonewithoutaphysicalconnection.Stubareasupport
includestheabilitytopreventABRsfromsendingsummary
linkstateadvertisementsintothe
stubarea.
IftheDFESeriessystemhasmorethanoneareaconfigured,andatleastoneisthebackbone,the
routerautomaticallyisanABR.
ASboundaryrouterTheDFESeriessystemcanalsobeconfiguredasanASBR.Inthisrole,the
router
exchangesexternallylearnedroutinginformationwithotherroutersthroughouttheAS.As
anASBR,therouterprovidesrouteredistribution,aswellasrouteaggregationtohelpreducethe
amountofroutinginformationinthenetwork.Theimportingandexportingofroutingpoliciesis
alsoafunctionofASBRs.ASBRsarecreated
whenyouconfigurerouteredistribution.
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