Enterasys Enterasys Matrix DFE-Gold Series User's Guide Page 111

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OSPF Overview
Matrix DFE Series and N-SA User’s Guide 8-5
thatfallwithinthespecifiedrangesarenotadvertisedintootherareasasinterarearoutes.
Instead,thespecifiedrangesareadvertisedassummarynetworkLSAs.
MatrixDFESeriesandNSAdevicesallowconfigurationofvariousOSPFareaparameters,
includingstubareas,defaultcost,authenticationmethod,andnotsostubbyareas(NSSAs).
InformationaboutrouteswhichareexternaltotheOSPFroutingdomainisnotsentintoastub
area.Instead,thereisadefaultexternal
routegeneratedbytheABRintothestubareafor
destinationsoutsidetheOSPFroutingdomain.
Stubcostspecifiesthecosttobeusedtoinjectadefaultrouteintoastubarea.Anauthentication
methodforOSPFpacketscanbespecifiedonaperareabasis.
Static Multipath Forwarding
TheMatrixDFEPlatinumSeriessystemsupportsOSPFandstaticmultipath.Ifmultiple,equal
costOSPForstaticrouteshavebeendefinedforanydestination,thentheDFESeriessystem
“discovers”andusesallofthem.ThesystemwillautomaticallylearnuptofourequalcostOSPF
orstaticroutes
andretaintheminitsForwa rdingInformationBase(FIB).Theforwardingmodule
theninstallsflowsforthesedestinationsinaroundrobinfashion,orhashbasedalgorithm.
Designating an OSPF Instance
OSPFisenabledbycreatinganOSPFinstance,whichisdesignatedbyanidentificationnumber
from1to65535.
Onceaninstanceiscreated,allthe routers OSPFsettingsareconfiguredwithrespecttothe
instanceID.
Virtual Links
InOSPF,virtuallinkscanbeestablished:
•Toconnectanareaviaatransitareatothe backbone
•Tocreatearedundantbackboneconnectionthroughanotherarea
EachAreaBorderRoutermustbeconfiguredwiththesamevirtuallink.Notethatvirtuallinks
cannotbeconfiguredthroughastubarea.
Note: Although this does not apply to most changes to OSPF and other routing-based entries in
the configuration file, the following actions force the OSPF Link State Databases (LSDB) to re-
initialize:
Adding a network to or removing one from an area.
Changing an area’s type.
Adding a summary range to or removing one from an Area Border Router.
Note: Only one OSPF instance is allowed per Matrix DFE Series routing module or N-SA device.
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