基于gmpls的波长预留冲突避免恢复算法设计与仿真

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1、东北大学硕士学位论文AbstractDesignandSimulationforWavelengthReservationCollisonAvoidanceRestorationAlgorithmBasedonGMPLSAbstractWiththefurtherdevelopmentsofthetransportnetworktechnology,survivabilityofnetworkhasbecometheimportantissueofdesigningandmaintainingtheAuto

2、maticallySwitchedOpticalNetwork(ASOr,O．ThefasterfaultrecoverybecomesASONcorefunctionalrequirementsandkeyadvantage．ASONcanautomaticallyestablishdynamictrafficconnections，effectivelyconfigurenetworkresourcesandproviderapidprotection／restorationschemebyintrod

3、ucingcontrolplanewithGMPLSprotoc01．Comparedwithprotectionmechanism，restorationdoesn’tneedtopre—allocateresourceanditcansearchthespareresourcedynamically,SOrestorationhasbetterresourcesutilization．Basedonanalyzingthepresentdifferentrestorationstrategiescare

4、fully,thisthesispresentsawavelengthreservationcollisionavoidrestorationalgorithm(WRCA)．Therestorationalgorithmofopticalnetworkistofindalloptimizedrouteandassignaavailablewavelengthafterthefaliure．Attheroutefindingphase，mostpresentalgorithmsonlyconsidersele

5、ctingtheshortestpathsbutnotequalizingthenetworkload．Tosolvethedeficiencies，thisthesisputsforwardanequalizingroutingalgorithmwhichcanmodifytheweightofDijkstraintermsofcontemporarynetworkstatetooptimizetheselectivepathsbyintroducinglinkloadindicatorandlinkut

6、ilizationindicator．Atthewavelengthassignmentphase，thenetworkwithoutwavelengthconverteriseasilyblockedbecauseofthewavelength—continuityconstraint．Inconsiderationofthisfact，WRCAalgorithmispresented．Thisalgorithmisrealizedbyaddingcollisiondetectionobject(CDO)

7、inthePathmessageoftheresourcereservationprotocolwithtrafficengineeringextension(RSVP—TE)．DependingonthevalueoftheCDflag，differentwavelengthselectionstrategiesareappliedatthedestinationnode．Finally,thethesispresentsthesimulationprocessoffourwavelengthassign

8、mentalgorithmswhichemploythesameroutingalgorithmERAonGLASSplatform．TheresultsindicatethatthefirstfitalgorithmandrandomfitalgorithmemployingCDschemecomparedwithconventionalFFandRDcanreducetheblockingprobabilit