简介:Inthispaper,weproposeanewbackup-VPpriorityrestorationmethodforATMsurvivalnet-works,inordertoimprovethesurvivabilityperformanceofhigherpriorityVPsincaseofmulti-failureundertheminimumamountofsparecapacityrequired.Thismethodisapartofahybridrestorationmechanism(tobepresentedlater),whichintegratesabackup-VPmethod^[2]andadistributedfloodingalgorithm^[3]intheATMlayer.ThismethodisapathrestorationbetweenVPterminalnodes,completestherestorationwithbi-directionalmessagetransmissionbyusingpre-assignedbackupVPsincaseofsinglefailure,andimprovestherestorationtimeofhigherpriorityVPsincaseofmulti-failure,butitshouldcooperatewithanotherorganicpartofthehybridrestorationmechanism-afloodingalgorithmtorestoretheremaininglowerpriorityVPs.Thismethodcanuseresourcemoreefficientlyandobtainabettercost-performancefeature.