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1、OSPFUpdatePacket-PacingConfigurableTimersFeatureHistoryReleaseModification12.2(4)TThisfeaturewasintroduced.12.2(4)T3SupportfortheCisco7500serieswasaddedinCiscoIOSRelease12.2(4)T3.12.2(8)TSupportfortheCisco1710,3631,3725,3745,andURMwasaddedinCiscoIOSRe
2、lease12.2(8)T.12.2(8)T1SupportfortheCisco2691wasaddedinCiscoIOSRelease12.2(8)T1.ThisfeaturemoduledescribestheOSPFUpdatePacket-PacingConfigurableTimersfeature.Itincludesthefollowingsections:•FeatureOverview,page1•Benefits,page2•RelatedFeaturesandTechno
3、logies,page2•SupportedPlatforms,page2•SupportedStandards,MIBs,andRFCs,page3•ConfigurationTasks,page4•MonitoringandMaintainingOSPFPacket-PacingTimers,page6•ConfigurationExamples,page6•CommandReference,page7FeatureOverviewInraresituations,youmightneedto
4、changeOpenShortestPathFirst(OSPF)packet-pacingdefaulttimerstomitigateCPUorbufferutilizationissuesassociatedwithfloodingverylargenumbersoflink-stateadvertisements(LSAs).TheOSPFUpdatePacket-PacingConfigurableTimersfeatureallowsyoutoconfiguretherateatwhi
5、chOSPFLSAfloodpacing,retransmissionpacing,andgrouppacingupdatesoccur.CiscoIOSRelease12.2(4)T31OSPFUpdatePacket-PacingConfigurableTimersSupportedPlatformsConfiguringOSPFfloodpacingtimersallowsyoutocontrolinterpacketspacingbetweenconsecutivelink-stateup
6、datepacketsintheOSPFtransmissionqueue.ConfiguringOSPFretransmissionpacingtimersallowsyoutocontrolinterpacketspacingbetweenconsecutivelink-stateupdatepacketsintheOSPFretransmissionqueue.CiscoIOSsoftwaregroupstheperiodicrefreshofLSAstoimprovetheLSApacki
7、ngdensityfortherefreshesinlargetopologies.ThegrouptimercontrolstheintervalusedforgroupLSArefreshment;however,thistimerdoesnotchangethefrequencythatindividualLSAsarerefreshed(thedefaultrefreshoccursevery30minutes).NoteThedefaultsettingsforOSPFpacketpac
8、ingtimersaresuitableforthemajorityofOSPFdeployments.Youshouldchangethedefaulttimersonlyasalastresort.BenefitsTheOSPFUpdatePacket-PacingConfigurableTimersfeatureprovidestheadministratorwithamechanismtocontroltherateatwhichLSAupdatesoccurinorder
