路由知识讲解.ppt

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1、路由RoutingOverviewFabricRoutingislogicusedbyaswitchtopassframesfromthesourcedomaintowardthedestinationdomainFC-FCRoutingisperformedbyaFibreChannelrouter,topassframesfromasourcedeviceinonefabrictowardadestinationdeviceinanotherfabricwithoutmergingthefabricsThismodulefocusesonFabricShortestPa

2、thFirst(FSPF)routingThereisaweb-basedtrainingmoduleonFC-FCrouting*SANBSANAFabricRoutingFC-FCRoutingFabricTerminologyInter-switchLinks(ISLs)E_Port-to-E_PortlinksCommunicatesusingClassFserviceWillbesegmentediflinkparametersareincompatiblePrincipalSwitchSelectedwhenthefabricinitializes,before

3、routingisestablishedManagestheassignmentofuniquedomainIDsProvidestimesynchronizationtoallotherswitchesinthefabricPrincipalISLISLusedtocommunicatebetweenthePrincipalSwitchandotherswitchesinthefabricRoutingTerminologyOver-subscriptionThepossiblecontentionforbandwidthbydevicesthroughanISLCong

4、estionTheactualcontentionforbandwidthbydevicesthroughanISLISLover-subscriptionratioByportcountEasiertocalculate,lessaccurate(#ofDeviceports)tothe(#ofE_Ports)expressedas15:1,7:1,3:1BybandwidthMoredifficulttocalculate,moreaccurate(SumofHBAbandwidths)tothe(SumofISLbandwidths)expressedas7:1,3:

5、1LocalityReducingtransmissionlatencybyphysicallyplacinghostsandstoragethatcommunicatefrequentlysuchthatnorouting(sameswitch)orminimalrouting(adjacentswitches)isrequiredEasiertomanageinsmallSANsthanlargeorgrowingSANsEasiertomanageinDirectorsEightVirtualChannels(queues)areusedperISLUsedtosol

6、vetrafficcongestionbyinterleavingframesVC0–ClassF:LinkControlFramesVC1–ClassTwo:ACKSandF_RJT(Framereject),LinkControlVC2thruVC5–DataFramesVC6–MulticastTrafficVC7–BroadcastTrafficOriginalVirtualChannels(Pre-Condor2/GoldenEye2)SwitchPortVC0VC1VC2VC3VC4VC5VC6VC7ISLSwitchPortSwitchPortVC0VC1VC

7、2VC3VC4VC5VC6VC78Gbit/secSwitchandDirectorVirtualChannelModel(Condor2/GoldenEye2based)VC#Assignedto%Bandwidth0ClassF1Class2acks2MediumPriorityQoS30%3MediumPriorityQoS4MediumPriorityQoS5MediumPriorityQoS6Class3Multicast7Broadcast/Multicast8LowPriorityQoS10%9Lo