Sun-microsystems 1.0 Uživatelský manuál Strana 88
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Hodnocené. / 5. Na základě hodnocení zákazníků
62 SunFDDI/P1.0 AdapterUser’sGuide—May1997
6
Figure 6-10 Dual-Attached Station in Wrap Mode
OpticalBypassSwitches
Station wrapping provides effective network recovery in the event of a single
station or cable failure. However, two or more failures in the ring will isolate
portions of the network, as shown in Figure 6-11.
This limitation can be overcome to a certain extent by fitting optical bypass
switches to the dual-attached stations. As their name suggests, these switches
provide an optical connection that bypasses the station in the event of failure,
or if the station needs to be removed from the ring. Optical bypass switches
can only be used to overcome station faults; they have no affect in the event of
a cable fault.
The attenuation in an optical bypass switch is far greater than in a normal
FDDI connection; therefore, the number of optical bypass switches that can be
connected in series in a single ring is limited.
Dual-attached station
(DAS)
Pout
Data to downstream station
MAC
PHY B
PHY A
Sin
Data from upstream station
port B
port A
Primary and secondary rings
wrapped within the MAC l
- SunFDDI/P 1
- 1.0AdapterUser’sGuide 1
- FCCClassANotice 3
- FCCClassBNotice 3
- Declaration of Conformity 5
- Contents 7
- Contents ix 9
- Contents xi 11
- Contents xiii 13
- HowthisBookisOrganized 19
- UNIXCommands 21
- TypographicConventions 22
- ShellPrompts 22
- RelatedDocuments 23
- OrderingSunDocuments 23
- GettingHelp 24
- SunWelcomesYourComments 24
- SunFDDI/POverview 27
- FDDIConformance 28
- HardwareInstallation 29
- DeviceInstancesandDeviceNames 30
- InstallationItems 30
- ConnectingFiberOpticCables 31
- MIC-to-MICCoupler 33
- CleaningtheFiberOpticCable 33
- HardwareInstallation 9 35
- InstallingSunFDDI/PSoftware 37
- InstallationRequirements 38
- # mkdir /cdrom/sunfddip_1_0 39
- ▼ To Finish the Installation 43
- ▼ To Check the Installation 44
- ▼ Unloading Drivers 45
- ▼ To Use pf_install_agents 46
- RemovingSunFDDI/P 48
- ImprovingNetworkPerformance 49
- HighPerformanceFDDINetworks 50
- RingLatencyImprovement 50
- DataThroughputImprovement 51
- PerformanceAcrossBridges 51
- TargetTokenRotationTime(TTRT) 52
- ImprovingPerformance 53
- ▼ To Tune the Low Water Mark 54
- TuningtheSocketOptions 55
- MTUPathDiscovery 56
- TroubleshootingandDiagnostics 59
- TroubleshootingChecklist 60
- ▼ To Check the IP Addresses 62
- ▼ To Check the IP Routing 63
- ▼ To Check the SMT Traffic 64
- SolvingCommonProblems 65
- SunFDDINetworks 73
- FDDINetworkArchitecture 75
- FDDINetworkModel 76
- Physical(PHY)Layer 77
- MediaAccessControl(MAC)Layer 78
- StationManagement(SMT)Layer 78
- • Gather network statistics 79
- • Generate status reports 79
- FDDIStations 82
- • Dual-attached station (DAS) 82
- Dual-AttachedStation(DAS) 83
- FDDIConcentrators 84
- FDDIFailureRecovery 86
- OpticalBypassSwitches 88
- FDDIRingOperation 91
- FDDIPerformance 92
- • Network load 93
- • Network efficiency 93
- • Bus architecture 93
- FDDINetworkTopologies 95
- BasicDual-RingNetwork 96
- StandaloneConcentrator 98
- ConcentratorswithDual-Homing 100
- TreeofConcentrators 101
- Advantages 102
- RingofTrees 103
- Disadvantages 104
- MixedFDDI/EthernetNetworks 105
- • Route 1 (across FDDI link): 108
- FDDINetworkTopologies 83 109
- UsingtheSunFDDI 111
- NetworkUtilities 111
- <mac_address> 112
- InterpretingLocalStatistics 115
- • MAC availability 116
- • Connection initialization 117
- • Maintenance support 117
- Ring_OP (RingOperational) 118
- XmitP (Transmit Packets) 118
- ExampleLocalStatistics 119
- Phy(PhysicalConnection) 121
- Frame(FramesReceived) 121
- Error(ErrorFrames) 121
- Lost(LostFrames) 122
- SA(StationAddress) 122
- UNA(UpstreamNeighbor Address) 122
- ExampleNeighborStatistics 123
- SMTFrameClassesandTypes 126
- FilteringOutputfrompf_smtmon 127
- ManagingFDDIStations 129
- UsingSunNetManager 129
- # /opt/SUNWconn/bin/snm —i 135
- InterpretingTrapsandErrors 140
- MACAddressFormats 143
- • Canonical format 143
- • Ring format 143
- DevelopingApplicationsthat 145
- RunoverSunFDDI/P 145
- Data link service user 147
- Data link service provider 147
- DLPIAddressing 148
- 0 Not supported 149
- SettingUpServers 151
- % /usr/bin/df -k /export 152
- ▼ To Set Up a Server 153
- ▼ To Update the NIS Server 158
- ▼ To Boot a Diskless Client 159
- FrequentlyAskedQuestionsAbout 161
- Glossary 167
- Glossary 143 169
- Glossary 145 171
- Numerics 173
- Reader Comment Card 181
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