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Nortel Networks 450 manual Possible Problems with VLANs and Spanning Tree Protocol

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BayStack 450 10/100/1000 Series Switches

To connect multiple VLANs across switches with redundant links, you must disable the STP on all participating switch ports. Figure 1-23 shows possible consequences of enabling the STP when using VLANs between untagged (non-802.1Q tagged) switches.

Station A

VLAN 1

No

CommunicationsForwarding

VLAN 1

Station B

Non-802.1Q tagged switch

S1

VLAN 2

Blocking

Non-802.1Q tagged switch

S2

VLAN 2

BS45017A

Figure 1-23. Possible Problems with VLANs and Spanning Tree Protocol

As shown in Figure 1-23, with STP enabled, only one connection between S1 and S2 is forwarding at any time. Communications failure occurs between VLAN 2 of S1 and VLAN 2 of S2, blocking communications between Stations A and B.

The STP selects the link connecting VLAN 1 on Switches S1 and S2 as the forwarding link based on port speed, duplex-mode, and port priority. Because the other link connecting VLAN 2 is in Blocking mode, stations on VLAN 2 in switch S1 cannot communicate with stations in VLAN 2 on switch S2. With multiple links only one link will be forwarding.

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Nortel Networks 450 manual Possible Problems with VLANs and Spanning Tree Protocol

Contents

Using the BayStack 450 10/100/1000 Series Switch Trademarks Copyright 1999 Nortel NetworksStatement of Conditions USA Requirements OnlyTaiwan Requirements Japan/Nippon Requirements OnlyCanada Requirements Only EC Declaration of ConformityNortel Networks NA Inc. Software License Agreement Rev Page Contents Viii Chapter Installing the BayStack 450 Switch Chapter Using the Console Interface Chapter Troubleshooting Appendix B Gigabit Fiber Optical Characteristics MDI-X to MDI-X Cable Connections Page Figures Xvi Switch Configuration Menu Screen 36. Sample Event Log Entry Showing Excessive Bad Entries Tables Table B-1 Audience PrefaceIf you want to Go to OrganizationAcronyms Text ConventionsRelated Publications Technical Solutions Center Telephone Number How to Get HelpPage Physical Description BayStack 450 Switch VersionsFront Panel BayStack 450 Switch Front PanelsUplink/Expansion Slot Port ConnectorsComm Port 100BASE-FX MT-RJ Ports BayStack 450-24T/12T LED Display Panel LED Display PanelLabel Type Color State Meaning BayStack 450-12F SwitchBayStack 450 Switch LED Descriptions Back Panel Country/Plug description Specifications Typical plug AC Power ReceptacleInternational Power Cord Specifications Rpsu Connector Cooling Fans FeaturesCascade Module Slot Using the BayStack 450 10/100/1000 Series Switch Telnet Ieee 802.1Q VLANs Ieee 802.1p PrioritizingStorage of Switch Software Image Igmp Snooping FeatureStorage of Configuration Parameters Flash Memory StorageAutosensing and Autonegotiation MultiLink TrunkingPort Mirroring Stack software offset is Then the Stack MAC address becomes BootP Automatic IP Configuration/MAC AddressSnmp MIB Support Network ConfigurationConfiguration and Switch Management BayStack 450 Switch Used as a Desktop Switch Desktop Switch ApplicationBayStack 450 Switch Used as a Segment Switch Segment Switch ApplicationConfiguring Power Workgroups and a Shared Media Hub High-Density Switched Workgroup ApplicationFail-Safe Stack Example Fail-Safe Stack ApplicationBayStack 400-ST1 Cascade Module Stack OperationCascade a In Connector Cascade a Out ConnectorUnit Select Switch Base Unit Initial InstallationTemporary Base Unit Stack MAC AddressRemoving a Unit from the Stack Stack ConfigurationsStack Down Configurations Stack Up Configurations13. Stack Down Configuration Example Redundant Cascade Stacking Feature 14. Redundant Cascade Stacking Feature 15. Port-Based Vlan Example Ieee 802.1Q Vlan WorkgroupsIeee 802.1Q Tagging 16. Default Vlan Settings 17 .1Q Tagging 1 19 .1Q Tagging 3 Vlans Spanning Multiple 802.1Q Tagged Switches VLANs Spanning Multiple Switches22. VLANs Spanning Multiple Untagged Switches Vlans Spanning Multiple Untagged Switches23. Possible Problems with VLANs and Spanning Tree Protocol 24. Multiple VLANs Sharing Resources Shared Servers25. Vlan Broadcast Domains Within the Switch Default Vlan Configuration screen opens Figure To configure the Vlan port membership for Vlan27. Vlan Configuration Screen Example To configure the Pvid port Vlan identifier for Port28. Default Vlan Port Configuration Screen Example Vlan Workgroup Summary 29. Vlan Port Configuration Screen Example30. Vlan Configuration Spanning Multiple Switches Vlan Configuration Rules Igmp Snooping 31. IP Multicast Propagation With Igmp Routing 32. BayStack 450 Switch Filtering IP Multicast Streams 1 33. BayStack 450 Switch Filtering IP Multicast Streams 2 Igmp Snooping Configuration Rules 34. Prioritizing Packets Ieee 802.1p Prioritizing35. Port Transmit Queue Traffic Class Configuration screen opens Figure To configure the port priority level, follow these steps37. Setting Port Priority Example Vlan Port Configuration screen opens FigureMultiLink Trunks 38. Switch-to-Switch Trunk Configuration Example39. Switch-to-Server Trunk Configuration Example Client/Server Configuration Using MultiLink Trunks40. Client/Server Configuration Example Setting up the Trunk Configuration For S1 Trunk Configuration Screen ExamplesTrunk Configuration Screen for Switch S1 42. MultiLink Trunk Configuration Screen for Switch S1 MultiLink Trunk Configuration screen opens FigureUsing the BayStack 450 10/100/1000 Series Switch 43. MultiLink Trunk Configuration Screen for Switch S2 Trunk Configuration Screen for Switch S2Using the BayStack 450 10/100/1000 Series Switch 44. MultiLink Trunk Configuration Screen for Switch S3 Trunk Configuration Screen for Switch S3Using the BayStack 450 10/100/1000 Series Switch 45. MultiLink Trunk Configuration Screen for Switch S4 Trunk Configuration Screen for Switch S4Using the BayStack 450 10/100/1000 Series Switch MultiLink Trunking Configuration Rules Before Configuring TrunksUsing the BayStack 450 10/100/1000 Series Switch 46. Loss of Distributed Trunk Members 47. Path Cost Arbitration Example Spanning Tree Considerations for MultiLink Trunks48. Example 1 Correctly Configured Trunk 49. Example 2 Detecting a Misconfigured Port Additional Tips About the MultiLink Trunking Feature Port Mirroring Conversation Steering 50. Port-Based Mirroring Configuration Example Port-Based Mirroring ConfigurationUsing the BayStack 450 10/100/1000 Series Switch 51. Port Mirroring Port-Based Screen Example Address-Based Mirroring Configuration52. Address-Based Mirroring Configuration Example 53. Port Mirroring Address-Based Screen Example Port Mirroring Configuration Rules Installation Requirements Chapter Installing the BayStack 450 SwitchPackage Contents Installing the BayStack 450 Switch on a Flat Surface Installation ProcedureInstalling the BayStack 450 Switch in a Rack Positioning the Chassis in the Rack Attaching Mounting Brackets Attaching Devices to the BayStack 450 Switch 100 Mb/s Port Connections Connecting the 10BASE-T/100BASE-TX PortsFiber Optic Port Connections Connecting Fiber Optic PortsConsole/Comm Port Connecting to the Console/Comm Port Connecting a Terminal to the Console/Comm PortConnecting Power Grounded AC Power Outlet BayStack 450 Switch AC Power ReceptacleVerifying the Installation Using the LEDs Verifying the InstallationPower-Up Sequence Stage Description LED indicationConfiguration includes an additional test Cascade Sram test Verifying the Installation Using the Self-Test Screen12. Nortel Networks Logo Screen Standalone Switch Setup Initial Setup13. Main Menu 14. IP Configuration/Setup Screen Standalone Switch Stack Setup 15. Main Menu Standalone Switch Example 17. IP Configuration/Setup Screen Stack Configuration Installing the BayStack 450 Switch Page Accessing the CI Menus and Screens Chapter Using the Console InterfaceNavigating the CI Menus and Screens Using the CI Menus and ScreensMap of Console Interface Screens Screen Fields and DescriptionsConsole Interface Main Menu Main MenuConsole Interface Main Menu options Describes the CI main menu optionsReset Configuration FileReset to Default SettingsLogout OptionDescriptionDescribes the IP Configuration/Setup screen fields IP Configuration/SetupIP Configuration/Setup Screen Fields FieldDescription Choosing a BootP Request ModeBootP When Needed BootP Disabled BootP AlwaysBootP or Last Address Describes the Snmp Configuration screen fields Snmp ConfigurationSnmp Configuration Screen Fields Field Description Read-OnlyPoint Describes the System Characteristics screen fields System CharacteristicsSystem Characteristics Screen Fields System Characteristics Screen Fields Describes the Switch Configuration Menu screen options Switch ConfigurationSwitch Configuration Menu Screen Options Option Description Display Port Statistics MAC Address TableClear All Port Statistics Return to Main MenuMAC Address Table Screen Fields Describes the MAC Address Table screen fieldsField Description Aging Time Find an AddressField Description Vlan Configuration MenuVlan Configuration Menu Screen Options Describes the Vlan Configuration Menu screen optionsVlan Configuration Screen Vlan ConfigurationVlan Configuration Screen Fields Describes the Vlan Configuration screen fieldsField Description Create Vlan Delete VlanVlan Port Configuration Vlan Port Configuration Screen Fields Describes the Vlan Port Configuration screen fieldsField Description Unit PortVlan Port Configuration Screen Fields 11. Vlan Display by Port Screen Vlan Display by Port10 describes the Vlan Display by Port screen fields Traffic Class ConfigurationVlan Display by Port Screen Fields Port NameField Description User Priority 11 describes the Traffic Class Configuration screen fieldsTraffic Class Configuration Screen Fields Port Configuration Screen 1 Port Configuration12 describes the Port Configuration screen fields MDAs only support 1000 Mb/s in full-duplex modePort Configuration Screen 2 Port Configuration Screen FieldsSpeed/Duplex1 High Speed Flow Control ConfigurationAutonegotiation High Speed Flow Control Configuration Screen Fields 15. High Speed Flow Control Configuration Screen13. High Speed Flow Control Configuration Screen Fields Choosing a High Speed Flow Control ModeSymmetric Mode Asymmetric MultiLink Trunk ConfigurationUtilization 14. MultiLink Trunk Configuration Menu Screen OptionsOption Description MultiLink Trunk MultiLink Trunk Configuration Screen Field Description Trunk MultiLink Trunk Configuration Screen FieldsMultiLink Trunk Utilization Screen MultiLink Trunk Configuration Screen Fields18. MultiLink Trunk Utilization Screen 1 MultiLink Trunk Utilization Screen Fields 16 describes the MultiLink Trunk Utilization screen fieldsTraffic Type Unit/PortMultiLink Trunk Utilization Screen Fields 20. Port Mirroring Configuration Screen Port Mirroring ConfigurationPort Mirroring Configuration Screen Fields 17 describes the Port Mirroring Configuration screen fieldsAddress-based Monitoring ModesFields Description Port-based 21. Rate Limiting Configuration Screen 1 Rate Limiting Configuration22. Rate Limiting Configuration Screen 2 Rate Limiting Configuration Screen Fields 19 describes the Rate Limiting Configuration screen fields23. Igmp Configuration Screen Igmp ConfigurationIgmp Configuration Screen Fields 20 describes the Igmp Configuration screen fieldsSnooping ProxyIgmp Configuration Screen Fields 24. Port Statistics Screen Port StatisticsPort Statistics Screen Fields 21 describes the Port Statistics screen fieldsGigabit MDA Port Statistics Screen Fields Field Description Collisions 22. Console/Comm Port Configuration Screen Fields Console/Comm Port ConfigurationBaud, 4800 Baud, 9600 Baud, 19200 Baud, 38400 Baud Password FieldDescription Console SwitchSwitch Password Console StackAny Ascii string of up to 15 printable characters An Ascii string of up to 15 printable characters 22. Console/Comm Port Configuration Screen Fields 22. Console/Comm Port Configuration Screen Fields 26. Renumber Stack Units Screen Renumber Stack Units23. Renumber Stack Units Screen Options 23 describes the Renumber Stack Units screen optionsHardware Unit Information Spanning Tree ConfigurationOption Description 24. Spanning Tree Configuration Menu Screen Options29. Spanning Tree Port Configuration Screen 1 Spanning Tree Port ConfigurationSpanning Tree Port Configuration Screen Fields 30. Spanning Tree Port Configuration Screen 2Spanning Tree Port Configuration Screen Fields 31. Spanning Tree Switch Settings Screen Display Spanning Tree Switch Settings26. Spanning Tree Switch Settings Parameters 26 describes the Spanning Tree Switch Settings parametersParameter Description Designated Root Root Port Root Path Cost Hello TimeDelay Parameter Description Forward DelayBridge Hello Time27 describes the Telnet Configuration screen fields Telnet ConfigurationInactivity Timeout Event Logging 27. Telnet Configuration Screen FieldsTelnet Configuration Screen Fields Software Download 28. Software Download Screen Fields 28 describes the Software Download screen fieldsStart Tftp Load of New Image LED Indications During the Download ProcessSoftware image 29. LED Indications During the Software Download Process34. Configuration File Download/Upload Screen Configuration FileCopy Configuration 30. Configuration File Download/Upload Screen FieldsRetrieve Configuration Image to ServerThese parameters are not saved Used in this screen See Parameters Not Saved to the Configuration File35. Event Log Screen Display Event LogWrite Threshold Excessive Bad Entries37. Sample Event Log Entry Exceeding the Write Threshold Flash Update39. Self-Test Screen After Resetting the Switch Reset40. Nortel Networks Logo Screen Reset to Default Settings 41. Self-Test Screen After Resetting to Default Settings Using the BayStack 450 10/100/1000 Series Switch Logout 43. Password Prompt ScreenPage Chapter Troubleshooting Interpreting the LEDs Troubleshooting Configuration’s temporary base unit. This condition occurs Diagnosing and Correcting the Problem Normal Power-Up Sequence Corrective Actions Port Connection ProblemsSymptom Probable cause Corrective action Autonegotiation Modes Port Interface Page Environmental Parameter Operating Specification Storage SpecificationElectrical Parameter Model 450-24T Model 450-12T/12FPerformance Specifications Physical DimensionsParameter Specifications Network Protocol and Standards CompatibilityInterface Options Safety Agency CertificationElectromagnetic Emissions Electromagnetic ImmunityDeclaration of Conformity Table B-1 Operating Range for 1000BASE-SX 1000BASE-SX ModelsOperating Range Micron Description Multimode Fiber Units Transmit CharacteristicsTable B-2 1000BASE-SX Transmit Characteristics Table B-3 1000BASE-SX Receive Characteristics Receive CharacteristicsWorst-Case Power Budget and Penalties Micron Parameter Multimode Fiber Units 1000BASE-LX ModelsTable B-7 1000BASE-LX Receive Characteristics Table B-6 1000BASE-LX Transmit CharacteristicsMicron Single-Mode Description Multimode Fiber Unit Description Value UnitsParameter Um MMF Um SMF Unit Table B-7 BASE-LX Receive CharacteristicsInterface type Model Refer to Appendix C Media Dependent AdaptersLabel Description 10BASE-T/100BASE-TX MDA100BASE-FX MDAs Figure C-2 BASE-FX MDA Front Panels Table C-2 BASE-FX MDA Components 1000BASE-SX MDAs Figure C-3 BASE-SX MDA Front Panels PHY Table C-3 BASE-SX MDA ComponentsM1000BASE-LX MDAs Figure C-4 BASE-LX MDA Front Panels Table C-4 describes the 1000BASE-LX MDA components and LEDsTable C-4 BASE-LX MDA Components Installing an MDAReplacing an MDA with a Different Model Figure C-5. Installing an MDALoosen the thumbscrews and remove the MDA Remove the AC power cord from the power source1000BASE-LX Multimode Applications Using the BayStack 450 10/100/1000 Series Switch To learn more about See this section Appendix D Quick Steps to FeaturesTo create or modify an 802.1Q VLAN, follow the flowcharts Configuring 802.1Q VLANsFigure D-2. Configuring 802.1Q VLANs 2 Figure D-3. Configuring MultiLink Trunks Configuring MultiLink TrunksFigure D-4. Configuring Port Mirroring 1 Configuring Port MirroringFigure D-5. Configuring Port Mirroring 2 Figure D-6. Configuring Igmp Snooping 1 Configuring Igmp SnoopingFigure D-7. Configuring Igmp Snooping 2 Figure D-8. Configuring Igmp Snooping 3 Page Figure E-1. RJ-45 8-Pin Modular Port Connector RJ-45 10BASE-T/100BASE-TX Port ConnectorsMDI and MDI-X Devices Table E-1 RJ-45 Port Connector Pin AssignmentsPin Signal Description Figure E-2. MDI-X to MDI Cable Connections MDI-X to MDI Cable ConnectionsFigure E-3 MDI-X to MDI-X Cable Connections MDI-X to MDI-X Cable ConnectionsTable E-2 DB-9 Console/Comm Port Connector Pin Assignments DB-9 RS-232-D Console/Comm Port ConnectorPage Field Default setting Appears in this CI screen Appendix F Default SettingsField Default setting Appears in this CI screen Default Settings Vlan Default Settings Server Appendix G Sample BootP Configuration File Using the BayStack 450 10/100/1000 Series Switch Index Index-2 Index-3 Index-4 Index-5 Index-6