Cisco Systems 3750-X, 3560-X Switch Connections, Bad or Damaged Cable, Ethernet and Fiber Cables

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Chapter 4 Troubleshooting

Diagnosing Problems

Switch Connections

Bad or Damaged Cable

Always examine the cable for marginal damage or failure. A cable might be just good enough to connect at the physical layer, but it could corrupt packets as a result of subtle damage to the wiring or connectors. You can identify this situation because the port has many packet errors or the port constantly flaps (loses and regains link).

•Exchange the copper or fiber-optic cable with a known good cable.

•Look for broken or missing pins on cable connectors.

•Rule out any bad patch panel connections or media convertors between the source and destination. If possible, bypass the patch panel or eliminate media convertors (fiber-optic-to-copper).

•Try the cable in another port to see if the problem follows the cable.

•Catalyst 3750-X switch StackWise cable: remove and inspect the cable and StackWise port for bent pins or damaged connectors. If the StackWise cable is bad, replace it with a known good cable.

Ethernet and Fiber Cables

Make sure that you have the correct cable:

•For Ethernet, use Category 3 copper cable for 10 Mbps UTP connections. Use either Category 5, Category 5e, or Category 6 UTP for 10/100 or 10/100/1000 Mbps connections.

•Verify that you have the correct fiber-optic cable for the distance and port type. Make sure that the connected device ports match and use the same type encoding, optical frequency, and fiber type. For more information about cabling, see the “SFP and SFP+ Module Cable Specifications” section on page B-5.

•Determine if a copper crossover cable was used when a straight-through was required, or the reverse. Enable auto-MDIX on the switch, or replace the cable. See Table 2-3for recommended Ethernet cables.

Link Status

Verify that both sides have link. A broken wire or a shut down port can cause one side to show link even though the other side does not have link.

A port LED that is on does not guarantee that the cable is functional. It might have encountered physical stress, causing it to function at a marginal level. If the port LED does not turn on:

•Connect the cable from the switch to a known good device.

•Make sure that both ends of the cable are connected to the correct ports.

•Verify that both devices have power.

•Verify that you are using the correct cable type. See Appendix B, “Connector and Cable Specifications” for more information.

•Look for loose connections. Sometimes a cable appears to be seated but is not. Disconnect the cable and then reconnect it.

Catalyst 3750-X and 3560-X Switch Hardware Installation Guide

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OL-19593-01

 

 

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Contents Americas Headquarters Text Part Number OL-19593-01Page N T E N T S Attaching the Rack-Mount Brackets Where to Go Next SFP and SFP+ Module Cable Specifications B-5 Vii Viii Related Publications Catalyst 3750-X switches Catalyst 3560-X switchesPurpose Obtaining Documentation and Submitting a Service Request Switch Models Switch Model Cisco IOS Image DescriptionSwitch Part Number Description PoE+ Ports Front Panel Description10/100/1000 Ethernet Ports Network Modules SFP and SFP+ Modules Network Module DescriptionPart Number Description SFP-10G-LR= SFP-10G-SR=SFP-10G-LRM= SFP-H10GB-CU1M=LEDs SFP-H10GB-CU3M=SFP-H10GB-CU5M= XPS 1 LEDSystem LED Port LEDs and ModesColor System Status Color XPS StatusMode LED Port Mode Description Port Mode Port LED Color MeaningUSB Console LED PWR LED Catalyst Master LED CatalystStack LED Catalyst ColorPoE+ LED Color PoE+ StatusUSB Mini-Type B Port Network Module LEDsG1 LED G3 LED G2/TE1 LED G4/TE2 LED Color Network Module Link StatusCatalyst 3560-X Switch Rear Panel Rear Panel DescriptionRS-232 console is disabled RS-232 console is enabled RJ-45 Console Port LEDUSB Type a Interface StackWise PortsPort Port PoE+ Non-PoE+ Power Supply Module Switch1 Power Supply ModulesSwitch Power Supply Modules Port Port PoE+ Non-PoE+ Power Supply Module Switch PoE Option Port SwitchAC-Power Supply Module LEDs DC-Power Supply Module LEDsXPS Connector Fan ModulesStackPower Connector Catalyst 3750-X Switches Management PortsEthernet Management Port Active link to PCManagement Options USB Mini-Type B PortOff Amber Inactive link Post failureNetwork Configurations Preparing for Installation Safety WarningsOL-19593-01 Installation Guidelines Statement 371-Power Cable and AC AdapterPlanning a Switch Data Stack Catalyst 3750-X Switches Tools and EquipmentData Stack Cabling Configurations Switch Data Stacking Guidelines3-meter StackWise Cables Data Stack Bandwidth and Partitioning Examples Example of a Data Stack with Half Bandwidth ConnectionsStackPower Stacking Guidelines Planning a StackPower Stack Catalyst 3750-X SwitchesPower On Sequence for Switch Data Stacks StackPower Cabling Configurations Part Number Cable Type Length CAB-SPWR-30CMCAB-SPWR-150CM CAB-XPS-58CM10 StackPower Ring Topology 253397 253398 Rack-Mounting Installing the SwitchStackPower Partitioning Examples Switch Installation Installing the Switch Etsi brackets, part number Inch brackets, part number23/24-inch brackets, part number Attaching the Rack-Mount Brackets 18 Attaching Brackets for 19-inch RacksMounting the Switch in a Rack Mounting the Switch in a Rack Table- or Shelf-Mounting 20 Attaching the Adhesive Pads for Table- or Shelf-MountingConnecting to the StackWise Ports Catalyst 3750-X Switches After Installing the SwitchConnecting to the StackPower Ports Catalyst 3750-X Switches Connecting the StackPower Ports to the XPS-2200 Installing a Network Module in the SwitchInstalling Network Modules You need to supply a number-2 Phillips screwdriverInstalling SFP and SFP+ Modules Removing a Network ModuleInstalling an SFP Module 26 Installing an SFP Module in the Network ModuleConnecting Devices to the Ethernet Ports Removing an SFP ModuleDevice Crossover Cable 10/100/1000 Ethernet Port ConnectionsPoE+ Port Connections Where to Go Next Start an Snmp application such as the CiscoView application Power Supply and Fan Module Installation Power Supply Module OverviewBlank cover DC power supply moduleC3KX-PWR-715WAC= AC power supply module AC power cord connector Power cord retainerAC OK LED Release latchExtraction handle DC power supply module Grounding terminalDC OK LED Installation Guidelines AC Power Supply Module LEDsDC Power Supply Module LEDs Release handles Retainer clipsInstalling an AC Power Supply Turn off the power at its sourceRemove the power cord from the power cord retainer Remove the power cord from the power connectorInstalling a DC Power Supply Inserting the AC-Power Supply in the SwitchEquipment That You Need Grounding the Switch Stripping the Ground WireInstalling the DC Power Supply in the Switch See the Installation Guidelines,Wiring the DC Input Power Source 11 Inserting the DC Power Supply in the SwitchFinding the Power Supply Module Serial Number 13 DC Source a and Source B Connections with Common Ground15 715-W and 350-W AC Power Supply Module Serial Number Fan Module Overview Fan ModuleFan LED Retainer clip Exhaust vent Extraction handles Installing a Fan ModuleFinding the Fan Module Serial Number 19 Fan Module Serial Number Switch LEDs Diagnosing ProblemsSwitch Post Results Switch Connections Bad or Damaged CableEthernet and Fiber Cables Link StatusSFP Modules 10/100/1000 Port ConnectionsPoE Port Connections Switch Performance Interface SettingsPing End Device Spanning Tree LoopsCabling Distance Resetting the Switch to the Factory Default SettingsAutonegotiation and Network Interface Cards Finding the Switch Serial Number Switch Serial Number LocationEnvironmental Ranges Switch SpecificationsPhysical Specifications Power Supply Module Specifications Power Specifications C3KX-PWR-1100WACC3KX-PWR-715WAC C3KX-PWR-350WACFan Module Specifications Physical SpecificationOperating Specification Airflow 60 cfmDescription Specification MICChina EMC certifications GostOL-19593-01 Connector Specifications 10/100/1000 PortsGigabit Ethernet CX1 SFP+ Copper Connectors Figure B-2 10-Gigabit Ethernet CX1 Copper Connector exampleFigure B-4 Simplex LC Cable Connector 10/100 Ethernet Management PortConsole Port Figure B-7 10/100 Port PinoutsCable and Adapter Specifications SFP and SFP+ Module Cable SpecificationsGLC-T 1000BASE-LX/LHMMF3 GLC-LH-SMFour Twisted-Pair Cable Pinouts Two Twisted-Pair Cable PinoutsSwitch Console RJ-45-to-DB-9 Port DTE Identifying a Crossover CableConsole Port Adapter Pinouts DeviceSwitch Console RJ-45-to-DB-25 Port DTE GNDRxD TxD DSR DTR CTS RTSOL-19593-01 Accessing the CLI Through a Console Port Accessing the CLIAccessing the CLI Through Express Setup USB Console Port Use one of these options to access the CLIRJ-45 Console Port Installing the Cisco Microsoft Windows USB Device Driver ModeInstalling the Cisco Microsoft Windows XP USB Driver Installing the Cisco Microsoft Windows 2000 USB DriverUninstalling the Cisco Microsoft Windows USB Driver Using the Add or Remove Programs utilityConfiguring the Setup Program Entering the Initial Configuration InformationIP Settings Enter an enable password, and press Return These choices appear Connectors and cables Console port Connectors and cables DescribedIN-2 Port mode Post results Speed Stack StackPower StatusProduct disposal warning Power-supply modulePost Connector Described LED XPSIN-6
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