Cisco Systems OL-16447-01 Switch LEDs, Switch Connections, Bad or Damaged Cable, Link Status

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Appendix 4 Troubleshooting

Diagnosing Problems

Switch LEDs

You must have physical access to the switch to do this. Look at the port LEDs for troubleshooting information about the switch. See the “LEDs” section on page 1-7for a description of the LED colors and their meanings.

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).

•Examine or 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 the destination. If possible, bypass the patch panel, or eliminate faulty media convertors (fiber-optic-to-copper).

•Try the cable in another port or interface, if possible, to see if the problem follows the cable.

Ethernet and Fiber Cables

Make sure that you have the correct cable type for the connection:

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

•For fiber-optic connectors, verify that you have the correct cable for the distance and port type. Make sure that the connected device ports both match and use the same type encoding, optical frequency, and fiber type.

•For copper connections, determine if a 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 2-1for recommended Ethernet cables.

Link Status

Verify that both sides have link. A single broken wire or one shutdown port can cause one side to show link, but the other side does not have link.

A port LED does not guarantee that the cable is fully functional. The cable might have encountered physical stress that causes 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.

Cisco ME 3400E Ethernet Access Switch Hardware Installation Guide

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OL-16447-01

 

 

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Contents Americas Headquarters Text Part Number OL-16447-01Page N T E N T S Installing the Switch Rack-Mounting Link Status IP Settings C-2 Audience PurposeRelated Publications ViiiObtaining Documentation and Submitting a Service Request OL-16447-01 Setting Up the Switch Switch ModelsSwitch Model Description Front PanelCisco ME 3400EG-12CS-M Front Panel AC- and DC-Power Input Connectors Alarm Input PortManagement Port 10/100 Fast Ethernet PortsDual-Purpose Ports SFP ModulesSFP Module Patch Cable Part Number DescriptionUNIs, NNIs, and ENIs LEDsSwitch LED Panels Color System StatusPower-Supply Module LEDs Switch Power-Supply LEDsEthernet Management Port LED Alarm LEDs Port LEDsDual-Purpose Port LEDs LED Color MeaningPower-supply slot Ground connection Rear PanelPower Supply Features 11 Cisco ME 3400EG-2CS-A Rear PanelFans Management OptionsNetwork Configurations OL-16447-01 Switch Installation Switch Installation Switch Installation Installation Guidelines Verifying Switch Operation Installing the SwitchPowering Off the Switch Removing Screws from the Switch Rack-MountingAttaching Brackets to the Switch Rack-Mounting BracketsAttaching Brackets for 19-Inch Racks Attaching Brackets for 19-Inch, 23-Inch, and 24-Inch Racks Attaching Brackets for 23-Inch Racks Attaching Brackets for 24-Inch Racks Attaching Brackets for Etsi Racks Mounting in a Rack Mounting in a RackWall-Mounting Attaching Brackets for Wall-MountingMounting the Switch on a Wall Cisco ME 3400EG-12CS-M Cisco ME 3400E-24TS-M Cisco ME 3400EG-2CS-A Installing and Removing SFP Modules Installing SFP ModulesTable- or Shelf-Mounting 16 SFP Module with a Bale-Clasp Latch Inserting and Removing the SFP Module Patch Cable Removing SFP ModulesConnecting to the 10/100 and 10/100/1000 Ports Removing the SFP Module Patch Cable21 Connecting to an Ethernet Port Connecting to Fiber-Optic SFP Modules 22 Connecting to a Fiber-Optic SFP Module PortConnecting to 1000BASE-T SFP Modules 23 Connecting to a 1000BASE-T SFP ModuleConnecting to Dual-Purpose Ports Where to Go NextPower-Supply Module Description Product OverviewModel number Description Handle-Side Description PSU OK LEDPSU OK Power-Supply Module Installation Connector-Side DescriptionAC-Power-Supply Module DC-Power-Supply ModuleInstallation Guidelines Tools and EquipmentInstalling an AC-Power-Supply Module AC-1 PSU-1 AC-2 PSU-2Removing AC-Power-Supply Modules AC-Power Supply and Power-Cord Retainer in a SwitchInstalling a DC-Power-Supply Module Preparing for Installation Grounding the SwitchRemove the ground screw from the switch rear panel Installing the DC-Power-Supply Module in the Switch 12 Attaching the Ground Lug and Wire AssemblyWiring the DC-Input Power Source Statement15 Terminal Block Plug 18 Inserting Wires in the Terminal Block Plug 21 Inserting the Terminal Block in the Block Header Removing the DC-Power-Supply Module 22 DC-Power Terminal Block With Two FeedsPower Supply Settings OL-16447-01 Diagnosing Problems Switch Post ResultsSwitch LEDs Switch ConnectionsBad or Damaged Cable Ethernet and Fiber CablesSFP Module Port Issues Port and Interface SettingsPing the End Device Spanning Tree LoopsClearing the Switch IP Address and Configuration Switch PerformanceSpeed, Duplex, and Autonegotiation Autonegotiation and NICsFinding the Switch Serial Number Serial Number Location on the Cisco ME 3400E-24TS-MOL-16447-01 Environmental Ranges SFP Module 32 to 131F 0 to 55C 32 to 140F 0 to 60CWith 1 Power-Supply With 2 Power-Supply SFP Module Modules 32 to 149F 0 to 65C32 to 149 F 0 to 65C Physical Dimensions AC-Power RequirementsDC-Power Requirements Physical Dimensions Physical Specifications Power SpecificationsPower Specifications OL-16447-01 Connector Specifications 10/100SFP Module Connectors Figure B-2 Fiber-Optic SFP Module LC Connector10/100 Ethernet Management Port Figure B-3 10/100/1000 Port PinoutsCables and Adapters SFP Module CablesCore Modal Bandwidth SFP Module Wavelength nanometers Fiber Type1000BASE-SX Cable Pinouts TP3Console Port Adapter Pinouts DSR DTR CTS RTSSwitch Console RJ-45-to-DB-25 Port DTE Accessing the CLI Through the Console Port Starting the Terminal-Emulation SoftwareEntering the Initial Configuration Information IP SettingsCompleting the Setup Program Enter an enable secret password, and press Return These choices appear Numerics IN-2 IN-3 IN-4 IN-5 IN-6
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