Cisco Systems 3560-E, 3750-E Check Switch LEDs, Check Switch Connections, Bad or Damaged Cable

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Chapter 4 Troubleshooting

Diagnosing Problems

Check Switch LEDs

If you have physical access to the switch, look at the port LEDs for troubleshooting information about the switch. See the “LEDs” section on page 1-6for a description of the LED colors and their meanings.

Check Switch Connections

Review this section when troubleshooting switch connection problems.

Bad or Damaged Cable

Always check 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). You should:

•Check or swap 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 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.

•Catalyst 3750-E 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 type for the connection:

•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.

•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 more information about cabling, see the “10-Gigabit Ethernet X2 Transceiver Module Cable Specifications” section on page B-5and the “SFP Module Cable Specifications” section on page B-6.

•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 the 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 link 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 link light for the port does not come 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.

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

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Contents Americas Headquarters Text Part Number OL-9774-03Page N T E N T S Connecting Devices to the Ethernet Ports Wiring the DC-Input Power Source Accessing the CLI Through the Console Port C-1 Conventions AudiencePurpose Related Publications ViiiPreface OL-9774-03 Switch Models Part Number DescriptionSwitch Part Number Description Front Panel Description24- and 48-Port Switch Front Panel 10/100/1000 Ethernet Ports PoE PortsCisco TwinGig Converter Module Gigabit Ethernet Module SlotsSFP Modules 24- and 48-Port Switch LEDs LEDsSystem LED Color System StatusColor RPS Status Power Supply LEDsMaster LED ColorPort LEDs and Modes Mode LED Port Mode DescriptionFan LED Port Mode Port LED Color Meaning PoE LED Color PoE StatusStack LED Stack LED24- and 48-Port Switch Rear Panel Rear Panel DescriptionCatalyst 3560E-12D Switch Rear Panel StackWise PortsSwitch Power-Supply Modules48-Port Switch Power-Supply Modules Port PoE Port non-PoE Port Non-PoEAC-Power-Supply Module LEDs DC-Power-Supply Module LEDs DescriptionFan Modules Module LEDs DescriptionRPS Connector Management PortsManagement Options Network Configurations Preparing for Installation Safety WarningsOL-9774-03 Switch Installation Preparing for Installation Statement 371-Power Cable and AC Adapter Tools and Equipment Installation GuidelinesBox Contents Planning a Switch Stack Catalyst 3750-E Switches Switch Stacking GuidelinesStack Cabling Configurations Stack Bandwidth and Partitioning Examples Example of a Stack with Full Bandwidth ConnectionsPower On Sequence for Switch Stacks Example of a Stack with a Failover ConditionInstalling the Switch Rack-MountingRack-Mounting Brackets 10 Removing Screws from the Switch Attaching the Rack-Mount Brackets11 Attaching Brackets for 19-inch Racks Mounting the Switch in a Rack Mounting the Switch in a RackAttaching the Brackets to the Switch for Wall-Mounting Wall-MountingMounting the Catalyst 3560E-12D Switch on a Wall Mounting the Catalyst 3560E-12SD Switch on a Wall After Installing the Switch Table- or Shelf-MountingConnecting to the StackWise Ports Catalyst 3750-E Switches Installing Devices in the 10-Gigabit Ethernet Slots Installing X2 Transceiver Modules and Converter ModulesModule inserted face up Module inserted face down 202046 Installing SFP Modules Removing an X2 Transceiver Module or Converter ModuleInstalling an SFP Module Lower SFP modules are inverted on 24- and 48-port switches Connecting Devices to the Ethernet Ports Removing an SFP ModuleDevice Crossover Cable 10/100/1000 Ethernet Port ConnectionsPoE Port Connections Switch Installation Connecting Devices to the Ethernet Ports Where to Go Next OL-9774-03 Power Supply and Fan Module Installation Installation OverviewOL-9774-03 Installing an AC-Power Supply Inserting the AC-Power Supply in 24- and 48-Port SwitchesInstalling a DC-Power Supply AC-Power Supply with Power Cord RetainerPreparing for Installation Grounding the SwitchStripping the Ground Wire See -9for the Catalyst 3560E-12SD ground location Installing the DC Power Supply in the Switch Inserting the DC-Power Supply in 24- and 48-Port SwitchesWiring the DC-Input Power Source Installing a Fan Module 12 Inserting the Fan Module in 24- and 48-Port Switches 202049 OL-9774-03 Diagnosing Problems Check Switch Post ResultsBad or Damaged Cable Check Switch LEDsCheck Switch Connections Ethernet and Fiber CablesPoE Connections Transceiver IssuesPort and Interface Settings Spanning Tree Loops Check Switch PerformancePing End Device Speed, Duplex, and AutonegotiationCabling Distance How to Clear the Switch IP Address and ConfigurationAutonegotiation and NIC Cards Finding the Switch Serial Number How to Replace a Failed Stack MemberTroubleshooting How to Replace a Failed Stack Member OL-9774-03 Physical Specifications Environmental RangesPower Specifications Table A-5 OL-9774-03 Connector and Cable Specifications Connector Specifications10/100/1000 Ports Gigabit Ethernet Module InterfacesFigure B-4 Duplex LC Cable Connector 10/100 Ethernet Management Port Console PortModal X2 Product Wavelength Core Size Bandwidth Number Cable and Adapter SpecificationsGigabit Ethernet X2 Transceiver Module Cable Specifications Microns MHz/kmTransmit SFP Module Cable SpecificationsX2 Product Transmit Power Receive Power Number DBm Wavelength nmFour Twisted-Pair Cable Pinouts 652 43.4 to 62 miles 1530 To 100 km 1570 1610Two Twisted-Pair Crossover Cable Schematic Two Twisted-Pair Cable PinoutsConsole Port Adapter Pinouts Switch Console RJ-45-to-DB-9 Port DTEIdentifying a Crossover Cable DeviceSwitch Console RJ-45-to-DB-25 Port DTE Accessing the CLI Through the Console Port Accessing the CLIAccessing the CLI Through Express Setup Connecting to the Console Port Entering the Initial Configuration InformationIP Settings Completing the Setup Program Line vty 0 These choices appear OL-9774-03 Numerics IN-2 IN-3 IN-4 IN-5 IN-6
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