Cisco Systems 3750-E, 3560-E PoE Connections, Transceiver Issues, Port and Interface Settings

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Chapter 4 Troubleshooting

Diagnosing Problems

•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.

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

PoE Connections

When a powered device is connected to PoE port, but no power is received, you should:

•Use the Mode button to show the PoE status for all ports. See Table 1-9and Table 1-10for a description of the LEDs and their meanings.

•Check the port status by using the show interfaces privileged EXEC command to check the port error-disabled, disabled, or shutdown status. Re-enable the port if necessary.

•Verify that the power supply installed in the switch meets the power requirements of your connected devices. See the “Power-Supply Modules” section on page 1-15for more information.

•Check the cable type. Many legacy powered devices, including older Cisco IP phones and access points that do not fully support IEEE 802.3af, might not support PoE when connected to the switch by a crossover cable. Replace the crossover cable with a straight-through cable.

Caution PoE faults are caused when noncompliant cabling or powered devices are connected to a PoE port. Only standard-compliant cabling can be used to connect Cisco pre-standard IP phones and wireless access points or IEEE 802.3af-compliant devices to PoE ports. (You must remove a cable or device that causes a PoE fault from the network.)

Transceiver Issues

Use only Cisco X2 transceiver modules and SFP modules on the switch. Each Cisco module has an internal serial EEPROM that is encoded with security information. This encoding provides a way for Cisco to identify and validate that the module meets the requirements for the switch. Check these items:

•Bad or wrong X2 transceiver, Cisco TwinGig Converter module, or SFP module. Exchange suspect module with known good module. Verify that the module is supported on this platform. (The switch release notes on Cisco.com list the X2 and SFP modules that the switch supports.)

•Use the show interfaces privileged EXEC command to check the port or module error-disabled, disabled, or shutdown status. Re-enable the port if needed.

•Make sure that all fiber connections are properly cleaned and securely connected.

•For CX4 module connections, make sure that cable routing does not violate the minimum allowed cable bend radius. See the module documentation for specific cabling requirements.

•For LX4 modules, a mode conditioning patch is recommended for MMF applications.

Port and Interface Settings

An obvious but sometimes overlooked cause of port connectivity failure is a disabled port. Verify that the port or interface is not disabled or powered down for some reason. If a port or interface is manually shut down on one side of the link or the other side, the link does not come up until you re-enable the

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

 

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Contents Text Part Number OL-9774-03 Americas HeadquartersPage 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 Audience PurposeConventions Viii Related PublicationsPreface OL-9774-03 Part Number Description Switch ModelsFront Panel Description Switch Part Number Description24- and 48-Port Switch Front Panel PoE Ports 10/100/1000 Ethernet PortsGigabit Ethernet Module Slots SFP ModulesCisco TwinGig Converter Module LEDs 24- and 48-Port Switch LEDsColor System Status System LEDColor Power Supply LEDsMaster LED Color RPS StatusMode LED Port Mode Description Fan LEDPort LEDs and Modes Port Mode Port LED Color Meaning Color PoE Status PoE LEDStack LED Stack LEDRear Panel Description 24- and 48-Port Switch Rear PanelStackWise Ports Catalyst 3560E-12D Switch Rear PanelPort PoE Port non-PoE Port Non-PoE Power-Supply Modules48-Port Switch Power-Supply Modules SwitchDC-Power-Supply Module LEDs Description AC-Power-Supply Module LEDsModule LEDs Description Fan ModulesManagement Ports RPS ConnectorManagement Options Network Configurations Safety Warnings Preparing for InstallationOL-9774-03 Switch Installation Preparing for Installation Statement 371-Power Cable and AC Adapter Installation Guidelines Box ContentsTools and Equipment Switch Stacking Guidelines Planning a Switch Stack Catalyst 3750-E SwitchesStack Cabling Configurations Example of a Stack with Full Bandwidth Connections Stack Bandwidth and Partitioning ExamplesExample of a Stack with a Failover Condition Power On Sequence for Switch StacksRack-Mounting Installing the SwitchRack-Mounting Brackets Attaching the Rack-Mount Brackets 10 Removing Screws from the Switch11 Attaching Brackets for 19-inch Racks Mounting the Switch in a Rack Mounting the Switch in a RackWall-Mounting Attaching the Brackets to the Switch for Wall-MountingMounting the Catalyst 3560E-12D Switch on a Wall Mounting the Catalyst 3560E-12SD Switch on a Wall Table- or Shelf-Mounting After Installing the SwitchConnecting to the StackWise Ports Catalyst 3750-E Switches Installing X2 Transceiver Modules and Converter Modules Installing Devices in the 10-Gigabit Ethernet SlotsModule inserted face up Module inserted face down 202046 Removing an X2 Transceiver Module or Converter Module Installing SFP ModulesInstalling an SFP Module Lower SFP modules are inverted on 24- and 48-port switches Removing an SFP Module Connecting Devices to the Ethernet Ports10/100/1000 Ethernet Port Connections PoE Port ConnectionsDevice Crossover Cable Switch Installation Connecting Devices to the Ethernet Ports Where to Go Next OL-9774-03 Installation Overview Power Supply and Fan Module InstallationOL-9774-03 Inserting the AC-Power Supply in 24- and 48-Port Switches Installing an AC-Power SupplyAC-Power Supply with Power Cord Retainer Installing a DC-Power SupplyGrounding the Switch Preparing for InstallationStripping the Ground Wire See -9for the Catalyst 3560E-12SD ground location Inserting the DC-Power Supply in 24- and 48-Port Switches Installing the DC Power Supply in the SwitchWiring the DC-Input Power Source 12 Inserting the Fan Module in 24- and 48-Port Switches Installing a Fan Module202049 OL-9774-03 Check Switch Post Results Diagnosing ProblemsEthernet and Fiber Cables Check Switch LEDsCheck Switch Connections Bad or Damaged CableTransceiver Issues Port and Interface SettingsPoE Connections Speed, Duplex, and Autonegotiation Check Switch PerformancePing End Device Spanning Tree LoopsHow to Clear the Switch IP Address and Configuration Autonegotiation and NIC CardsCabling Distance How to Replace a Failed Stack Member Finding the Switch Serial NumberTroubleshooting How to Replace a Failed Stack Member OL-9774-03 Environmental Ranges Physical SpecificationsPower Specifications Table A-5 OL-9774-03 Connector Specifications Connector and Cable SpecificationsGigabit Ethernet Module Interfaces 10/100/1000 PortsFigure B-4 Duplex LC Cable Connector Console Port 10/100 Ethernet Management PortMicrons MHz/km Cable and Adapter SpecificationsGigabit Ethernet X2 Transceiver Module Cable Specifications Modal X2 Product Wavelength Core Size Bandwidth NumberDBm Wavelength nm SFP Module Cable SpecificationsX2 Product Transmit Power Receive Power Number Transmit652 43.4 to 62 miles 1530 To 100 km 1570 1610 Four Twisted-Pair Cable PinoutsTwo Twisted-Pair Cable Pinouts Two Twisted-Pair Crossover Cable SchematicDevice Switch Console RJ-45-to-DB-9 Port DTEIdentifying a Crossover Cable Console Port Adapter PinoutsSwitch Console RJ-45-to-DB-25 Port DTE Accessing the CLI Accessing the CLI Through Express SetupAccessing the CLI Through the Console Port Entering the Initial Configuration Information IP SettingsConnecting to the Console Port 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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