Cisco Systems OL-16447-01 manual SFP Module Port Issues, Port and Interface Settings

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Appendix 4 Troubleshooting

Diagnosing Problems

•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.

SFP Module Port Issues

Use only Cisco 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 SFP module. Exchange the suspect module with known good module. Verify that the module is supported on this platform. (The switch release notes on Cisco.com list the SFP modules that the switch supports.)

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

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

Port and Interface Settings

An obvious but sometimes overlooked cause of port connectivity failure is a disabled interface. Verify that the interface is not disabled or powered off for some reason. If an 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 interface. Use the show interfaces privileged EXEC command to see if the interface is error-disabled, disabled, or shutdown on either side of the connection. If needed, re-enable the interface.

Ping the End Device

Ping from the directly connected switch first, and then work your way back port by port, interface by interface, trunk by trunk, until you find the source of the connectivity issue. Make sure that each switch can identify the end device MAC address in its Content-Addressable Memory (CAM) table.

Spanning Tree Loops

STP loops can cause serious performance issues that look like port or interface problems.

Unidirectional links can cause spanning-tree loops. A unidirectional link occurs when the traffic sent by the switch is received by its neighbor, but does not receive traffic sent by the neighbor. A broken fiber-optic cable, other cabling, or a port issue could cause this one-way communication.

The UniDirectional Link Detection (UDLD) protocol helps identify unidirectional link problems. For more information, see the “Understanding UDLD” section in the switch software configuration guide on Cisco.com.

Cisco ME 3400E Ethernet Access Switch Hardware Installation Guide

 

OL-16447-01

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Contents Text Part Number OL-16447-01 Americas HeadquartersPage N T E N T S Installing the Switch Rack-Mounting Link Status IP Settings C-2 Purpose AudienceViii Related PublicationsObtaining Documentation and Submitting a Service Request OL-16447-01 Switch Models Setting Up the SwitchFront Panel Switch Model DescriptionCisco ME 3400EG-12CS-M Front Panel Alarm Input Port AC- and DC-Power Input Connectors10/100 Fast Ethernet Ports Management PortDual-Purpose Ports SFP ModulesPart Number Description SFP Module Patch CableLEDs UNIs, NNIs, and ENIsColor System Status Switch LED PanelsSwitch Power-Supply LEDs Power-Supply Module LEDsEthernet Management Port LED Port LEDs Alarm LEDsDual-Purpose Port LEDs LED Color MeaningRear Panel Power-supply slot Ground connection11 Cisco ME 3400EG-2CS-A Rear Panel Power Supply FeaturesManagement Options FansNetwork Configurations OL-16447-01 Switch Installation Switch Installation Switch Installation Installation Guidelines Installing the Switch Verifying Switch OperationPowering Off the Switch Rack-Mounting Removing Screws from the SwitchRack-Mounting Brackets Attaching Brackets to the SwitchAttaching 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 RackAttaching Brackets for Wall-Mounting Wall-MountingMounting the Switch on a Wall Cisco ME 3400EG-12CS-M Cisco ME 3400E-24TS-M Cisco ME 3400EG-2CS-A Installing SFP Modules Installing and Removing SFP ModulesTable- or Shelf-Mounting 16 SFP Module with a Bale-Clasp Latch Removing SFP Modules Inserting and Removing the SFP Module Patch CableRemoving the SFP Module Patch Cable Connecting to the 10/100 and 10/100/1000 Ports21 Connecting to an Ethernet Port 22 Connecting to a Fiber-Optic SFP Module Port Connecting to Fiber-Optic SFP Modules23 Connecting to a 1000BASE-T SFP Module Connecting to 1000BASE-T SFP ModulesWhere to Go Next Connecting to Dual-Purpose PortsProduct Overview Power-Supply Module DescriptionModel number Description PSU OK LED Handle-Side DescriptionPSU OK Connector-Side Description Power-Supply Module InstallationAC-Power-Supply Module DC-Power-Supply ModuleTools and Equipment Installation GuidelinesAC-1 PSU-1 AC-2 PSU-2 Installing an AC-Power-Supply ModuleAC-Power Supply and Power-Cord Retainer in a Switch Removing AC-Power-Supply ModulesInstalling a DC-Power-Supply Module Grounding the Switch Preparing for InstallationRemove the ground screw from the switch rear panel 12 Attaching the Ground Lug and Wire Assembly Installing the DC-Power-Supply Module in the SwitchStatement Wiring the DC-Input Power Source15 Terminal Block Plug 18 Inserting Wires in the Terminal Block Plug 21 Inserting the Terminal Block in the Block Header 22 DC-Power Terminal Block With Two Feeds Removing the DC-Power-Supply ModulePower Supply Settings OL-16447-01 Switch Post Results Diagnosing ProblemsSwitch Connections Switch LEDsBad or Damaged Cable Ethernet and Fiber CablesPort and Interface Settings SFP Module Port IssuesPing the End Device Spanning Tree LoopsSwitch Performance Clearing the Switch IP Address and ConfigurationSpeed, Duplex, and Autonegotiation Autonegotiation and NICsSerial Number Location on the Cisco ME 3400E-24TS-M Finding the Switch Serial NumberOL-16447-01 SFP Module 32 to 131F 0 to 55C 32 to 140F 0 to 60C Environmental Ranges32 to 149F 0 to 65C With 1 Power-Supply With 2 Power-Supply SFP Module Modules32 to 149 F 0 to 65C AC-Power Requirements Physical DimensionsDC-Power Requirements Physical Dimensions Power Specifications Physical SpecificationsPower Specifications OL-16447-01 10/100 Connector SpecificationsFigure B-2 Fiber-Optic SFP Module LC Connector SFP Module ConnectorsFigure B-3 10/100/1000 Port Pinouts 10/100 Ethernet Management PortSFP Module Cables Cables and AdaptersCore Modal Bandwidth SFP Module Wavelength nanometers Fiber Type1000BASE-SX TP3 Cable PinoutsDSR DTR CTS RTS Console Port Adapter PinoutsSwitch Console RJ-45-to-DB-25 Port DTE Starting the Terminal-Emulation Software Accessing the CLI Through the Console PortIP Settings Entering the Initial Configuration InformationCompleting 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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