Cisco Systems Cisco ME 3400 manual SFP Module Port Issues, Port and Interface Settings

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Chapter 3 Troubleshooting

Diagnosing Problems

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

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

SFP Module Port Issues

Use only Cisco small form-factor pluggable (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 a known, good module. Verify that this module supports this platform. See the “SFP Modules” section on page 1-7for a list of supported SFP modules.

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

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

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 for some reason powered down. If a port or interface is manually shut down on one or the other side of the link, the link does not come up until you re-enable the port.

Use the show interfaces privileged EXEC command to check the port or interface error-disabled, disabled, or shutdown status on both sides of the connection. If necessary, re-enable the port or the interface.

Ping the End Device

Check the end device by pinging it 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

Spanning Tree Protocol (STP) loops can cause serious performance issues that might appear to be port or interface problems. In this situation, the switch bandwidth is used repeatedly by the same frames, crowding out legitimate traffic.

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

You can enable the UniDirectional Link Detection (UDLD) protocol on the switch to help identify difficult-to-find unidirectional link problems. UDLD supports a normal mode of operation (the default) and an aggressive mode. In normal mode, UDLD detects unidirectional links because of incorrectly connected interfaces on fiber-optic connections. In aggressive mode, UDLD also detects unidirectional links caused by one-way traffic on fiber-optic and twisted-pair links and by incorrectly connected interfaces on fiber-optic links. For information about enabling UDLD on the switch, see the “Understanding UDLD” section in the software configuration guide.

Cisco ME 3400 Ethernet Access Switch Hardware Installation Guide

 

OL-7677-04

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Contents Americas Headquarters Page N T E N T S Installing and Removing SFP Modules Speed, Duplex, and Autonegotiation IP Settings D-2 Audience PurposeOrganization Conventions Related Publications OL-7677-04 Switch Models Setting up the SwitchFront Panel Description 1describes the switch modelsCisco ME 3400-24TS AC Ethernet Access Switch Front Panel Cisco ME 3400-24TS AC and DC Switches Front PanelCisco ME 3400G-12CS AC and DC Switches Front Panel Cisco ME 3400-24FS Switch AC Switch Front PanelSystem LED Dual-purpose ports Console port SFP module ports Cisco ME 3400G-2CS Switch Front Panel10/100 Ports Only the Cisco ME-3400-24TS Switches SFP Modules SFP Module PortsThese illustrations show the location of the System LED LEDsSFP Module Patch Cable System LEDConsole Port LEDs Power Supply LEDs Only Cisco ME 3400G-12CS SwitchesDual-Purpose Port LEDs Console PortExhaust fan Cable lock Ground connector Cisco ME 3400-24TS Switch Rear PanelCisco ME 3400-24FS Switch Rear Panel Cable lock Ground connector Fan exhaustFan exhaust AC power connector Ground connector Power Supply FeaturesCisco ME 3400G-12S Switch Rear Panel Cisco ME 3400-2CS Switch Rear PanelManagement Options Cisco ME AC Switch Power SupplyCisco ME DC Switch Power Supply Network ConfigurationsThis section covers these topics Preparing for InstallationSwitch Installation Preparing for Installation 122F 50C Statement Installation Guidelines Cisco ME 3400-24TS SwitchesCisco ME 3400G-12CS Switches This section describes these installation procedures Verifying Switch OperationInstalling the Switch Powering Off the SwitchRack-Mounting Removing Screws from the SwitchRack-Mounting Brackets Attaching Brackets to the SwitchAttaching Brackets to 19-Inch Racks 191022 Attaching Brackets for 23-Inch Racks Attaching Brackets for 24-Inch Racks Attaching Brackets for Etsi Racks Phillips machine screws Cable guide and screw Mounting the Switch in a RackAttaching the Brackets to the Switch for Wall-Mounting Wall-MountingPhillips flat-head screws 11 Mounting the Switch on a Wall Mounting the Switch on a WallTable- or Shelf-Mounting Installing and Removing SFP Modules12 SFP Module with a Bale-Clasp Latch Installing SFP ModulesBale clasp Removing SFP ModulesInserting and Removing the SFP Module Patch Cable 17 Connecting to an Ethernet Port Connecting to the 10/100 and 10/100/1000 PortsConnecting to SFP Modules Connecting to Fiber-Optic SFP ModulesLC connector 19 Connecting to a 1000BASE-T SFP Module Connecting to 1000BASE-T SFP Modules20 Connecting to a Dual-Purpose Port Connecting to Dual-Purpose PortsWhere to Go Next Diagnosing Problems Check Switch Post ResultsThis section includes these troubleshooting topics Ethernet and Fiber Cables Check Switch LEDsCheck Switch Connections Bad or Damaged CableSpanning Tree Loops SFP Module Port IssuesPort and Interface Settings Ping the End DeviceAutonegotiation and NIC Cards How to Clear the Switch IP Address and ConfigurationCheck Switch Performance Speed, Duplex, and AutonegotiationSerial Number Location on the Cisco ME 3400G-2CS Switch Locating the Switch Serial NumberSerial Number Location on the Cisco ME 3400G-2CS Switch Connector Specifications These sections describe the connectors used with the switch10/100 Ports Figure A-1 10/100 Port Pinouts Dual-Purpose Ports Figure A-2 Fiber-Optic SFP Module LC ConnectorSFP Module Cable Specifications Cable and Adapter SpecificationsTwo Twisted-Pair Cable Pinouts Four Twisted-Pair Cable Pinouts for 1000BASE-T Ports Crossover Cable and Adapter PinoutsIdentifying a Crossover Cable Adapter Pinouts TxD RxDRxD TxD Switch Console RJ-45-to-DB-25 Port DTE This appendix lists the switch technical specifications Technical SpecificationsAC Power Requirements Physical Dimensions OL-7677-04 Connecting to DC Power Grounding the Switch Preparing the Ground WireReview these safety warnings before you ground the switch Figure C-1 Stripping the Ground Wire Figure C-3 Torquing Ground-Lug Screws Torque to 15 lbf-inConnecting the Grounding Wire to Earth Ground Telco rack Grounding wireTelco rack Primary power feed Secondary redundant power feed Wiring the DC-Input Power SourceCisco ME 3400-24TS Switches Cisco ME 3400G-12CS SwitchesAll Cisco ME 3400 Switches Figure C-8 Terminal Block Plug Console Figure C-11 Inserting Wires in the Terminal Block Plug Figure C-13 Completed Wiring of Terminal Block Plug OL-7677-04 Starting the Terminal-Emulation Software Accessing the CLI Through the Console PortEntering the Initial Configuration Information IP SettingsCompleting the Setup Program Switch or as a standalone switch Enter an enable secret password, and press ReturnEnter an enable password, and press Return Enter a virtual terminal Telnet password, and press ReturnThese choices appear Numerics Auto-MDIX Pinouts See also connectors and cables cautionsConnectors and cables 10/100 ports Console port Cisco IOS command-line interface CiscoViewConnecting outside the building warning Connection proceduresIN-3 Installing SFP modules 2-17 toConnectors LEDs Running at power on Power Connecting to ACConnecting to DC Power onIN-5 Ground connectionIN-6
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