Cisco Systems 3120 manual Look at the Switch Module LEDs, Confirm the Switch Module Connections

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Chapter 3 Troubleshooting

Diagnosing Problems

Look at the Switch Module LEDs

You must have physical access to the switch module to do this. Look at the port LEDs for troubleshooting information about the switch module. See the “LEDs” section on page 1-5for a description of the LED colors and their meanings.

Confirm the Switch Module Connections

Review this section when troubleshooting switch module connectivity problems.

Bad or Damaged Cable

Always test the cable for marginal damage or failure. A cable might be sufficient to connect at the physical layer but then cause packet corruption because of subtle damage to its wiring or connectors. You can identify this situation because the port will have many packet errors, or the port will constantly lose and regain link. In these situations:

•Exchange the copper or fiber-optic cable with a known, good cable.

•Look for broken or missing pins on cable connectors.

•Rule out any insufficient patch panel connections or media convertors between the source and the destination. If possible, bypass the patch panel or eliminate faulty media convertors, such as fiber-optic-to-copper convertors.

•Try using the cable in another port or interface to see if the problem also exists there.

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 unshielded twisted pair (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 ports on the connected device match and that they use the same type of encoding, optical frequency, and fiber type. For more information about cabling, see Appendix B, “Connector and Cable Specifications.”

•For copper connections, determine if a crossover cable was used when a straight-through cable was required, or the reverse. Enable auto-MDIX on the switch module, or replace the cable.

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 module 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 Catalyst Blade Switch 3120 for HP Hardware Installation Guide

 

OL-12246-01

3-2

 

 

 

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Contents Americas Headquarters MarchPage N T E N T S Setup Accessing the CLI Through the Console Port OL-12246-01 Organization AudiencePurpose Related Publications ConventionsPreface OL-12246-01 Product Overview Switch Module Features OverviewPort Description UID 1 LEDSwitch Module Console Port Other FeaturesLRM 10/100/1000 PortsGigabit Ethernet Module Slots Cisco TwinGig Converter ModuleColor System Status LEDsSystem LED Stack LEDRJ-45 Uplink Port LEDs Stack Master LEDStack Member LED UID and Health LEDsGigabit Ethernet Module Slot Port LEDs X2 Module Installed Only the CBS3120X SwitchStackWise Plus Ports Power ConnectorsManagement Options Device Manager Using the Device ManagerNetwork Configurations Using the Command-Line InterfacePreparing for Installation Switch InstallationSafety Warnings Installation Guidelines Verifying Package Contents Rear View of the Blade Enclosure HP c-Class BladeSystem Enclosure ArchitectureStatement Installing the Switch Module in the Blade EnclosureOpen the Release Latch Switch Module IP Addresses Switch Installation Onboard Administrator Interconnect Bay Summary Window Express Setup Advanced Settings Table Using Express SetupEnter switch 1 priority Setting the Installed Switch Module As the Stack MasterRefreshing the PC IP Address Planning and Creating a Switch StackStack Cabling Configurations 250304 Connecting to the StackWise Plus Ports Installing Devices in the 10-Gigabit Ethernet Slots Installing a Transceiver or Converter Module Removing a Module 12 Installing X2 Transceiver ModulesInstalling an SFP Module Installing SFP ModulesRemoving an SFP Module 14 Converter Module with SFP Modules Installed15 Connecting to an Ethernet Port Connecting to the 10/100/1000 PortsPlanning 10/100/1000 Ethernet Port Connections Device Crossover Cable Where to Go NextSwitch Installation Where to Go Next Verify the Switch Module Post Results Diagnosing ProblemsEthernet and Fiber Cables Look at the Switch Module LEDsConfirm the Switch Module Connections Bad or Damaged CableSpanning Tree Loops SFP Module Port IssuesPort and Interface Settings Ping the End DeviceCabling Distance Verify the Switch Module PerformanceSpeed, Duplex, and Autonegotiation Autonegotiation and Network-Interface CardsReplacing a Failed Stack Member Clearing the Switch Module IP Address and Configuration250310 Locating the Switch Module Serial NumberOL-12246-01 Environmental Ranges Physical DimensionsOL-12246-01 Connector Specifications Connector and Cable SpecificationsConnecting to 1000BASE-T Devices Connecting to 10BASE-T- and 100BASE-TX-Compatible DevicesCisco TwinGig Converter Module Ports Gigabit Ethernet Module InterfacesMicrons MHz/km Distance Cable and Adapter SpecificationsGigabit Ethernet X2 Transceiver Module Cable Specifications Console PortDBm Wavelength nm X2 Product Transmit Power Receive Power NumberTransmit GLC-SX-MM SFP Module Cable SpecificationsTwo Twisted-Pair Cable Pinouts 1000BASE-SXTP3 Four Twisted-Pair Cable Pinouts for 1000BASE-T PortsDevice Switch Console RJ-45-to-DB-9 Port DTEIdentifying a Crossover Cable Console Port Adapter PinoutsSwitch Console RJ-45-to-DB-25 Port DTE OL-12246-01 Connecting to the Console Port Accessing the CLI Through the Console PortOL-12246-01 Figure C-1 Connecting through the Switch Module Console Port Completing the Initial Configuration To configure Snmp now, enter yes These choices appear CLI NumericsIN-2 Post UIDIN-4 LEDIN-5 IN-6
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