Cisco Systems 3120 manual SFP Module Port Issues, Port and Interface Settings, Ping the End Device

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Chapter 3 Troubleshooting

Diagnosing Problems

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

•Test 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 module. 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 module. Test 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 “Cisco TwinGig Converter Module” section on page 1-4for a list of supported SFP modules.

•Use the show interfaces privileged EXEC command to determine 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

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 determine 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

Test the end device by pinging it from the directly connected switch module 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 module 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 module 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 module sends is received by its neighbor, but the switch module 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 module 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 module, see the “Understanding UDLD” section in the software configuration guide.

Cisco Catalyst Blade Switch 3120 for HP Hardware Installation Guide

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OL-12246-01

 

 

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Contents March Americas HeadquartersPage N T E N T S Setup Accessing the CLI Through the Console Port OL-12246-01 Audience PurposeOrganization Conventions Related PublicationsPreface OL-12246-01 Switch Module Features Overview Product OverviewUID 1 LED Port DescriptionOther Features Switch Module Console Port10/100/1000 Ports Gigabit Ethernet Module SlotsCisco TwinGig Converter Module LRMLEDs System LEDStack LED Color System StatusStack Master LED Stack Member LEDUID and Health LEDs RJ-45 Uplink Port LEDsX2 Module Installed Only the CBS3120X Switch Gigabit Ethernet Module Slot Port LEDsPower Connectors Management OptionsStackWise Plus Ports Using the Device Manager Device ManagerUsing the Command-Line Interface Network ConfigurationsSwitch Installation Preparing for InstallationSafety Warnings Installation Guidelines Verifying Package Contents HP c-Class BladeSystem Enclosure Architecture Rear View of the Blade EnclosureInstalling the Switch Module in the Blade Enclosure StatementOpen the Release Latch Switch Module IP Addresses Switch Installation Onboard Administrator Interconnect Bay Summary Window Using Express Setup Express Setup Advanced Settings TableSetting the Installed Switch Module As the Stack Master Enter switch 1 priorityPlanning and Creating a Switch Stack Refreshing the PC IP AddressStack Cabling Configurations 250304 Connecting to the StackWise Plus Ports Installing Devices in the 10-Gigabit Ethernet Slots Installing a Transceiver or Converter Module 12 Installing X2 Transceiver Modules Removing a ModuleInstalling SFP Modules Installing an SFP Module14 Converter Module with SFP Modules Installed Removing an SFP ModuleConnecting to the 10/100/1000 Ports 15 Connecting to an Ethernet PortPlanning 10/100/1000 Ethernet Port Connections Where to Go Next Device Crossover CableSwitch Installation Where to Go Next Diagnosing Problems Verify the Switch Module Post ResultsLook at the Switch Module LEDs Confirm the Switch Module ConnectionsBad or Damaged Cable Ethernet and Fiber CablesSFP Module Port Issues Port and Interface SettingsPing the End Device Spanning Tree LoopsVerify the Switch Module Performance Speed, Duplex, and AutonegotiationAutonegotiation and Network-Interface Cards Cabling DistanceClearing the Switch Module IP Address and Configuration Replacing a Failed Stack MemberLocating the Switch Module Serial Number 250310OL-12246-01 Physical Dimensions Environmental RangesOL-12246-01 Connector and Cable Specifications Connector SpecificationsConnecting to 10BASE-T- and 100BASE-TX-Compatible Devices Connecting to 1000BASE-T DevicesGigabit Ethernet Module Interfaces Cisco TwinGig Converter Module PortsCable and Adapter Specifications Gigabit Ethernet X2 Transceiver Module Cable SpecificationsConsole Port Microns MHz/km DistanceX2 Product Transmit Power Receive Power Number TransmitDBm Wavelength nm SFP Module Cable Specifications Two Twisted-Pair Cable Pinouts1000BASE-SX GLC-SX-MMFour Twisted-Pair Cable Pinouts for 1000BASE-T Ports TP3Switch Console RJ-45-to-DB-9 Port DTE Identifying a Crossover CableConsole Port Adapter Pinouts DeviceSwitch Console RJ-45-to-DB-25 Port DTE OL-12246-01 Accessing the CLI Through the Console Port Connecting to 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 Numerics CLIIN-2 UID PostLED IN-4IN-5 IN-6
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