Cisco Systems 3120 manual Verify the Switch Module Performance, Speed, Duplex, and Autonegotiation

Page 49

Chapter 3 Troubleshooting

Diagnosing Problems

Verify the Switch Module Performance

Review this section when you troubleshoot switch module performance problems.

Speed, Duplex, and Autonegotiation

If the port statistics show a large number of alignment errors, frame check sequence (FCS), or late-collisions errors, a speed or duplex mismatch might be the problem.

A common issue with speed and duplex occurs when the duplex settings are mismatched between two switches, between a switch module and a router, or between the switch module and a workstation or server. This can happen when you manually set the speed and duplex or because of autonegotiation issues between the two devices.

These circumstances can result in a mismatch:

•A manually set speed or duplex parameter is different from the manually set speed or duplex parameter on the connected port.

•A port is set to autonegotiate, and the connected port is set to full duplex with no autonegotiation.

To maximize switch module performance and ensure a link, follow one of these guidelines when you set or change the settings for duplex and speed:

•Let both ports autonegotiate both speed and duplex.

•Manually set the speed and duplex parameters for the ports on both ends of the connection.

•If a remote device does not autonegotiate, configure the duplex settings on the two ports to match. The speed parameter can adjust itself even if the connected port does not autonegotiate.

Autonegotiation and Network-Interface Cards

Problems sometimes occur between the switch module and third-party network-interface cards (NICs). By default, the switch module ports and interfaces are set to autonegotiate. It is common for devices such as laptop computers or other devices to also be set to autonegotiate, yet sometimes autonegotiation issues occur.

To troubleshoot autonegotiation problems, try manually setting both sides of the connection. If this does not solve the problem, the firmware or software on your NIC might be causing the problem. Upgrade the NIC driver to the latest version available from the manufacturer.

Cabling Distance

If the port statistics show excessive FCS, late-collision, or alignment errors, verify that the cable distance from the switch module to the connected device meets the recommended guidelines. See the “Cable and Adapter Specifications” section on page B-4for cabling guidelines.

Cisco Catalyst Blade Switch 3120 for HP Hardware Installation Guide

 

OL-12246-01

3-4

 

 

 

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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 Purpose AudienceOrganization Related Publications ConventionsPreface OL-12246-01 Product Overview Switch Module Features OverviewPort Description UID 1 LEDSwitch Module Console Port Other FeaturesGigabit Ethernet Module Slots 10/100/1000 PortsCisco TwinGig Converter Module LRMSystem LED LEDsStack LED Color System StatusStack Member LED Stack Master LEDUID and Health LEDs RJ-45 Uplink Port LEDsGigabit Ethernet Module Slot Port LEDs X2 Module Installed Only the CBS3120X SwitchManagement Options Power ConnectorsStackWise Plus Ports 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 ProblemsConfirm the Switch Module Connections Look at the Switch Module LEDsBad or Damaged Cable Ethernet and Fiber CablesPort and Interface Settings SFP Module Port IssuesPing the End Device Spanning Tree LoopsSpeed, Duplex, and Autonegotiation Verify the Switch Module PerformanceAutonegotiation and Network-Interface Cards Cabling DistanceReplacing 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 InterfacesGigabit Ethernet X2 Transceiver Module Cable Specifications Cable and Adapter SpecificationsConsole Port Microns MHz/km DistanceTransmit X2 Product Transmit Power Receive Power NumberDBm Wavelength nm Two Twisted-Pair Cable Pinouts SFP Module Cable Specifications1000BASE-SX GLC-SX-MMTP3 Four Twisted-Pair Cable Pinouts for 1000BASE-T PortsIdentifying a Crossover Cable Switch Console RJ-45-to-DB-9 Port DTEConsole Port Adapter Pinouts DeviceSwitch 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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