Cisco Systems Cisco ME 3400 manual How to Clear the Switch IP Address and Configuration

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Chapter 3 Troubleshooting

How to Clear the Switch IP Address and Configuration

Check Switch Performance

Review this section when you troubleshoot switch 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 and a router, or between the switch 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 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 NIC Cards

Problems sometimes occur between the switch and third-party network interface cards (NICs). By default, the switch 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 autonegotation 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 card might be causing the problem. Upgrade the NIC card 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 to the connected device meets the recommended guidelines. See the “Cable and Adapter Specifications” section on page A-4for cabling guidelines.

How to Clear the Switch IP Address and Configuration

This section describes how to reset the switch by rerunning the initial configuration dialog (system configuration dialog). These are reasons why you might want to reset the switch:

•You installed the switch in your network and cannot connect to it because you assigned the wrong IP address.

•You want to clear all the configuration settings from the switch and assign a new IP address.

Cisco ME 3400 Ethernet Access Switch Hardware Installation Guide

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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 Purpose AudienceOrganization Conventions Related Publications OL-7677-04 Setting up the Switch Switch Models1describes the switch models Front Panel DescriptionCisco ME 3400-24TS AC and DC Switches Front Panel Cisco ME 3400-24TS AC Ethernet Access Switch Front PanelCisco ME 3400-24FS Switch AC Switch Front Panel Cisco ME 3400G-12CS AC and DC Switches Front PanelCisco ME 3400G-2CS Switch Front Panel System LED Dual-purpose ports Console port SFP module ports10/100 Ports Only the Cisco ME-3400-24TS Switches SFP Module Ports SFP ModulesLEDs SFP Module Patch CableSystem LED These illustrations show the location of the System LEDConsole Power Supply LEDs Only Cisco ME 3400G-12CS Switches Port LEDsConsole Port Dual-Purpose Port LEDsCisco ME 3400-24TS Switch Rear Panel Cisco ME 3400-24FS Switch Rear PanelCable lock Ground connector Fan exhaust Exhaust fan Cable lock Ground connectorPower Supply Features Cisco ME 3400G-12S Switch Rear PanelCisco ME 3400-2CS Switch Rear Panel Fan exhaust AC power connector Ground connectorCisco ME AC Switch Power Supply Cisco ME DC Switch Power SupplyNetwork Configurations Management OptionsPreparing for Installation This section covers these topicsSwitch Installation Preparing for Installation 122F 50C Statement Cisco ME 3400-24TS Switches Installation GuidelinesCisco ME 3400G-12CS Switches Verifying Switch Operation Installing the SwitchPowering Off the Switch This section describes these installation proceduresRemoving Screws from the Switch Rack-MountingAttaching Brackets to the Switch Rack-Mounting BracketsAttaching Brackets to 19-Inch Racks 191022 Attaching Brackets for 23-Inch Racks Attaching Brackets for 24-Inch Racks Attaching Brackets for Etsi Racks Mounting the Switch in a Rack Phillips machine screws Cable guide and screwWall-Mounting Attaching the Brackets to the Switch for Wall-MountingPhillips flat-head screws Mounting the Switch on a Wall 11 Mounting the Switch on a WallInstalling and Removing SFP Modules Table- or Shelf-MountingInstalling SFP Modules 12 SFP Module with a Bale-Clasp LatchRemoving SFP Modules Bale claspInserting and Removing the SFP Module Patch Cable Connecting to the 10/100 and 10/100/1000 Ports 17 Connecting to an Ethernet PortConnecting to Fiber-Optic SFP Modules Connecting to SFP ModulesLC connector Connecting to 1000BASE-T SFP Modules 19 Connecting to a 1000BASE-T SFP ModuleConnecting to Dual-Purpose Ports 20 Connecting to a Dual-Purpose PortWhere to Go Next Check Switch Post Results Diagnosing ProblemsThis section includes these troubleshooting topics Check Switch LEDs Check Switch ConnectionsBad or Damaged Cable Ethernet and Fiber CablesSFP Module Port Issues Port and Interface SettingsPing the End Device Spanning Tree LoopsHow to Clear the Switch IP Address and Configuration Check Switch PerformanceSpeed, Duplex, and Autonegotiation Autonegotiation and NIC CardsLocating the Switch Serial Number Serial Number Location on the Cisco ME 3400G-2CS SwitchSerial Number Location on the Cisco ME 3400G-2CS Switch These sections describe the connectors used with the switch Connector Specifications10/100 Ports Figure A-1 10/100 Port Pinouts Figure A-2 Fiber-Optic SFP Module LC Connector Dual-Purpose PortsCable and Adapter Specifications SFP Module Cable SpecificationsTwo Twisted-Pair Cable Pinouts Crossover Cable and Adapter Pinouts Four Twisted-Pair Cable Pinouts for 1000BASE-T PortsIdentifying a Crossover Cable TxD RxD Adapter PinoutsRxD TxD Switch Console RJ-45-to-DB-25 Port DTE Technical Specifications This appendix lists the switch technical specificationsAC Power Requirements Physical Dimensions OL-7677-04 Connecting to DC Power Preparing the Ground Wire Grounding the SwitchReview these safety warnings before you ground the switch Figure C-1 Stripping the Ground Wire Torque to 15 lbf-in Figure C-3 Torquing Ground-Lug ScrewsTelco rack Grounding wire Connecting the Grounding Wire to Earth GroundTelco rack Wiring the DC-Input Power Source Primary power feed Secondary redundant power feedCisco ME 3400G-12CS Switches Cisco ME 3400-24TS 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 Accessing the CLI Through the Console Port Starting the Terminal-Emulation SoftwareIP Settings Entering the Initial Configuration InformationCompleting the Setup Program Enter an enable secret password, and press Return Enter an enable password, and press ReturnEnter a virtual terminal Telnet password, and press Return Switch or as a standalone switchThese choices appear Auto-MDIX Pinouts See also connectors and cables cautions NumericsCisco IOS command-line interface CiscoView Connecting outside the building warningConnection procedures Connectors and cables 10/100 ports Console portInstalling SFP modules 2-17 to IN-3LEDs Running at power on Power Connecting to AC Connecting to DCPower on ConnectorsGround connection IN-5IN-6
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