Cisco Systems 10008 quick start Troubleshooting Ethernet Connections, Switch configure terminal

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Troubleshooting Ethernet Connections

If an Ethernet connection to your Cisco 10008 router fails to work properly, and the corresponding LINK LED is not on, check for the following problems:

•Visually check that an Ethernet cable is connected to the correct Ethernet port on the PRE, and that the other end of the cable is connected to an Ethernet hub that is powered on and functioning properly.

•Check to see if you are using the correct type of cable. The cable must meet the specifications given in the “Connecting to a 10BASE-T Ethernet Network” section on page 31.

•Check if the cable might be bad or broken. Replace the cable with a known, reliable straight-through Ethernet cable, checking to be sure the LINK LED comes on (green).

If the LINK LED is still off, it is possible that the Ethernet port might be functioning properly, but the LED is not working. Check the Ethernet port (by trying to ping over it, for example) to determine if the problem is due to a bad LED or if the Ethernet link is bad.

•Make sure the PRE has booted up properly:

–The STATUS LED should be on (green).

–If the FAIL LED is on (yellow), see the Cisco 10000 Series Internet Router Troubleshooting Guide for troubleshooting information.

•Check the hub:

–Look to see if the cable is connected into the correct hub port (for example, the HUB LED is on, but the LINK LED on the PRE is not on).

–Be sure that the cable is not connected to an uplink port.

•If the LINK LED is on (green), but the Ethernet port does not seem to be working properly, make sure that the port in question is configured properly and is not administratively shut down. If you have a working console connection, perform the following steps:

–At the router prompt, enter show interface fast0/0/0. If the port is administratively down, enter these commands to enable it:

Switch> configure terminal

Enter configuration commands, one per line. End with CNTL/Z.

Router(config-if)# interface fast0/0/0

Router(config-if)# no shut

Router(config-if)# exit

Router(config)# exit

–Check that the Ethernet port in question has a valid IP address assigned to it.

For more information about configuring Ethernet ports, see the Cisco 10000 Series Router Line Card Configuration Guide.

If the cables, connections, power, and configuration are all acceptable, and you still cannot connect to the Ethernet port on the PRE, you probably need to replace the PRE. Contact Cisco Technical Support for further assistance.

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Contents Cisco 10008 Router Document Version History Documentation and ResourcesDocumentation Survey Related Documentation Obtaining DocumentationDocumentation Feedback Product Documentation DVDOrdering Documentation Reporting Security Problems in Cisco Products Cisco Product Security OverviewObtaining Technical Assistance Submitting a Service Request Definitions of Service Request SeverityCisco Technical Support & Documentation Website Obtaining Additional Publications and Information Site Preparation Preparing for InstallationRecommended Tools and Supplies Quantity Description CommentsInstalling the Router Lifting the Chassis Lifting the ChassisRack-Mounting the Router in a 19-Inch 4-Post Rack Power Fault Miswire30012 Attaches the chassis to the rack StepAution Rack-Mounting the Router in a 23-Inch 2-Post Rack30014 30015 Attaching the Cable-Management Bracket Attaching the Cable-Management BracketAttaching the Grounding Lug Attaching Grounding Wire to Grounding LugSuitable grounding is available. Statement Installing Line CardsConnecting Power Connecting DC Power to the Cisco 10008 RouterOr weld the metal object to the terminals. Statement Set the DC PEM switches to the Off position Removing the Safety Cover DC Power Connections Securing DC Power Cables to the Chassis Connecting AC Power to the Cisco 10008 RouterSetting AC PEM Switches to the Off Position AC Power Cord Connectors in Strain-Relief Devices Connecting Alarm Indicators Connecting CablesRemoving the Safety Cover Alarm Indicator Terminal Block Connections Alarm Indicator Wires Exiting the Safety Cover Connecting a Video Terminal to the PRE Console PortConsole Port Connection on the PRE Ethernet Network Management Cable Connections Connecting Network Management and Signal System CablesConnecting to a 100BASE-T Ethernet Network Correctly connected to the 100BASE-T Ethernet LAN Auxiliary Modem Connection Installing Network Cables to the Line CardsPower Fault Miswire Powering On the SystemConfiguring the Cisco 10008 Router at Startup Basic Configuration Using the Setup FacilityStartup Display Basic System Configuration Procedure Using the System Configuration DialogSpecify the IP address Routerconfig # interface FastEthernet0/0/0 Basic Configuration in Global Configuration ModeRouter# format disk0 Formatting Flash Disks and Flash CardsManaging the File Systems File SystemsCLI Name Description Managing Configuration Files Larger than Nvram Compressing the Configuration FileRelocating the Configuration to a Flash Disk Exit global configuration mode Troubleshooting Installation Problems General Troubleshooting TipsSymptom Steps to Take Switch configure terminal Troubleshooting Ethernet ConnectionsTroubleshooting the Console Port Serial Connection Page USA
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