Intel 10/100 manual Detecting faulty adapters or hub ports, Detecting bad or poor quality cable

Page 31

C H A P T E R 2

Configuring and Managing the Switch

Interpreting Statistics

Detecting faulty adapters or hub ports

If Too Long errors or Jabbers (packets that are too long and misaligned) occur consistently on a port, the connected node may have a faulty adapter or port.

If the adapter works properly in other computers, there are other possible causes you can check:

•Is the cable connecting the node too long? UTP cable can’t exceed 100 meters and must be CAT 5 when running at 100 Mbps.

•Is there a duplex mismatch with the switch? If a switch port is set to full duplex and connected to a node set to half duplex, or vice versa, you could see problems. Hubs such as the Intel Express Stackable hub can only be half duplex.

Detecting bad or poor quality cable

If a high percentage of CRC Errors with respect to Transmit OK occur, it could indicate poor quality cable or a noisy environment. Test the cable with a cable tester or try a different cable.

Detecting congested segments

If a high percentage of Exces Coll Errors or Exces Fctrl Errors with respect to Transmit OK occur, it could indicate a congested segment. Balance the traffic load by moving the destination devices to local segments. If the port is attached to a workstation, server, or switch (not a repeater), change the connection to full duplex mode.

Detecting speed mismatches

If a high amount of Alignment Errors, Runt Errors, or Too Long

Errors occur, it could indicate a speed mismatch. Check the speed of the port and all devices connected to that segment.

27

Image 31

Contents User Guide First edition Contents Chapter Troubleshooting Check the LEDs for power and links Connect the network devices to the switchNext steps Optional Press Eand log into the Console Manager Baud Data bits No parity Stop bit Xon/Xoff flow controlOverview TopologyIntel Express 10/100 Fast Ethernet Switch Installation and SetupRcv Using the SwitchPort status LEDs XmtLink Management status LEDsUTP requirements Cabling RequirementsFiber optic requirements NIC RJ-45 MDI Straight-through vs. crossover cablesDetermining which cable to use Configuring the mixed 10 Mbps workgroup environment Typical ConfigurationsConfiguration guidelines A P T E R 1 Intel Express 10/100 Fast Ethernet Switch Full duplex and flow control between Express 10/100 switches General rule for Repeater count limitationsOne repeater hop for Configuring Accessing the Console Manager remotely Accessing the Console ManagerEntering commands Using the Console ManagerMeans you can type one of the following Vlan Console Manager command groups Sample Console Manager Session Procedures using this diagramSet the IP configuration. Type the command Configuring the Snmp agent for IPCommands used To configure the Snmp agentTo configure a port for full duplex Configuring a port for full duplexRecommended environments To create an Svlan Creating Virtual LANs VLANsTo create a VBD Create the two SVLANs. Type the commandsMonitoring traffic To check traffic on a port Detecting speed mismatches Detecting faulty adapters or hub portsDetecting bad or poor quality cable Detecting congested segmentsStatistic Definitions Configuring and Managing the Switch Reference Group to display commands relevant to that groupConsole Commands Console Command-line SummarySystem Commands IP Commands Snmp Commands Virtual LAN Vlan Commands Switching Database CommandsSpanning Tree Commands Switching Statistics Commands Port Configuration CommandsLogout Console CommandsHelp-kbd BannerSet-passwd System CommandsSys-stat Set-stst-level Warm-resetCold-reset Get-stst-levelSet-sw-file Init-nvramSet-line-slip Get-sw-fileSw-dnld Set-rsw-fileGet-tftp-srvr Set-tftp-srvrIP configuration IP CommandsSet-ip-conf Get-bootpSet-bootp Set-ipGet-gatew Get-slip-confSet-slip Set-slip-confStops the active ping process. You can also press cC Ping CommandsPing Ping-stopDel-arp-entry Address Resolution Protocol ARP CommandsGet-arp-tbl Add-arp-entrySet-comm Snmp CommandsSnmp community strings Get-commGet-traps Snmp trap message commandsGet-auth Set-authRemoves a station from the trap table Switching Database CommandsAdd-trap Del-trapGet-lt-entry Database control commandsFF-FF-FF-FF-FF-FF Get-lt-16Add-lt-entry Find-lt-addrDel-lt-entry Del-lt-addrGet-lt-age Custom filteringSet-lt-age Add-cf-entry Get-lt-filterDisplays the custom filter table stored in Nvram Vlan CommandsDel-cf-entry Get-nv-cftblGet-vbc-matrix Get-con-matrixSet-sec-vlan Set-vbc-domainDel-vbc-domain Get-vbc-tblMonitor Get-svlan-tblDisplays the table of defined SVLANs Set-mon-portExample Spanning Tree CommandsSet-stp Get-stpGet-st-bcfg Get-st-syscfg Get-st-pcfgDisplays the spanning tree state for all ports Set-br-maxage Set-br-prioSet-br-hellot Set-prt-pcost Set-br-fwdelSet-prt-prio Set-prt-enbGet-port-cfg Port Configuration CommandsUse these commands to configure and display port settings Displays the current port configurationSet-port-fctrl Statistics CommandsSet-port-dplex Set-speed-selGet-colls-cnt Get-eth-cntGet-br-cnt Get-rmon-cntGet-sdist-cnt Displays the Rmon statistics packet size histogram for port2905033 Bytes Received Get-mgm-brcnt Troubleshooting General Problems Troubleshooting Flow Control ProblemsIntel Express 10/100 Fast Ethernet Switch System Default ConfigurationSpanning tree Not installed see Accessories on nextPorts Console ManagerStatus Indicators per port SpecificationsFeatures AccessoriesMaximum Cabling Distances General IndicatorsBoot and Configuration Connector InterfacesAC line frequency 47Hz-63Hz Fuse 100-120V/4A 200-240V/2A Electrical SpecificationsPower Cord Specifications Electromagnetic Emissions and Safety Agency ApprovalSnmp and MIB Support Limited Hardware Warranty Limited Hardware Warranty Europe only Avertissement Warnung Displaying current state, 44 enabling or disabling IndexControl commands Get-authcommandGet-bootpcommand Database, switchingGet-trapscommand Get-port-cfgcommand, 22Get-slipcommand Get-stpcommandMIB Set-commcommandSet-stpcommand Set-slipcommandXmt Transmit LED How to access Troubleshooting Software updates Installation notesWorld Wide Web & Internet FTP Intel BBS