Intel 10/100 manual Flow Control Problems, Troubleshooting

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C H A P T E R 4

Troubleshooting

1Incoming packets on Port 1 are destined for Port 2. However, Port 2’s buffer is filled.

2Port 1 sends a collision signal to the sending device, telling it to retransmit the packets. This allows Port 2 to clear its buffers.

3When Port 2’s buffer are cleared, retransmitted packets are forwarded to Port 2.

9Restore the switch’s defaults with the init-nvramcommand and then reset the switch with the cold-resetcommand.

Flow Control Problems

During times of peak network usage, you may occasionally see the Flow LED blink (for a description of the LED, see page 6). This is normal. However, if it stays lit for more than a few seconds at a time, or if the network management software reports an excessive number of flow controls, it might indicate a problem with your network configuration. Here’s how flow control works:

Port 1 buffer

Port 2 buffer

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Contents User Guide First edition Contents Chapter Troubleshooting Check the LEDs for power and links Connect the network devices to the switchNext steps Optional Baud Data bits No parity Stop bit Xon/Xoff flow control Press Eand log into the Console ManagerTopology OverviewInstallation and Setup Intel Express 10/100 Fast Ethernet SwitchUsing the Switch Port status LEDsXmt RcvManagement status LEDs LinkUTP requirements Cabling RequirementsFiber optic requirements Straight-through vs. crossover cables NIC RJ-45 MDIDetermining which cable to use Typical Configurations Configuring the mixed 10 Mbps workgroup environmentConfiguration 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 Accessing the Console Manager remotelyEntering commands Using the Console ManagerMeans you can type one of the following Vlan Console Manager command groups Procedures using this diagram Sample Console Manager SessionConfiguring the Snmp agent for IP Commands usedTo configure the Snmp agent Set the IP configuration. Type the commandTo configure a port for full duplex Configuring a port for full duplexRecommended environments Creating Virtual LANs VLANs To create an SvlanCreate the two SVLANs. Type the commands To create a VBDMonitoring traffic To check traffic on a port Detecting faulty adapters or hub ports Detecting bad or poor quality cableDetecting congested segments Detecting speed mismatchesStatistic Definitions Configuring and Managing the Switch Group to display commands relevant to that group ReferenceConsole Commands Console Command-line SummarySystem Commands IP Commands Snmp Commands Switching Database Commands Virtual LAN Vlan CommandsSpanning Tree Commands Port Configuration Commands Switching Statistics CommandsConsole Commands Help-kbdBanner LogoutSet-passwd System CommandsSys-stat Warm-reset Cold-resetGet-stst-level Set-stst-levelInit-nvram Set-line-slipGet-sw-file Set-sw-fileSet-rsw-file Get-tftp-srvrSet-tftp-srvr Sw-dnldIP Commands IP configurationGet-bootp Set-bootpSet-ip Set-ip-confGet-slip-conf Set-slipSet-slip-conf Get-gatewPing Commands PingPing-stop Stops the active ping process. You can also press cCAddress Resolution Protocol ARP Commands Get-arp-tblAdd-arp-entry Del-arp-entrySnmp Commands Snmp community stringsGet-comm Set-commSnmp trap message commands Get-authSet-auth Get-trapsSwitching Database Commands Add-trapDel-trap Removes a station from the trap tableDatabase control commands Get-lt-entryGet-lt-16 FF-FF-FF-FF-FF-FFFind-lt-addr Del-lt-entryDel-lt-addr Add-lt-entryGet-lt-age Custom filteringSet-lt-age Get-lt-filter Add-cf-entryVlan Commands Del-cf-entryGet-nv-cftbl Displays the custom filter table stored in NvramGet-con-matrix Get-vbc-matrixSet-vbc-domain Del-vbc-domainGet-vbc-tbl Set-sec-vlanGet-svlan-tbl Displays the table of defined SVLANsSet-mon-port MonitorSpanning Tree Commands ExampleSet-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-br-fwdel Set-prt-prioSet-prt-enb Set-prt-pcostPort Configuration Commands Use these commands to configure and display port settingsDisplays the current port configuration Get-port-cfgStatistics Commands Set-port-dplexSet-speed-sel Set-port-fctrlGet-eth-cnt Get-colls-cntGet-rmon-cnt Get-sdist-cntDisplays the Rmon statistics packet size histogram for port Get-br-cnt2905033 Bytes Received Get-mgm-brcnt Troubleshooting General Problems Flow Control Problems TroubleshootingIntel Express 10/100 Fast Ethernet Switch Default Configuration SystemNot installed see Accessories on next PortsConsole Manager Spanning treeSpecifications FeaturesAccessories Status Indicators per portGeneral Indicators Boot and ConfigurationConnector Interfaces Maximum Cabling DistancesElectrical Specifications Power Cord SpecificationsElectromagnetic Emissions and Safety Agency Approval AC line frequency 47Hz-63Hz Fuse 100-120V/4A 200-240V/2ASnmp and MIB Support Limited Hardware Warranty Limited Hardware Warranty Europe only Avertissement Warnung Index Displaying current state, 44 enabling or disablingGet-authcommand Get-bootpcommandDatabase, switching Control commandsGet-port-cfgcommand, 22 Get-slipcommandGet-stpcommand Get-trapscommandSet-commcommand MIBSet-stpcommand Set-slipcommandXmt Transmit LED How to access Troubleshooting Software updates Installation notesWorld Wide Web & Internet FTP Intel BBS