Flow Control Problems, Troubleshooting | Intel 10/100 instruction

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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Intel 10/100 manual Flow Control Problems, Troubleshooting

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 Manager Topology Overview Installation and Setup Intel Express 10/100 Fast Ethernet Switch Using the Switch Port status LEDsXmt Rcv Management status LEDs Link UTP requirements Cabling RequirementsFiber optic requirements Straight-through vs. crossover cables NIC RJ-45 MDI Determining which cable to use Typical Configurations Configuring the mixed 10 Mbps workgroup environment Configuration 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 remotely Entering commands Using the Console ManagerMeans you can type one of the following Vlan Console Manager command groups Procedures using this diagram Sample Console Manager Session Configuring the Snmp agent for IP Commands usedTo configure the Snmp agent Set the IP configuration. Type the command To configure a port for full duplex Configuring a port for full duplexRecommended environments Creating Virtual LANs VLANs To create an Svlan Create the two SVLANs. Type the commands To create a VBD Monitoring traffic To check traffic on a port Detecting faulty adapters or hub ports Detecting bad or poor quality cableDetecting congested segments Detecting speed mismatches Statistic Definitions Configuring and Managing the Switch Group to display commands relevant to that group Reference Console Commands Console Command-line SummarySystem Commands IP Commands Snmp Commands Switching Database Commands Virtual LAN Vlan Commands Spanning Tree Commands Port Configuration Commands Switching Statistics Commands Console Commands Help-kbdBanner Logout Set-passwd System CommandsSys-stat Warm-reset Cold-resetGet-stst-level Set-stst-level Init-nvram Set-line-slipGet-sw-file Set-sw-file Set-rsw-file Get-tftp-srvrSet-tftp-srvr Sw-dnld IP Commands IP configuration Get-bootp Set-bootpSet-ip Set-ip-conf Get-slip-conf Set-slipSet-slip-conf Get-gatew Ping Commands PingPing-stop Stops the active ping process. You can also press cC Address Resolution Protocol ARP Commands Get-arp-tblAdd-arp-entry Del-arp-entry Snmp Commands Snmp community stringsGet-comm Set-comm Snmp trap message commands Get-authSet-auth Get-traps Switching Database Commands Add-trapDel-trap Removes a station from the trap table Database control commands Get-lt-entry Get-lt-16 FF-FF-FF-FF-FF-FF Find-lt-addr Del-lt-entryDel-lt-addr Add-lt-entry Get-lt-age Custom filteringSet-lt-age Get-lt-filter Add-cf-entry Vlan Commands Del-cf-entryGet-nv-cftbl Displays the custom filter table stored in Nvram Get-con-matrix Get-vbc-matrix Set-vbc-domain Del-vbc-domainGet-vbc-tbl Set-sec-vlan Get-svlan-tbl Displays the table of defined SVLANsSet-mon-port Monitor Spanning Tree Commands Example Set-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-pcost Port Configuration Commands Use these commands to configure and display port settingsDisplays the current port configuration Get-port-cfg Statistics Commands Set-port-dplexSet-speed-sel Set-port-fctrl Get-eth-cnt Get-colls-cnt Get-rmon-cnt Get-sdist-cntDisplays the Rmon statistics packet size histogram for port Get-br-cnt 2905033 Bytes Received Get-mgm-brcnt Troubleshooting General Problems Flow Control Problems Troubleshooting Intel Express 10/100 Fast Ethernet Switch Default Configuration System Not installed see Accessories on next PortsConsole Manager Spanning tree Specifications FeaturesAccessories Status Indicators per port General Indicators Boot and ConfigurationConnector Interfaces Maximum Cabling Distances Electrical Specifications Power Cord SpecificationsElectromagnetic Emissions and Safety Agency Approval AC line frequency 47Hz-63Hz Fuse 100-120V/4A 200-240V/2A Snmp and MIB Support Limited Hardware Warranty Limited Hardware Warranty Europe only Avertissement Warnung Index Displaying current state, 44 enabling or disabling Get-authcommand Get-bootpcommandDatabase, switching Control commands Get-port-cfgcommand, 22 Get-slipcommandGet-stpcommand Get-trapscommand Set-commcommand MIB Set-stpcommand Set-slipcommandXmt Transmit LED How to access Troubleshooting Software updates Installation notesWorld Wide Web & Internet FTP Intel BBS