Monitoring traffic | Intel 10/100 guide

C H A P T E R 2

Configuring and Managing the Switch

Monitoring traffic

Use monitoring commands to determine the traffic volume from specific ports or between ports. This information helps you determine the network’s traffic patterns so you can adjust your network topology for maximum efficiency.

Make sure you get a good statistical representation of your network. Take a reading when users log on in the morning and pull files from servers and another during breaks or when users log off at night—any time you think the network is experiencing heavy traffic. This gives you a baseline for comparison when problems arise on the network.

Statistics are generated for the current session. Reset counters by using the clr-cntcommand, warm-resetcommand, or by cycling the power.

In general, keep devices that talk primarily to each other on the same segment (remember, each port is an Ethernet segment). For example, if a high volume of traffic is forwarded from the CD server on port 4 to the payroll workgroup on port 3, but no other workgroups access the CD server, move the server to the hub on port 3 instead of the switch. This change may not be efficient, however, if users from the payroll, marketing, or finance workgroups also access the CD server.

Under heavy traffic loading conditions, the Console Manager may understate the Ethernet statistical counts. You can also use a protocol analyzer to monitor the segment the port is attached to. See step 8 on page 72 for configuration details.

Commands used

get-br-cnt <port> get-eth-cnt <port> get-colls-cnt <port>

Displays the packet statistics for a port.

Displays the Ethernet statistics for a port.

Displays the collision distribution counters for a port.

get-rmon-cnt <port> Displays the Ethernet RMON counters for a port.

get-sdist-cnt <port>

get-mgm-brcnt clr-cnt

Displays the packet size distribution counters for a port.

Displays the statistics for the SNMP agent.

Resets the Ethernet and bridging statistics.

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Intel 10/100 manual Monitoring traffic

Contents

User Guide First edition Contents Chapter Troubleshooting Next steps Optional Connect the network devices to the switchCheck the LEDs for power and links Press Eand log into the Console Manager Baud Data bits No parity Stop bit Xon/Xoff flow control Overview Topology Intel Express 10/100 Fast Ethernet Switch Installation and Setup Port status LEDs Using the SwitchXmt Rcv Link Management status LEDs Fiber optic requirements Cabling RequirementsUTP requirements NIC RJ-45 MDI Straight-through vs. crossover cables Determining which cable to use Configuring the mixed 10 Mbps workgroup environment Typical Configurations 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 One repeater hop for Repeater count limitationsGeneral rule for Configuring Accessing the Console Manager remotely Accessing the Console Manager Means you can type one of the following Using the Console ManagerEntering commands Vlan Console Manager command groups Sample Console Manager Session Procedures using this diagram Commands used Configuring the Snmp agent for IPTo configure the Snmp agent Set the IP configuration. Type the command Recommended environments Configuring a port for full duplexTo configure a port for full duplex To create an Svlan Creating Virtual LANs VLANs To create a VBD Create the two SVLANs. Type the commands Monitoring traffic To check traffic on a port Detecting bad or poor quality cable Detecting faulty adapters or hub portsDetecting congested segments Detecting speed mismatches Statistic Definitions Configuring and Managing the Switch Reference Group to display commands relevant to that group System Commands Console Command-line SummaryConsole Commands IP Commands Snmp Commands Virtual LAN Vlan Commands Switching Database Commands Spanning Tree Commands Switching Statistics Commands Port Configuration Commands Help-kbd Console CommandsBanner Logout Sys-stat System CommandsSet-passwd Cold-reset Warm-resetGet-stst-level Set-stst-level Set-line-slip Init-nvramGet-sw-file Set-sw-file Get-tftp-srvr Set-rsw-fileSet-tftp-srvr Sw-dnld IP configuration IP Commands Set-bootp Get-bootpSet-ip Set-ip-conf Set-slip Get-slip-confSet-slip-conf Get-gatew Ping Ping CommandsPing-stop Stops the active ping process. You can also press cC Get-arp-tbl Address Resolution Protocol ARP CommandsAdd-arp-entry Del-arp-entry Snmp community strings Snmp CommandsGet-comm Set-comm Get-auth Snmp trap message commandsSet-auth Get-traps Add-trap Switching Database CommandsDel-trap Removes a station from the trap table Get-lt-entry Database control commands FF-FF-FF-FF-FF-FF Get-lt-16 Del-lt-entry Find-lt-addrDel-lt-addr Add-lt-entry Set-lt-age Custom filteringGet-lt-age Add-cf-entry Get-lt-filter Del-cf-entry Vlan CommandsGet-nv-cftbl Displays the custom filter table stored in Nvram Get-vbc-matrix Get-con-matrix Del-vbc-domain Set-vbc-domainGet-vbc-tbl Set-sec-vlan Displays the table of defined SVLANs Get-svlan-tblSet-mon-port Monitor Example Spanning Tree Commands Get-st-bcfg Get-stpSet-stp Displays the spanning tree state for all ports Get-st-pcfgGet-st-syscfg Set-br-hellot Set-br-prioSet-br-maxage Set-prt-prio Set-br-fwdelSet-prt-enb Set-prt-pcost Use these commands to configure and display port settings Port Configuration CommandsDisplays the current port configuration Get-port-cfg Set-port-dplex Statistics CommandsSet-speed-sel Set-port-fctrl Get-colls-cnt Get-eth-cnt Get-sdist-cnt Get-rmon-cntDisplays the Rmon statistics packet size histogram for port Get-br-cnt 2905033 Bytes Received Get-mgm-brcnt Troubleshooting General Problems Troubleshooting Flow Control Problems Intel Express 10/100 Fast Ethernet Switch System Default Configuration Ports Not installed see Accessories on nextConsole Manager Spanning tree Features SpecificationsAccessories Status Indicators per port Boot and Configuration General IndicatorsConnector Interfaces Maximum Cabling Distances Power Cord Specifications Electrical 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 Displaying current state, 44 enabling or disabling Index Get-bootpcommand Get-authcommandDatabase, switching Control commands Get-slipcommand Get-port-cfgcommand, 22Get-stpcommand Get-trapscommand MIB Set-commcommand Xmt Transmit LED Set-slipcommandSet-stpcommand World Wide Web & Internet FTP Intel BBS Troubleshooting Software updates Installation notesHow to access