Cabletron Systems SmartCell 6A000 manual Troubleshooting Congestion, Diagnosing Congestion

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Troubleshooting

TroubleshootingCongestion

5.Check whether BUS is connected.

•Use show busclient to check whether devices are registered with the BUS. If clients are registered, check end node configuration. If not registered, check MP signaling.

•Use set leselan to turn off MP signaling on a per-ELAN basis.

-Do devices begin to register with the LES and BUS once MP signaling is turned off?

•Check IISP routes to the switch containing the LES and BUS.

-Are all IISP routes correct?

-Does a new IISP route need to be added so devices can reach the LES and BUS?

6.If working through these questions does not solve the problem, contact Cabletron Systems Customer Service. (See Appendix C, "Technical Support." )

5.3TROUBLESHOOTING CONGESTION

If the bandwidth of your SmartCell 6A000 begins to decrease, and if connections are being lost or packets are being dropped at a high rate, it's possible that your switch is becoming congested. Congestion can occur on the port level, the global switch level, or both levels.

If you suspect that your SmartCell 6A000 switch is congested, follow the steps outlined below to diagnose and resolve the cause of congestion.

5.3.1Diagnosing Congestion

1.Enter the show portstats command, and take the default of all.

2.If cells are not being dropped on all ports, proceed to the "Port Congestion" section.

3.If cells are being dropped on all ports, the indication is global congestion. Proceed to the "Global Congestion" section.

5.3.2Global Congestion

1.Is the total cell drop rate equal to the Unknown VC cell drop rate?

•If yes, the switch is improperly set up. Check the switch configuration.

•If no, this indicates global congestion. Continue.

2.Set the porttrafficcongestion values to those recommended in the "Class of Service Queue Allocation Guidelines" section. Has the congestion subsided?

•If yes, you are done.

•If no, continue.

3.Have you changed the EPD threshold?

•If yes, replace it to the default setting. If congestion subsides, you are done.

•If no, continue.

SmartCell 6A000 User Guide 5-3

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Contents Order number Part number 04-0045-01 Rev. a SmartCell 6A000 User GuideIi SmartCell 6A000 User Guide FCC Class a Notice Declaration of Conformity Addendum Safety Information Class 1 Laser Transceivers Fiber Optic Protective Caps Regulatory Compliance Summary Safety Revision History Table of Contents Troubleshooting Acronyms Index Table of Contents Xii SmartCell 6A000 User Guide List of Figures List of Figures Xiv SmartCell 6A000 User Guide List of Tables List of Tables Xvi SmartCell 6A000 User Guide Introduction Introduction SmartCell 6A000 User Guide Unpacking the Switch Switch Installation and SetupInspecting the Switch Check Accessory Carton Contents6A000-04 and 6A000-02 front panels Mbps STS-3c/STM-1 UTP5, 4 Ports Installing the SwitchInstalling the Switch Installing the SmartCell 6A000 Adapters provided for connecting to the switch Configuring the Switch6A000 console and network connections Console Commands Using the ConsoleClient Adding and ModifyingEnter ServerAddress 390000000000000000001441800020d414418001 Console HelpUNIATMAddress 390000000000000000001441800020d414418000 Creating AN IP Over ATM Vlan IP Over ATM and LaneIpatmarp ATM Addressing for IP over ATMSmartCell ZX # add wellknownaddress Creating AN Emulated LANELANType802.3 The default Ethernet is used ATM Addressing for LAN Emulation Switch Clients ELANs Across Multiple SwitchesElan1 Backing UP and Restoring Switch Configuration Switch AdministrationPath /backdir/config-1 Path server.ima Upgrading Operating SoftwareUnsuccessful Update Setting UP RoutesUsing the df Command to Recover Creating Iisp Routes Iisp RoutingSmartCell ZX # show netprefix a4 ATMAdress 39000000000000000000144780 SW2s netprefixATMAdress 39000000000000000000141500 SW3s netprefix Iisp Routes Among Multiple SwitchesATMAdress 39000000000000000000144180 SW1s netprefix Iisp routes between multiple switches Default Iisp RoutesIisp Routes and Network Topology For example, create a default Iisp route from port B1Routing Loops 112255 112244UNI Routes SigConfig and PortAutoDetect with Iisp RoutingIisp Metrics and Load Sharing UNIATMAddress 440000000000000000001441800030E514418000IP Routing To see the route, enter the show route command on SW2 Logs and AlarmsLog Message System How Log Messages and Alarm Messages DifferViewing and Filtering Messages Console Setting UP PVC ConnectionsPoint-to-Point PVCs Connecting to Local Client Through Point-to-Point PVC100 10.1.1.0Point-to-Multipoint PVCs Show vccmask Non-zero VPIsSmartCell ZX # show portconfig a1 SmartCell ZX # set portconfig a1Traffic Descriptors Traffic Management5000 8000Call Admission Control Policy # set cacparams Class of Service QueuesPortNumberALL Port ID Queue SmartCell ZX # show switchtrafficcongestion Class of Service Queue Allocation GuidelinesEFCI, EPD, and RM Thresholds Traffic Management Troubleshooting IP Over ATM TroubleshootingLogprint off command Troubleshooting LAN Emulation Diagnosing Congestion Troubleshooting CongestionGlobal Congestion Port Congestion Troubleshooting TroubleshootingCongestion Troubleshooting Congestion Hardware Components Appendix a Features and SpecificationsFront Panel Figure A-1 Front panel CPU ModuleInput/Output Port Modules Switch Modules MSM and ESMModule TypeCharacteristics Figure A-3 Group and port identifiers Port NumberingSwitch Module FeaturesSignaling and Routing 3 I/O ModulesLAN Servers and Clients Connection ManagementManagement ATM Forum LAN Emulation LaneTechnical Specifications SpecificationsPhysical Specifications Standards Specifications ATM Port SpecificationsRJ-45 DB-25 Pin Color Description CPU Serial Port Pin-Out DescriptionsTable A-11 RJ-45 to DB-25 Adapter Modem Adapter Appendix A-12 SmartCell 6A000 User Guide Internet MIB Hierarchy Appendix B Smartcell 6A000 and SnmpFigure B-1 Internet MIB Hierarchy Zeitnet Proprietary MIBFigure B-2 ZeitNet Private MIBs Interpreting the Object IdentifierProprietary MIB Functions Client for Snmp Management Console Commands That Affect the AgentMIB Exceptions Non-ConformanceNot Supported SmartCell 6A000 User Guide Appendix B-7 Page Electronic Services FAX ServiceAppendix C Technical Support Telephone AssistanceSoftware Warranty Hardware WarrantyRepair Services Appendix D Acronyms Can CACCBR CcittDTE DCCDVT NETFifo FCSFTP IeeeIP/ATM IOMIPX ITU-TSSLeselan LESLIS LLCNFS NetbeuiNIC NLSPMD PDUPMP PPDSAR SaalSAR-PDU SBETCP TaxiTDM TftpVCI VCCVCL VlanAcronyms Appendix D-12 SmartCell 6A000 User Guide Index Add wellknownaddress command 3-6 AddressSetting up routes Vlan Index SmartCell 6A000 User Guide