Cabletron Systems SmartCell 6A000 manual Traffic Management, Traffic Descriptors

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Traffic Management

Switch Administration

Note Do not change the VCC Mask for the CPU port (B4).

4.6TRAFFIC MANAGEMENT

This section describes how the SmartCell 6A000 ATM switch manages bandwidth and congestion. It briefly describes console commands that affect how the switch manages traffic. This section also provides guidelines for setting some traffic control parameters.

For information on troubleshooting congestion problems, see Chapter 5, "Troubleshooting."

The SmartCell 6A000 has extensive abilities for managing the flow of traffic. Traffic management includes all operations that insure optimum switch throughput, where throughput is based on rate of packet loss, available bandwidth, and traffic processing overhead. Under most conditions, the switch can efficiently and automatically manage traffic. However, if necessary, you can adjust the switch traffic management parameters. For example, it might be necessary to adjust parameters for a port that carries a large amount of CBR traffic or a very large number of simultaneous connections.

The SmartCell 6A000 console commands affect traffic flow on a per-QoS, per-port, and global basis. These console commands affect switch traffic flow by controlling

•Bandwidth allocation

•Call Admission Control (CAC) policies

•Class of service for a connection

•Buffer memory allocation

•Threshold settings for anti-congestion routines

Caution Do not change traffic control settings unless you have expert-level experience with ATM switching. Back up the switch configuration before making changes. Also, make notes of the changes you make to the traffic control parameters.

4.6.1Traffic Descriptors

Traffic characteristics of an ATM source are signaled through a set of traffic descriptors during connection establishment. The SmartCell 6A000 uses traffic descriptors for resource allocation during call set up, and guarantees the QoS across the connection. The source traffic descriptor is a set of parameters that describes the expected bandwidth utilization of a connection. You can set these parameters, which include

•Peak cell rate (PCR)

•Sustainable cell rate (SCR) and maximum burst size (MBS)

•Minimum cell rate (MCR) and initial cell rate (ICR) — through UNI4.0 signaling only

Traffic descriptors vary for each QoS. If a connection is bi-directional, a traffic descriptor has to be assigned to each direction and need not be the same in both directions.

4-18 SmartCell 6A000 User Guide

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Contents SmartCell 6A000 User Guide Order number Part number 04-0045-01 Rev. aIi 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 Switch Installation and Setup Unpacking the SwitchInspecting the Switch Check Accessory Carton Contents6A000-04 and 6A000-02 front panels Installing the Switch Mbps STS-3c/STM-1 UTP5, 4 PortsInstalling the Switch Installing the SmartCell 6A000 Configuring the Switch Adapters provided for connecting to the switch6A000 console and network connections Using the Console Console CommandsClient Adding and ModifyingEnter ServerAddress 390000000000000000001441800020d414418001 Console HelpUNIATMAddress 390000000000000000001441800020d414418000 IP Over ATM and Lane Creating AN IP Over ATM VlanATM Addressing for IP over ATM IpatmarpCreating AN Emulated LAN SmartCell ZX # add wellknownaddressELANType802.3 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 Upgrading Operating Software Path server.imaUnsuccessful Update Setting UP RoutesUsing the df Command to Recover Iisp Routing Creating Iisp RoutesSmartCell ZX # show netprefix a4 ATMAdress 39000000000000000000144780 SW2s netprefixATMAdress 39000000000000000000141500 SW3s netprefix Iisp Routes Among Multiple SwitchesATMAdress 39000000000000000000144180 SW1s netprefix Default Iisp Routes Iisp routes between multiple switchesFor example, create a default Iisp route from port B1 Iisp Routes and Network Topology112255 112244 Routing LoopsSigConfig and PortAutoDetect with Iisp Routing UNI RoutesIisp Metrics and Load Sharing UNIATMAddress 440000000000000000001441800030E514418000IP Routing Logs and Alarms To see the route, enter the show route command on SW2Log Message System How Log Messages and Alarm Messages DifferViewing and Filtering Messages Setting UP PVC Connections ConsoleConnecting to Local Client Through Point-to-Point PVC Point-to-Point PVCs100 10.1.1.0Point-to-Multipoint PVCs Non-zero VPIs Show vccmaskSmartCell ZX # set portconfig a1 SmartCell ZX # show portconfig a1Traffic Management Traffic Descriptors8000 5000Call Admission Control Policy Class of Service Queues # set cacparamsPortNumberALL 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 CPU Module Figure A-1 Front panelSwitch Modules MSM and ESM Input/Output Port ModulesModule TypeCharacteristics Port Numbering Figure A-3 Group and port identifiersFeatures Switch ModuleSignaling and Routing 3 I/O ModulesConnection Management LAN Servers and ClientsManagement ATM Forum LAN Emulation LaneTechnical Specifications SpecificationsPhysical Specifications ATM Port Specifications Standards SpecificationsCPU Serial Port Pin-Out Descriptions RJ-45 DB-25 Pin Color DescriptionTable A-11 RJ-45 to DB-25 Adapter Modem Adapter Appendix A-12 SmartCell 6A000 User Guide Appendix B Smartcell 6A000 and Snmp Internet MIB HierarchyZeitnet Proprietary MIB Figure B-1 Internet MIB HierarchyInterpreting the Object Identifier Figure B-2 ZeitNet Private MIBsProprietary MIB Functions Console Commands That Affect the Agent Client for Snmp ManagementMIB Exceptions Non-ConformanceNot Supported SmartCell 6A000 User Guide Appendix B-7 Page FAX Service Electronic ServicesAppendix C Technical Support Telephone AssistanceSoftware Warranty Hardware WarrantyRepair Services Appendix D Acronyms CAC CanCBR CcittDCC DTEDVT NETFCS FifoFTP IeeeIOM IP/ATMIPX ITU-TSSLES LeselanLIS LLCNetbeui NFSNIC NLSPDU PMDPMP PPDSaal SARSAR-PDU SBETaxi TCPTDM TftpVCC VCIVCL VlanAcronyms Appendix D-12 SmartCell 6A000 User Guide Add wellknownaddress command 3-6 Address IndexSetting up routes Vlan Index SmartCell 6A000 User Guide
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