Traffic Management | Cabletron Systems 04-0053-01 manual

6 TRAFFIC MANAGEMENT

6.1TRAFFIC MANAGEMENT CAPABILITIES

ATM SmartSwitches have extensive abilities for managing traffic flow. Traffic management includes all operations performed by the ATM SmartSwitch that ensures optimum switch throughput, where throughput is based on rate of packet loss, available bandwidth, and traffic processing overhead. Under most conditions, an ATM SmartSwitch can efficiently and automatically manage switch 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.

ATM SmartSwitches provide console commands that affect traffic flow on a global, port, or category of service level. These console commands affect switch traffic flow by controlling

•Bandwidth allocation

•Call Admission Control (CAC) policies

•The service category 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.

6.1.1Traffic Descriptors

Traffic characteristics of an ATM source are signaled through a set of traffic descriptors during connection establishment. ATM SmartSwitches use traffic descriptors for resource allocation during call set up to guarantee the quality of service (QoS) across the connection. The source traffic descriptor is a set of parameters that describes the expected class of service and bandwidth utilization of a connection. Depending on the class of service specified in the traffic descriptor you can set the following parameters:

•Peak Cell Rate (PCR)

•Sustainable Cell Rate (SCR)

•Maximum Burst Size (MBS)

•Minimum Cell Rate (MCR) — signaled through UNI4.0 signaling only

•AAL type

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.

SmartSwitch ATM User Guide 6-1

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Cabletron Systems 04-0053-01 manual Traffic Management Capabilities, Traffic Descriptors

Contents

Part Number 04-0053-01 Rev. a Order Number SmartSwitch ATM Switch User Guide Ii SmartSwitch ATM Switch User Guide FCC Class a Notice Manufacturer’s Name Application of Council DirectivesManufacturer’s Address Product Name Safety Information Class 1 Laser Transceivers Fiber Optic Protective Caps Regulatory Compliance Summary Safety Document Name Revision History Table of Contents Virtual Ports and Static Connections Index Table of Contents Xii SmartSwitch ATM User Guide List of Figures List of Figures Xiv SmartSwitch ATM User Guide List of Tables List of Tables Xvi SmartSwitch ATM User Guide Introduction Contents of the User Guide Smartswitch ATM Switch Differences Creating AN IP Over ATM Vlan IP Over ATM and LaneIP address is for example only Subnet mask is for example only Creating an IP over ATM Vlan IP Over ATM and Lane Default Netprefix for SmartSwitch 2500 Family Switches Default ATM Addressing for IP over ATMDefault Netprefix for SmartSwitch Default IP Over ATM Local Client Address Creating AN Emulated LAN Ilmi ATM Addressing for LAN Emulation SmartSwitch 2500 Family Default Lane Addressing Lecs address is constructed from SmartSwitch 6500 Default Lane AddressingChassis MAC address = 0020D4144180 Then CPU MAC address = 0020D4144180 Elan number = Then Chassis MAC address = 00001DA3870B Then ELANs Across Multiple SwitchesChassis MAC address = 00001DA3870B Elan number = Then Distributed Lane Services Switch ClientsJust for this example Specify the LES address on SW2 Use the add leselan command to create an LES on switch SW2 Best Effort Elan Join Test Elan Join PoliciesSW1 # show client By Route Descriptor By MAC Address Lecselanlec Table Weight the policy atUse ? to see possible types Physical Versus Logical BUS Multicasting Lane Over WAN CircuitsNo MAC address is specified Elan is specified by Elan number Single PVP connection between clients and Lane services Lane Service Redundancy Using Lnni Lnni Redundant LECSs on same network Lane Load Sharing Lnni call set up load sharing How Lnni handles Elan join requests Setting up Lnni LECs SW1 # stop les SW1 # stop lecsSW1 # set lnniinfo SW2# set lnniinfo Similarly, create the same Elan elan1 on SW2 On SW1, create an Elan in this example, we create elan1SW1 # add elan SW2 # add elan SW2 # show elan Configuring Lnni Distributed LES/BUS ServersSW1 # show lecsneighborinfo On switch SW3, use the set lnniinfo to configure Lnni SW3 # start les LES SW1 # show lecsserverlistPage SmartSwitch 2500 Family Default Node ID Default Pnni AddressingSmartSwitch 6500 Family Default Node ID Pnni Routing SmartSwitch 6500 Default Node ATM Address SmartSwitch 2500 Family Default Node ATM Address MULTI-LEVEL Pnni Topology Connecting Multiple Peer Groups Change the tenth byte to SWA1 # set pnnipeergroupid Specifies node number Do the same for switch SWB3Highest priority in election process SWB3 # set pnnipglelection Do the same on switch SWB3SWA3 # show pnnipglelection Adding Higher-level Peer Groups Physical Connections Between Peer Groups Adding a third Pnni node for next level connectivity Managing Parallel Pnni Links SmartSwitch # show pnniinterface 7b2 Link on switch SWA2 comes from this port Perform the same operation on switch SWB2 in group B4a3 Link on switch SWB2 comes from this port Aggregation Tokens Aggregation token values and parallel links Pnni Link Timing SmartSwitch # set linkmonitortimeout Additional Routing Protocols RoutingIisp Routes This is an exterior route Iisp Routing Considerations Iisp Routing Example Two Iisp Routing Example One Iisp Link Timing Set linkmonitortimeout UNI Routes Take the default to make this an internal routeYes Advertise this address into the Pnni domain UNI Link Timing Route Metrics Administrative WeightsCreating Route Metrics Create the incoming member of the metric pair Create the outgoing member of the metric pairEnter show pnnimetric to view the newly created metric pair 6b2 IP Routing for ManagementIndex tag of our metric pair 90.1.1.254 Route NET Table To see the route, enter the show route command on SW2 Virtual Ports and Static Connections SmartSwitch # add trafficdescriptorPVC Connections Point-to-Point PVCs Specify first port Point-to-Multipoint PVCsSpecify its Vpci Specify its VCI Perform for ports 7a3 and 7a4 Take the default valuesSet PCRCLP01 to zero Connect the end node to port 7a1 of the ATM SmartSwitch Connecting to Local Switch Client Through a PVCUse add ipatmclient to create an IP over ATM local client Set client number PVP Connections Turn off signalingTurn off Ilmi 7b1 Use the show pvp command to display the PVP connectionSee note below Specify the first port Virtual Ports Connecting PVPs7a1.3, 5b2.3, A1.3, C5.3, and so on Available VPIs = 2MaxVpiBits Creating Virtual Ports Default MaxVciBits = Default MaxVpiBits =Instance of set portconfig Set to 1 this translates to VPIs = 2 1-1 = VPIs used = Base VPI + 2 0 1 = 1 + 0 = .1 means our Base VPI is oneMaxVciBits decrements by Specify virtual port number and Base VPI Soft PVC and PVP Connections Things To Watch Out For When Creating Virtual PortsSoft PVC and Soft PVP differences Creating a soft PVC Making Soft PVC and PVP Connections 6b3 Port on target switch SmartSwitch # add spvcaddressSmartSwitch # show spvcaddress 102 7a1 Port on source switch Creating a Soft PVP We use VPI= SmartSwitch # show spvp PortNumberALL Soft PVC and PVP Connections Traffic Management Capabilities Traffic ManagementTraffic Descriptors PeakCellRate CLP0+1 No Traffic DescriptorPeakCellRate CLP0+1, PeakCellRate CLP0 PeakCellRate CLP0+1, PeakCellRate CLP0, Tag CLP = Call Admission Control Policy SmartSwitch # set cacserviceclassbw SmartSwitch # set caceqbwallocschemeUbr CPU UBR Queue Buffers Corresponds to CBR 7a3MinIndex for SmartSwitch # set switchtrafficcongestion SmartSwitch # show switchtrafficcongestionEFCI, EPD, and RM Cell Marking Traffic Management Capabilities Update Firmware Commands Firmware Upgrades and Bootline CommandsUnsuccessful Update IP address of Tftp server Enter the go command to start the ATM SmartSwitch Bootline Commands=df s Accessing the Bootline Prompt Bootline Commands Explanations Scsm Changes the slave TSM/CPU to the masterSwms =df b Upgrading Boot Load firmware Changing the Default Boot Load Image Upgrading Post Diagnostic firmware=chpi =df p Bootline CommandsFirmware Upgrades and Bootline Commands Upgrading Switch Operating firmware Start the ATM SmartSwitch by entering the go command Bootline Commands Port ATM Address Filters ATM Filtering and ClockingCreating ATM Address Filters How ATM Address Filters Work Source and Destination Address Masks ATM Address Filter Example Filter Considerations Regarding Lane and IP over ATM Port Clock ConfigurationFFFFFFFFFFFFFFFFFFFF00000000000000000000 Network Clocking Troubleshooting IP Over ATM Troubleshooting Troubleshooting LAN Emulation Switches in Same Peer Group Troubleshooting Pnni LinksSwitches in Different Peer Groups Diagnosing Congestion Troubleshooting CongestionGlobal Congestion Fewer than 100 connections on a port Min = 64, Max = Port Congestion Event Categories Events and Alarms SmartSwitch # set eventdisplay Viewing Events and Alarms SmartSwitch # set alarmdisplay Deleting Events and Alarms Password Login name on the serverSaving Core Dumps IP address of my Tftp server Saving Core Dumps MIB, SMI, MIB Files and Internet MIB Hierarchy Appendix a Agent Support MIB, SMI, MIB Files and Internet MIB Hierarchy CSI ZeitNet Proprietary MIBs Relation Between Object Identifier and the Represented Value Supported SMI Formats Supported protocolsCSI ZeitNet Proprietary MIB Groups Ctron MIB Exceptions ATM SmartSwitch MIB SupportNon-Conformance Console Commands that Affect the Agent Managing AN ATM SmartswitchNot Supported Update firmware Backup Restore Reboot Default Community Strings Electronic Services FAX ServiceAppendix B Technical Support Telephone Assistance Software Warranty Hardware WarrantyRepair Services Index Accessing the boot load prompt 12,4-4,4-6 Iisp routing considerations Fail-over timing Route type parameter ZnPortTrafficCongTable ZnSwitchDiscoveryTableMulti-level Pnni topology PNN Enabling RM cell marking Changing EPD thresholds Vlan