Multiple Simultaneous Conversations | Cabletron Systems STS16-20D

18

Multiple Simultaneous Conversations

A limitation of Token Ring is that it supports only one packet at a time. The SmartStack STS16-20D/STS16-20R improves data throughput by supporting multiple, simultaneous, full-duplex conversations. By using High-Speed bus switching technology, the SmartStack STS16-20D/STS16-20R creates multiple data paths. These switched connections between Token Ring segments last only for the duration of a byte transmission. New connections are made “on-the-fly” between different ports on the switch for the next byte.

Figure 5. Multiple Conversations Through a SmartStack

STS16-20RM Switch

For example, as shown in Figure 5, while host A is transmitting a byte to host B, the SmartStack STS16-20D/STS16-20R connects only the lines from A to B since there is no need to send packets to all other ports. At the same time, a second switching circuit can connect host C to host D. The result: Two packets are sent simultaneously.

➽Note: The SmartStack STS16-20D/STS16-20R transmits broadcast and multicast packets on several SmartStack STS16-20D/STS16-20R ports simultaneously.

SmartStack STS16-20D/STS16-20R Token Ring Switches Installation and User Guide

Switch Overview

Image 32

Cabletron Systems STS16-20D, STS16-20R manual Multiple Simultaneous Conversations

Contents

Page Page Order Number 9032956-01 OC-7054 v .1 Industry Canada Notice FCC NoticeVcci Notice Application of Council Directives 89/336/EEC 73/23/EEC Declaration of Conformity AddendumIii Table of Contents Preparing for Installation Installation Accessing Switch Management Switch Configuration Vii Monitoring the Network from the Console StatisticsMenu 155 Troubleshooting 215 Monitoring the Network with Snmp 201Monitoring Port Traffic 211 Viii Getting in Touch with Technical Support 221 List of Figures List of Tables Xii SmartStack STS16-20D Token Ring Switch Introduction Switching Technology Switch of Switches Switch of Desktops Switch of ServersSwitch of Hubs Switch of Floors and Buildings Switch of Routers Token Ring Ports Front Panel DetailsManagement Port System Request Button Reset ButtonSwitched Port Analyzer State Meaning LabelsStatus and Activity LEDs Lists the stack-link LEDs and their meanings Connection has been established to the stackLists the port LEDs and their meanings Token Ring port is inserted into the ring Back panel of the switches are illustrated Lists the back panel connectors on the switchBack Panel Details Name Description Performance and Advanced Features Features and SpecificationsFeatures Management Scalability and High Availability Installation Specifications Capacity Performance Specifications Performance Physical Characteristics Specification Value Protocol compatibility Spanning Tree ProtocolSupport On SmartStack STS16-20D only for Ports 17 to MIBs supported Switch Overview Multiple Simultaneous Conversations Low Latency Address Management SmartStack STS16-20D Token Ring SwitchSmartStack STS16-20R Token Ring Switch Multiple Bridging Modes Source Route Switching SRS Source Route Bridging SRB Source Route Transparent SRT SRT/SRB Filtering Congestion Control Three Switching Modes Cut-ThroughStore and Forward Auto Adaptive Cut-Through Token Ring Port Operation Modes RI/RO-Like Connection on SmartStack STS16-20R Transmission Priority Queues ClearSession Support CrossLink Connections Spanning Tree Protocol Support Vlan Support Vlan Dynamic Source Route Recovery Example of Dynamic Source Route Recovery, Base Configuration Example of Dynamic Source Route Recovery, Normal State Example of Dynamic Source Route Recovery, Switch 1 Failed Specification Management IBM LAN Network Manager SmartStack Manager for WindowsTelnet Management and VT100 Management Console Rmon Support Name Support Info Event Built-in Port Counters Stackable ArchitectureBack-to-Back Internal Stacker Optional Redundant Power Supply on SmartStack STS16-20R Safety with Electricity Preparing for InstallationSafety Recommendations Preventing Electrostatic Discharge Damage Chassis Accessibility PowerSite Requirements Environment Preparing for Installation Configuration Guidelines Frame Length Limit Ieee 802.1D Spanning Tree Ring Numbers Sample Uses of the SmartStack STS16-20RM Family Switches Typical Network without the SmartStack STS16-20D/STS16-20R Delivering Dedicated Bandwidth to Individual Workstations Deployment Scenarios Scenario using a Stacker Link and a Matrix Switch Setting Up CrossLinks Preparing for Installation Installation Installation Summary Package Contents Materials needed for Installation Mounting the Chassis Rack or Cabinet Mounting Mounting the Switch in a Rack or Cabinet Table-Mounting Connecting Devices to the Token Ring Ports Cabling Connecting Devices to Token Ring Ports Checking the Installation Connecting using Building Wiring Applying Power Back panel of the STS16-20D Back panel of the STS16-20R Stacker Link Module SmartStack STS-LM Front Panel SmartStack STS-LM Connectors and LEDs Connecting the Stacker Link CableConnector Description State Description Working with a Stack Inter-box Parameters Menu Parameter Checking the InstallationSend Authentication Traps, changing the Trap table in any Accessing Switch Management Switches can be configured in two waysUsing the switch console Using Snmp based graphical management applications Connecting to the Management Port Using a Modem Connecting the ConsoleConnecting a Terminal Directly to the Management Port Specification Value XON/XOFF Communication Problems Diagnostic Screen StkPort Accessing Switch Management Switch Configuration These users have full access to all configuration parameters General Guidelines Password Navigating within the Menus Main Menu Configuration Menu Switch Configuration Screen Dram InstalledSystem Description Build Description Burned-in MAC Address Flash Memory InstalledConfigured MAC Address System Location Address FormatSystem Name Stack Configuration Screen System ContactTime of Day Number of Boxes Module Information Screen Status ModelBoard ID HW Rev Vlan Configuration SmartStack STS16-20D/STS16-20R with four VLANs Vlan Configuration Menu Vlan Configuration Screen Configuration → Vlan ConfigurationBrdg/Rng Return Vlan Parameter Configuration for CRF Screen ViewAdd Change Bridging Mode Vlan NameParent Vlan State Vlan Parameter Configuration for BRF Screen LAA Vlan MAC Address Bridge Number802.1Q Vlan ID Vlan Port Configuration Configuration → Vlan Port ConfigurationPort Type IP Configuration Screen Default GatewayInterface MAC Address IP Address IP State Send Ping BootP Requests and Parameters Snmp Configuration Menu Spanning Tree Protocol Ieee 802.1D Spanning Tree Protocol STP Spanning Tree for BRF Screen STP Participation 100 Ieee STP Uses Bridge Functional AddressBridge Priority Bridge Hello Time in Seconds Bridge Forward Delay in Seconds Spanning Tree for CRF Screen101 CRF & Port Spanning Tree Parameters 102 STP Mode BRF-to-CRF Switch PrioritySTP Priority STP Cost 103 Switch Hello Time in Seconds Switch Maximum Message Age in SecondsSwitch Forward Delay in Seconds Port Spanning Tree Parameters Port Spanning Tree Parameters Screen 104Number of the port Priority STP Mode Current Spanning Tree Information Screen105 Path Cost To view more ports in the table Name Port Configuration Screen106 107 Enabled Media TypeCfg Loss Threshold Cfg Loss Sampling Interval Forwarding Mode Error High ThresholdError Low Threshold Error Sampling Interval Duplex Mode Operation Mode109 Media Speed Max Explorer Rate on Input 110 Switched Port Analyzer Menu from the Configuration MenuCrossLink 111 CrossLink Menu 112 CrossLink Configuration Screen Deletes all CrossLinks Setting up a CrossLink114 Clear Table Current CrossLink Information Screen 115Whether the specified CrossLink is active or not What ports are in that CrossLink Address Filtering 116 Configure Filters Configure Port Security ModeFilters and Port Security Menu 117 Configure Filters Screen 118 Protocol FiltersIndex MAC Address Exit Ports 119Applied Ports 120 Configure Port Security Mode ScreenSecurity. Then select Configure Port Security Mode View Port Filters Screen 121Numerical order of entries Description Port number Security Mode Protocol Filters Menu122 Security. Then select Protocol Filters Protocol Class Assignment Screen 123 Protocol Class AssignmentPort Filtering Attributes Class Port Filtering Attributes Screen 124DSAPs Block None Allow all frames in this protocol class default value 125 Address Aging 126Set at the Port Address Table Aging menu Set at the Master Address Table Aging menu Address Aging Menu Port Address Table Aging Screen127 Then select Port Address Table Aging 128 Port Port to which you want to assign an aging timeAging Time min Demand Aging Level Aging Time Master Address Table Aging Screen129 Password Menu Password is saved across warm boots and power cycles 131 Console Configuration Menu Console/Telnet Sessions Serial Link Configuration Screen Creating a Console Session Using a Modem Setting ValueStopping the Console Session 134 Telnet Configuration Screen Telnet Sessions Screen 136Box Remote Starting the Telnet Session Stopping the Telnet SessionInvoluntary Termination of the Telnet Session 137 138 Syslog Daemon Screen 139Displays more information Deletes an entry Zoom 140 Change EntryModifies an existing entry Restrictions Dsrr Configuration141 142 Primary and Traced Dsrr Port Dsrr Group Configuration Screen 143Box, Port Group Dsrr Configuration Screen 144 StateView and Change Group Status Backup for Primary Port Backup for Traced PortGroup Priority Hello Time 146 ATM Address Bootstrap BootDownload/Upload Menu 147 Serial Link Download Screen 148 149 Select Serial Link Download Select Main Image Download Tftp Download/Upload Screen 150Download/Upload Tftp Server Address 151 Execute name Download/Upload Reset Screen Number of Resets Since DiagnosticsReset Switch With Diagnostics Reset Switch Without Diagnostics Clear Nonvolatile RAM 153 Reset Port Address TablePower-On Diagnostics 154 Monitoring the Network from the Console Statistics Menu 155 Statistics Menu 156 Switch Statistics Screen 158 Error Frames Received Frames LostPending Send Requests Currently Active Stations Power Supply Information Screen 159 Port Status Screen 160Ins Spd 161 Oper Mode Fwd Mode Port Statistics Menu 162 General Statistics Screen 164 MAC Frames Forwarded Frames ProcessedFrames Unknown Broadcast Frames Received Frame Errors 165 Address Chain OverflowsAddress Table Overflows Receive Buffer Overflows Config Loss Config Loss ReasonLast Reset 166 Ring Number Mismatch Line Errors Burst ErrorsAC Errors Statistics Screen Abort Transmit Errors Internal ErrorsLost Frame Errors Frame Copied Errors Recoveries Lobe WiresFrequency Errors 169 Transmit Beacons State Information Screen 170Ring Status Ring State Uptime When Beacon 171Ring Speed Next Open Upstream Neighbor DTR MAC Information Menu 172TXI Information Station-CPort Information Error Report Timer TXI Information Screen173 Authorized Function Classes 174 Join StateMonitor State Beacon Source Address Station-CPort Information Screen Common Access Protocol Mask 176CPort Phantom Drive Mask Common Policy Flags Address Tables Menu 177 Master Address Table Screen 178Master Address Table Address 179 Master Route Descriptor Table Screen 180Search Master Route Descriptor Table 181 Route hex Unknown Select Vlan Address Table Vlan Address Table Screen182 Select Vlan Route Descriptor Table Vlan Route Descriptor Table Screen183 First Vlan to which the MAC address is known Locate MAC Address Screen184 Current Spanning Tree Information Screen 185Bridge ID Root ID Forward Delay 186 Hello TimeMax Message Age PId Dsg SwId/BrId Designated Switch Id/Bridge Id 187DCst Designated Cost Dsg PId Designated Port Id Root Port Current Spanning Tree Information for a CRF Screen188 189 Hello Time PId Port ID 190 Dsg SwId/BrId Designated Bridge ID Dsg PId Designated Port Identifier Vlan Statistics Vlan Statistics Screen for CRF191 Parent BRF Vlan Statistics for BRF Screen 192 PortsList of ports that belong to this CRF Vlan Statistics Screen for BRF appears 193 Dsrr Status ScreensDsrr Status Tables Screen Dsrr Neighbor Table Screen 194Neighbor Last Seen Displays the next entry sorted by MAC Address Dsrr Acting as Backup Table Screen Time Acting as Backup195 Closes the screen and returns to the Dsrr Status menu Diagnostic Test Results Screen 196 Message Content Message Log Information Screen197 Log Clear 198 BackStart/End 199 Pressing ESC, you cancel and return to previous menuDisplay Summary Screen 200 Snmp Setup Following sections describe the Snmp setup menusMonitoring the Network with Snmp 201 Snmp Configuration Snmp Configuration ScreenSend Authentication Traps Enable Rmon Statistics Configuration → Community Strings Community Strings Screen203 Snmp over MAC Community Strings Mode 204Community Name 205 Configuration → Trap ReceiversTrap Receivers Screen General traps List of Supported Traps from a STS16-20D/STS16-20R206 Add Entry Per Port Traps 207Enterprise specific traps from STS16.MIB Traps for CrossLinks 208Traps for the Spanning Tree Protocol 209 210 Monitoring Port Traffic 211Active Monitoring Passive Monitoring 212 Switched Port Analyzer Screen 213Analyzer Port Number Monitored Port Number 214 Troubleshooting Obtaining ServiceTroubleshooting in a Network Start of Troubleshooting Process Choosing a Troubleshooting Procedure Symptom and LED State Go ToProcedure a Procedure B 217 Procedure CProcedure D 218 219 220 Getting in Touch with Technical Support 221 Problem Report Form Switch InformationSwitch Configuration 222 Problem Description Network Installation Sketch 223 224 Appendix A. Abbreviations 225 226 Mbps TrCRF 227TrBRF 228 Connecting to the Out-of-Band Management Port Cable Function Cable Type or Cable SolutionAppendix B. Cable and Pin Information Out-of-Band Management Port and Cable Pin-Outs Pin Signal Name 230 Management Port Pin-OutShell TIA/EIA-232 Modem Cable Connections TIA/EIA-232 Null-Modem Cable for 25-pin Connector 231 Ohm IBM STP Data Connector-to-RJ-45 Straight-Through Cable Twisted-Pair Cable Pin Outs232 Straight-Through 100-Ohm/120-Ohm Cable Cabling Recommendations 233Cable Type Impedance Number Of Attaching Devices If using any 4 Mbps only adapters or filters 234Ring Types Speed Ring Speed Ohm Type Ohm Category Mbps 350 m 1148 ft 200 m 656 ft Not Supported 90 m 295 ft 235Ring Speed 100 or 120 Ohm Category 236 Index-1 IndexNumerics Index-2 194 Index-3 Index-4 191 Index-5 Index-6 Page 710001812