Low Latency | Cabletron Systems STS16-20R, STS16-20D specs

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The increase in throughput is directly proportional to the number of physical token- rings that are interconnected through the switch. A SmartStack STS16-20D/ STS16-20R with 20 ports interconnected provides up to ten concurrent paths. With ten simultaneous conversations, the SmartStack STS16-20D/STS16-20R creates 160 Mbps throughput in half-duplex mode, or 320 Mbps throughput in full-duplex mode.

A single segment can be dedicated to a single host or shared by several. To optimize throughput, high-speed servers can be given dedicated SmartStack STS16-20D/ STS16-20R ports.

By transporting multiple Token Ring packets simultaneously, it boosts overall network throughput.

Low Latency

When operating in cut-through mode, the SmartStack STS16-20D/STS16-20R minimizes latency—the time it takes to forward a packet from one Token Ring segment to another—by beginning switching immediately after looking at the first six bytes of the destination address in the packet. If the packet needs to be switched to another LAN segment, its data begins flowing through the destination port before the entire packet has been received. The result: packets can appear at the output port 35 microseconds after entering the input port. Network devices that use store-and- forward technology introduce much longer delays because they wait to receive the entire packet before forwarding it.

By minimizing delay, the SmartStack STS16-20D/STS16-20R can move more packets freely throughout the LAN without degrading performance.

Switch Overview

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

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Cabletron Systems STS16-20R, STS16-20D manual Low Latency

Contents

Page Page Order Number 9032956-01 OC-7054 v .1 FCC Notice Vcci NoticeIndustry Canada Notice Declaration of Conformity Addendum IiiApplication of Council Directives 89/336/EEC 73/23/EEC Table of Contents Installation Preparing for Installation Switch Configuration Accessing Switch Management Monitoring the Network from the Console Statistics Menu 155Vii Monitoring the Network with Snmp 201 Troubleshooting 215Monitoring Port Traffic 211 Viii Getting in Touch with Technical Support 221 List of Figures List of Tables Xii Introduction SmartStack STS16-20D Token Ring Switch Switch of Switches Switching Technology Switch of Servers Switch of HubsSwitch of Desktops Switch of Routers Switch of Floors and Buildings Front Panel Details Management PortToken Ring Ports Reset Button Switched Port AnalyzerSystem Request Button Labels Status and Activity LEDsState Meaning Connection has been established to the stack Lists the stack-link LEDs and their meaningsLists the port LEDs and their meanings Token Ring port is inserted into the ring Lists the back panel connectors on the switch Back panel of the switches are illustratedBack Panel Details Name Description Features and Specifications FeaturesPerformance and Advanced Features Scalability and High Availability Management Installation Capacity Specifications Performance Performance Specifications Physical Characteristics Spanning Tree Protocol Specification Value Protocol compatibilitySupport On SmartStack STS16-20D only for Ports 17 to MIBs supported Switch Overview Multiple Simultaneous Conversations Low Latency SmartStack STS16-20D Token Ring Switch SmartStack STS16-20R Token Ring SwitchAddress Management Multiple Bridging Modes Source Route Bridging SRB Source Route Switching SRS SRT/SRB Source Route Transparent SRT Congestion Control Filtering Cut-Through Three Switching ModesStore and Forward Auto Adaptive Cut-Through Token Ring Port Operation Modes RI/RO-Like Connection on SmartStack STS16-20R ClearSession Support Transmission Priority Queues CrossLink Connections Spanning Tree Protocol Support Vlan Vlan Support Example of Dynamic Source Route Recovery, Base Configuration Dynamic Source Route Recovery Example of Dynamic Source Route Recovery, Normal State Example of Dynamic Source Route Recovery, Switch 1 Failed Management Specification SmartStack Manager for Windows Telnet Management and VT100 Management ConsoleIBM LAN Network Manager Rmon Support Name Support Info Event Stackable Architecture Built-in Port CountersBack-to-Back Internal Stacker Optional Redundant Power Supply on SmartStack STS16-20R Preparing for Installation Safety RecommendationsSafety with Electricity Preventing Electrostatic Discharge Damage Power Chassis AccessibilitySite Requirements Environment Preparing for Installation Frame Length Limit Configuration Guidelines 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 Summary Installation Package Contents Materials needed for Installation Rack or Cabinet Mounting Mounting the Chassis Table-Mounting Mounting the Switch in a Rack or Cabinet Cabling Connecting Devices to the Token Ring Ports Connecting Devices to Token Ring Ports Connecting using Building Wiring Checking the Installation Back panel of the STS16-20D Applying Power Back panel of the STS16-20R SmartStack STS-LM Front Panel Stacker Link Module Connecting the Stacker Link Cable SmartStack STS-LM Connectors and LEDsConnector Description State Description Inter-box Parameters Working with a Stack Checking the Installation Send Authentication Traps, changing the Trap table in anyMenu Parameter Switches can be configured in two ways Accessing Switch ManagementUsing the switch console Using Snmp based graphical management applications Connecting the Console Connecting a Terminal Directly to the Management PortConnecting to the Management Port Using a Modem XON/XOFF Specification Value Communication Problems StkPort Diagnostic Screen Accessing Switch Management Switch Configuration General Guidelines These users have full access to all configuration parameters Navigating within the Menus Password Main Menu Configuration Menu Dram Installed Switch Configuration ScreenSystem Description Build Description Flash Memory Installed Configured MAC AddressBurned-in MAC Address Address Format System NameSystem Location System Contact Stack Configuration ScreenTime of Day Number of Boxes Module Information Screen Model StatusBoard ID HW Rev SmartStack STS16-20D/STS16-20R with four VLANs Vlan Configuration Vlan Configuration Menu Configuration → Vlan Configuration Vlan Configuration ScreenBrdg/Rng Return View Vlan Parameter Configuration for CRF ScreenAdd Change Vlan Name Bridging ModeParent Vlan State Vlan Parameter Configuration for BRF Screen Bridge Number 802.1Q Vlan IDLAA Vlan MAC Address Configuration → Vlan Port Configuration Vlan Port ConfigurationPort Type Default Gateway IP Configuration ScreenInterface MAC Address IP Address Send Ping IP State BootP Requests and Parameters Spanning Tree Protocol Snmp Configuration Menu Ieee 802.1D Spanning Tree Protocol STP STP Participation Spanning Tree for BRF Screen Ieee STP Uses Bridge Functional Address 100Bridge Priority Bridge Hello Time in Seconds Spanning Tree for CRF Screen Bridge Forward Delay in Seconds101 CRF & Port Spanning Tree Parameters Switch Priority 102 STP Mode BRF-to-CRFSTP Priority STP Cost Switch Maximum Message Age in Seconds 103 Switch Hello Time in SecondsSwitch Forward Delay in Seconds Port Spanning Tree Parameters 104 Port Spanning Tree Parameters ScreenNumber of the port Priority Current Spanning Tree Information Screen STP Mode105 Path Cost To view more ports in the table Port Configuration Screen 106Name Media Type 107 EnabledCfg Loss Threshold Cfg Loss Sampling Interval Error High Threshold Forwarding ModeError Low Threshold Error Sampling Interval Operation Mode Duplex Mode109 Media Speed Max Explorer Rate on Input Switched Port Analyzer Menu from the Configuration Menu CrossLink110 111 112 CrossLink Menu CrossLink Configuration Screen Setting up a CrossLink 114 Clear TableDeletes all CrossLinks 115 Current CrossLink Information ScreenWhether the specified CrossLink is active or not What ports are in that CrossLink 116 Address Filtering Configure Port Security Mode Configure FiltersFilters and Port Security Menu 117 118 Protocol Filters Configure Filters ScreenIndex MAC Address 119 Applied PortsExit Ports Configure Port Security Mode Screen Security. Then select Configure Port Security Mode120 121 View Port Filters ScreenNumerical order of entries Description Protocol Filters Menu Port number Security Mode122 Security. Then select Protocol Filters 123 Protocol Class Assignment Protocol Class Assignment ScreenPort Filtering Attributes Class 124 Port Filtering Attributes ScreenDSAPs Block 125 None Allow all frames in this protocol class default value 126 Address AgingSet at the Port Address Table Aging menu Set at the Master Address Table Aging menu Port Address Table Aging Screen Address Aging Menu127 Then select Port Address Table Aging Port to which you want to assign an aging time 128 PortAging Time min Demand Aging Level Master Address Table Aging Screen 129Aging Time Password Menu 131 Password is saved across warm boots and power cycles Console/Telnet Sessions Console Configuration Menu Serial Link Configuration Screen Setting Value Creating a Console Session Using a ModemStopping the Console Session 134 Telnet Configuration Screen 136 Telnet Sessions ScreenBox Remote Stopping the Telnet Session Starting the Telnet SessionInvoluntary Termination of the Telnet Session 137 138 139 Syslog Daemon ScreenDisplays more information Deletes an entry 140 Change Entry Modifies an existing entryZoom Dsrr Configuration 141Restrictions Primary and Traced Dsrr Port 142 143 Dsrr Group Configuration ScreenBox, Port Group 144 State Dsrr Configuration ScreenView and Change Group Status Backup for Traced Port Backup for Primary PortGroup Priority Hello Time 146 ATM Address Boot BootstrapDownload/Upload Menu 147 148 Serial Link Download Screen Select Serial Link Download Select Main Image Download 149 150 Tftp Download/Upload ScreenDownload/Upload Tftp Server Address Execute name Download/Upload 151 Number of Resets Since Diagnostics Reset ScreenReset Switch With Diagnostics Reset Switch Without Diagnostics 153 Reset Port Address Table Power-On DiagnosticsClear Nonvolatile RAM 154 155 Monitoring the Network from the Console Statistics Menu 156 Statistics Menu Switch Statistics Screen Frames Lost 158 Error Frames ReceivedPending Send Requests Currently Active Stations 159 Power Supply Information Screen 160 Port Status ScreenIns Spd Fwd Mode 161 Oper Mode 162 Port Statistics Menu General Statistics Screen Frames Processed 164 MAC Frames ForwardedFrames Unknown Broadcast Frames Received 165 Address Chain Overflows Frame ErrorsAddress Table Overflows Receive Buffer Overflows Config Loss Reason Config LossLast Reset 166 Ring Number Mismatch Burst Errors Line ErrorsAC Errors Statistics Screen Internal Errors Abort Transmit ErrorsLost Frame Errors Frame Copied Errors Lobe Wires RecoveriesFrequency Errors 169 Transmit Beacons 170 State Information ScreenRing Status Ring State 171 Uptime When BeaconRing Speed Next Open Upstream Neighbor 172 DTR MAC Information MenuTXI Information Station-CPort Information TXI Information Screen Error Report Timer173 Authorized Function Classes Join State 174Monitor State Beacon Source Address Station-CPort Information Screen 176 Common Access Protocol MaskCPort Phantom Drive Mask Common Policy Flags 177 Address Tables Menu 178 Master Address Table ScreenMaster Address Table Address 179 180 Master Route Descriptor Table ScreenSearch Master Route Descriptor Table Unknown 181 Route hex Vlan Address Table Screen 182Select Vlan Address Table Vlan Route Descriptor Table Screen 183Select Vlan Route Descriptor Table Locate MAC Address Screen 184First Vlan to which the MAC address is known 185 Current Spanning Tree Information ScreenBridge ID Root ID 186 Hello Time Forward DelayMax Message Age PId 187 Dsg SwId/BrId Designated Switch Id/Bridge IdDCst Designated Cost Dsg PId Designated Port Id Current Spanning Tree Information for a CRF Screen 188Root Port PId Port ID 189 Hello Time Dsg PId Designated Port Identifier 190 Dsg SwId/BrId Designated Bridge ID Vlan Statistics Screen for CRF Vlan Statistics191 Parent BRF 192 Ports Vlan Statistics for BRF ScreenList of ports that belong to this CRF Vlan Statistics Screen for BRF appears Dsrr Status Screens Dsrr Status Tables Screen193 194 Dsrr Neighbor Table ScreenNeighbor Last Seen Displays the next entry sorted by MAC Address Time Acting as Backup Dsrr Acting as Backup Table Screen195 Closes the screen and returns to the Dsrr Status menu 196 Diagnostic Test Results Screen Message Log Information Screen Message Content197 Log 198 Back Start/EndClear Pressing ESC, you cancel and return to previous menu Display Summary Screen199 200 Following sections describe the Snmp setup menus Snmp SetupMonitoring the Network with Snmp 201 Snmp Configuration Screen Snmp ConfigurationSend Authentication Traps Enable Rmon Statistics Community Strings Screen Configuration → Community Strings203 Snmp over MAC Community Strings 204 Community NameMode Configuration → Trap Receivers Trap Receivers Screen205 List of Supported Traps from a STS16-20D/STS16-20R 206 Add EntryGeneral traps 207 Enterprise specific traps from STS16.MIBPer Port Traps 208 Traps for the Spanning Tree ProtocolTraps for CrossLinks 209 210 211 Monitoring Port TrafficActive Monitoring Passive Monitoring 212 213 Switched Port Analyzer ScreenAnalyzer Port Number Monitored Port Number 214 Obtaining Service TroubleshootingTroubleshooting in a Network Start of Troubleshooting Process Symptom and LED State Go To Choosing a Troubleshooting ProcedureProcedure a Procedure B Procedure C Procedure D217 218 219 220 221 Getting in Touch with Technical Support Switch Information Problem Report FormSwitch Configuration 222 223 Problem Description Network Installation Sketch 224 225 Appendix A. Abbreviations Mbps 226 227 TrBRFTrCRF 228 Cable Function Cable Type or Cable Solution Connecting to the Out-of-Band Management PortAppendix B. Cable and Pin Information Out-of-Band Management Port and Cable Pin-Outs 230 Management Port Pin-Out Pin Signal NameShell TIA/EIA-232 Modem Cable Connections 231 TIA/EIA-232 Null-Modem Cable for 25-pin Connector Twisted-Pair Cable Pin Outs Ohm IBM STP Data Connector-to-RJ-45 Straight-Through Cable232 Straight-Through 100-Ohm/120-Ohm Cable 233 Cabling RecommendationsCable Type Impedance Number Of Attaching Devices 234 If using any 4 Mbps only adapters or filtersRing Types Speed Ring Speed Ohm Type Ohm Category 235 Ring Speed 100 or 120 Ohm CategoryMbps 350 m 1148 ft 200 m 656 ft Not Supported 90 m 295 ft 236 Index NumericsIndex-1 194 Index-2 Index-3 191 Index-4 Index-5 Index-6 Page 710001812