Multiple Bridging Modes | Cabletron Systems STS16-20R, STS16-20D

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Multiple Bridging Modes

The SmartStack STS16-20D/STS16-20R supports four different switching modes to provide maximum flexibility in all installation environments. The switching modes are source route switching (SRS), source route bridging (SRB), source route transparent (SRT) and SRT/SRB. The switch operates on two levels (BRF and CRF) as outlined in the following:

		BRF 1
CRF 1	CRF 2	CRF 3	CRF 4
			Switch

Figure 6. Typical Configuration with SmartStack STS16-20R

Switches Using Multiple Bridging Modes

The switch bridging modes are founded on the concept of logical rings (LR) or logical segments in Ethernet. The logical ring is represented on the switch by the DTR (IEEE 802.5r) standard’s concentrator relay function (CRF). A logical ring may consist of interconnected CRFs on different switches.

Each port on the switch belongs to a CRF, which is a logical grouping of ports within the switch. A CRF can consist of any number of ports within a switch or a switch stack. The ports within a CRF do not have to be adjacent.

The logical rings and subsequently, the CRFs, are assigned a unique ring number each when the switch performs source routing functions. The bridging is performed through the logical entity of the bridge relay function (BRF).

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 Multiple Bridging Modes

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 Installation Preparing for Installation Switch Configuration Accessing Switch Management Vii Monitoring the Network from the Console StatisticsMenu 155 Viii Troubleshooting 215Monitoring the Network with Snmp 201 Monitoring Port Traffic 211 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 Desktops Switch of ServersSwitch of Hubs Switch of Routers Switch of Floors and Buildings Token Ring Ports Front Panel DetailsManagement Port System Request Button Reset ButtonSwitched Port Analyzer State Meaning LabelsStatus and Activity LEDs Token Ring port is inserted into the ring Lists the stack-link LEDs and their meaningsConnection has been established to the stack Lists the port LEDs and their meanings Name Description Back panel of the switches are illustratedLists the back panel connectors on the switch Back Panel Details Performance and Advanced Features Features and SpecificationsFeatures Scalability and High Availability Management Installation Capacity Specifications Performance Performance Specifications Physical Characteristics STS16-20D only for Ports 17 to MIBs supported Specification Value Protocol compatibilitySpanning Tree Protocol Support On SmartStack 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 Bridging SRB Source Route Switching SRS SRT/SRB Source Route Transparent SRT Congestion Control Filtering Auto Adaptive Cut-Through Three Switching ModesCut-Through Store and Forward 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 IBM LAN Network Manager SmartStack Manager for WindowsTelnet Management and VT100 Management Console Rmon Support Name Support Info Event Internal Stacker Built-in Port CountersStackable Architecture Back-to-Back Optional Redundant Power Supply on SmartStack STS16-20R Safety with Electricity Preparing for InstallationSafety Recommendations Preventing Electrostatic Discharge Damage Environment Chassis AccessibilityPower Site Requirements 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 State Description SmartStack STS-LM Connectors and LEDsConnecting the Stacker Link Cable Connector Description Inter-box Parameters Working with a Stack Menu Parameter Checking the InstallationSend Authentication Traps, changing the Trap table in any Using Snmp based graphical management applications Accessing Switch ManagementSwitches can be configured in two ways Using the switch console Connecting to the Management Port Using a Modem Connecting the ConsoleConnecting a Terminal Directly to the Management Port 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 Build Description Switch Configuration ScreenDram Installed System Description Burned-in MAC Address Flash Memory InstalledConfigured MAC Address System Location Address FormatSystem Name Number of Boxes Stack Configuration ScreenSystem Contact Time of Day Module Information Screen HW Rev StatusModel Board ID SmartStack STS16-20D/STS16-20R with four VLANs Vlan Configuration Vlan Configuration Menu Return Vlan Configuration ScreenConfiguration → Vlan Configuration Brdg/Rng Change Vlan Parameter Configuration for CRF ScreenView Add State Bridging ModeVlan Name Parent Vlan Vlan Parameter Configuration for BRF Screen LAA Vlan MAC Address Bridge Number802.1Q Vlan ID Type Vlan Port ConfigurationConfiguration → Vlan Port Configuration Port IP Address IP Configuration ScreenDefault Gateway Interface MAC 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 Bridge Hello Time in Seconds 100Ieee STP Uses Bridge Functional Address Bridge Priority CRF & Port Spanning Tree Parameters Bridge Forward Delay in SecondsSpanning Tree for CRF Screen 101 STP Cost 102 STP Mode BRF-to-CRFSwitch Priority STP Priority Port Spanning Tree Parameters 103 Switch Hello Time in SecondsSwitch Maximum Message Age in Seconds Switch Forward Delay in Seconds Priority Port Spanning Tree Parameters Screen104 Number of the port To view more ports in the table STP ModeCurrent Spanning Tree Information Screen 105 Path Cost Name Port Configuration Screen106 Cfg Loss Sampling Interval 107 EnabledMedia Type Cfg Loss Threshold Error Sampling Interval Forwarding ModeError High Threshold Error Low Threshold Max Explorer Rate on Input Duplex ModeOperation Mode 109 Media Speed 110 Switched Port Analyzer Menu from the Configuration MenuCrossLink 111 112 CrossLink Menu CrossLink Configuration Screen Deletes all CrossLinks Setting up a CrossLink114 Clear Table What ports are in that CrossLink Current CrossLink Information Screen115 Whether the specified CrossLink is active or not 116 Address Filtering 117 Configure FiltersConfigure Port Security Mode Filters and Port Security Menu MAC Address Configure Filters Screen118 Protocol Filters Index Exit Ports 119Applied Ports 120 Configure Port Security Mode ScreenSecurity. Then select Configure Port Security Mode Description View Port Filters Screen121 Numerical order of entries Security. Then select Protocol Filters Port number Security ModeProtocol Filters Menu 122 Class Protocol Class Assignment Screen123 Protocol Class Assignment Port Filtering Attributes Block Port Filtering Attributes Screen124 DSAPs 125 None Allow all frames in this protocol class default value Set at the Master Address Table Aging menu Address Aging126 Set at the Port Address Table Aging menu Then select Port Address Table Aging Address Aging MenuPort Address Table Aging Screen 127 Demand Aging Level 128 PortPort to which you want to assign an aging time Aging Time min Aging Time Master Address Table Aging Screen129 Password Menu 131 Password is saved across warm boots and power cycles Console/Telnet Sessions Console Configuration Menu Serial Link Configuration Screen 134 Creating a Console Session Using a ModemSetting Value Stopping the Console Session Telnet Configuration Screen Remote Telnet Sessions Screen136 Box 137 Starting the Telnet SessionStopping the Telnet Session Involuntary Termination of the Telnet Session 138 Deletes an entry Syslog Daemon Screen139 Displays more information Zoom 140 Change EntryModifies an existing entry Restrictions Dsrr Configuration141 Primary and Traced Dsrr Port 142 Group Dsrr Group Configuration Screen143 Box, Port Group Status Dsrr Configuration Screen144 State View and Change Hello Time Backup for Primary PortBackup for Traced Port Group Priority 146 ATM Address 147 BootstrapBoot Download/Upload Menu 148 Serial Link Download Screen Select Serial Link Download Select Main Image Download 149 Tftp Server Address Tftp Download/Upload Screen150 Download/Upload Execute name Download/Upload 151 Reset Switch Without Diagnostics Reset ScreenNumber of Resets Since Diagnostics Reset Switch With Diagnostics Clear Nonvolatile RAM 153 Reset Port Address TablePower-On Diagnostics 154 155 Monitoring the Network from the Console Statistics Menu 156 Statistics Menu Switch Statistics Screen Currently Active Stations 158 Error Frames ReceivedFrames Lost Pending Send Requests 159 Power Supply Information Screen Spd Port Status Screen160 Ins Fwd Mode 161 Oper Mode 162 Port Statistics Menu General Statistics Screen Broadcast Frames Received 164 MAC Frames ForwardedFrames Processed Frames Unknown Receive Buffer Overflows Frame Errors165 Address Chain Overflows Address Table Overflows 166 Ring Number Mismatch Config LossConfig Loss Reason Last Reset Statistics Screen Line ErrorsBurst Errors AC Errors Frame Copied Errors Abort Transmit ErrorsInternal Errors Lost Frame Errors 169 Transmit Beacons RecoveriesLobe Wires Frequency Errors Ring State State Information Screen170 Ring Status Upstream Neighbor Uptime When Beacon171 Ring Speed Next Open Station-CPort Information DTR MAC Information Menu172 TXI Information Authorized Function Classes Error Report TimerTXI Information Screen 173 Beacon Source Address 174Join State Monitor State Station-CPort Information Screen Common Policy Flags Common Access Protocol Mask176 CPort Phantom Drive Mask 177 Address Tables Menu Address Master Address Table Screen178 Master Address Table 179 Master Route Descriptor Table Master Route Descriptor Table Screen180 Search Unknown 181 Route hex 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 Root ID Current Spanning Tree Information Screen185 Bridge ID PId Forward Delay186 Hello Time Max Message Age Dsg PId Designated Port Id Dsg SwId/BrId Designated Switch Id/Bridge Id187 DCst Designated Cost Root Port Current Spanning Tree Information for a CRF Screen188 PId Port ID 189 Hello Time Dsg PId Designated Port Identifier 190 Dsg SwId/BrId Designated Bridge ID Parent BRF Vlan StatisticsVlan Statistics Screen for CRF 191 Vlan Statistics Screen for BRF appears Vlan Statistics for BRF Screen192 Ports List of ports that belong to this CRF 193 Dsrr Status ScreensDsrr Status Tables Screen Displays the next entry sorted by MAC Address Dsrr Neighbor Table Screen194 Neighbor Last Seen Closes the screen and returns to the Dsrr Status menu Dsrr Acting as Backup Table ScreenTime Acting as Backup 195 196 Diagnostic Test Results Screen Log Message ContentMessage Log Information Screen 197 Clear 198 BackStart/End 199 Pressing ESC, you cancel and return to previous menuDisplay Summary Screen 200 201 Snmp SetupFollowing sections describe the Snmp setup menus Monitoring the Network with Snmp Enable Rmon Statistics Snmp ConfigurationSnmp Configuration Screen Send Authentication Traps Community Strings Configuration → Community StringsCommunity Strings Screen 203 Snmp over MAC 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 Passive Monitoring Monitoring Port Traffic211 Active Monitoring 212 Monitored Port Number Switched Port Analyzer Screen213 Analyzer Port Number 214 Start of Troubleshooting Process TroubleshootingObtaining Service Troubleshooting in a Network Procedure B Choosing a Troubleshooting ProcedureSymptom and LED State Go To Procedure a 217 Procedure CProcedure D 218 219 220 221 Getting in Touch with Technical Support 222 Problem Report FormSwitch Information Switch Configuration 223 Problem Description Network Installation Sketch 224 225 Appendix A. Abbreviations Mbps 226 TrCRF 227TrBRF 228 Out-of-Band Management Port and Cable Pin-Outs Connecting to the Out-of-Band Management PortCable Function Cable Type or Cable Solution Appendix B. Cable and Pin Information TIA/EIA-232 Modem Cable Connections Pin Signal Name230 Management Port Pin-Out Shell 231 TIA/EIA-232 Null-Modem Cable for 25-pin Connector Straight-Through 100-Ohm/120-Ohm Cable Ohm IBM STP Data Connector-to-RJ-45 Straight-Through CableTwisted-Pair Cable Pin Outs 232 Number Of Attaching Devices Cabling Recommendations233 Cable Type Impedance Ring Speed Ohm Type Ohm Category If using any 4 Mbps only adapters or filters234 Ring Types Speed 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 194 Index-2 Index-3 191 Index-4 Index-5 Index-6 Page 710001812