Asante Technologies 1012 manual Configuring a Redundant Link, Checking the Link, 10BaseT

Page 48

Chapter 2 — Connecting to the Network

Configuring a

Redundant

Link

One of the most common reasons for a loss of network services is damage to, or failure of, cabling interconnections. By taking advantage of the “Auto-sense” (The AsantéBridge 1012 automati- cally senses the presence of physical links connected to the 3in1 Uplink port), redundant network backbone links may be easily configured for increased network reliability.

For example, thin Ethernet (BNC) wiring could be used as a backup to a twisted-pair (10BaseT) backbone.

Redundant links work because the AsantéBridge 1012, using Auto- sense, can determine what media types are available and there- fore, what connection it should use as the uplink.

Remember the priority sequence in which the hub searches for an uplink connection:

❏First priority is given to AUI

❏Second to 10BaseT, and

❏Third to BNC.

 

If, for example, your uplink is connected with BNC cabling and

 

you then add a 10BaseT cable to the uplink port, the result is that

 

Auto-sense will detect this and cause uplink traffic to switch from

 

the BNC to the 10BaseT media because the 10BaseT is considered

 

higher priority.

Checking the Link

For each media type the checking methodology is a bit different.

 

AUI:

 

According to the priority scheme described above,AUI is the first

 

medium to be checked for use as the primary uplink connection.

 

The AsantéBridge knows to use the AUI port if it senses that a

 

MAU exists.The presence of a MAU is detected by pins 2 (CI-A)

 

and 9 (CI-B) sensing the MAU's transformer.As long as a MAU con-

 

nection is detected, the 3in1 Uplink will use the AUI port. If no

 

MAU is detected, the hub will switch to the next available

 

medium in the priority sequence (10BaseT then BNC).

 

10BaseT:

 

According to the priority scheme described above, 10T will not

 

be the active uplink if an AUI connection exists. For the 10T con-

 

nection, a Link Integrity Test is performed to determine if a link is

 

available on this port.This test checks 1 of the 2 twisted pairs (RX

 

pair) that make up a 10T cable. If the test fails and BNC cabling

 

exists, then the uplink will be switched to the BNC medium.

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Contents AsantéBridge Users’ Guide Trademarks Tell Us What You Think Page Table of Contents Configuring a Redundant Link Setting Up Out-of-Band LinksConnecting a VT100 Terminal Default Settings AsantéBridge 1012 Local ManagementList of Figures Figure C-4 Crossover RJ-45 Cable page C-4 Introduction About This ManualIntroduction Intended Audience Conventions Used In This Manual Intended AudienceTell Us What You Think Technical SupportQuick Start Before You StartQuick Start Introducing AsantéBridge Introducing the AsantéBridgeBridging Between Two Segments AsantéBridge Features SnmpQuick View AsantéBridgeFront Panel Quick View RJ45 Port Connectors Bridge External Port Status LEDBridge Spanning Tree Status LEDs Bridge Hub Port Status LEDsRJ21 Port Connector AsantéBridge 1012 Rear Panel3in1 Port Through/End DIP Switch Bridge External Port AUIBridge External Port Link/Receive LED Bridge External Port Collision LEDPC/Terminal DIP Switch AC Power ConnectorOn/Off Switch FanInterpreting LEDs FlashingInstalling AsantéBridge 1012 Preparing for the InstallationInstalling the AsantéBridge Basic Installation Procedures ToolsUnpacking the AsantéBridge Positioning the AsantéBridge Asante´HubRack-mounting the AsantéBridge Page Connecting Two Segments to the AsantéBridge Dividing the Network into SegmentsShown below About Spanning TreesConnecting Devices to the AsantéBridge Using the front panel RJ45 portsWhat You Need Using the rear panel RJ21 connector Configuration OptionsQuick Start Connecting to the Network Connecting to the Network Before You StartAbout Bridging About BridgingSimple Transparent Bridge Bridging between segmentsAbout Bridging Spanning Tree Like thisRedundant bridging Using the 3in1 Port Connecting to the BNC PortUsing the 3in1 Port Interconnecting Hubs on Thin Ethernet BackboneConnecting to the AUI Port Interconnecting Using Foirl Fiber Optic Inter-Repeater LinkInterconnecting to Thick Ethernet Backbone Connecting to the RJ45 in and Out Ports Connecting an In-Band Daisychaining Configuring a Redundant Link Checking the Link10BaseT Configuring a Redundant Link An Example ConfigurationIf the Main Hub Goes Down If a Link Goes Down to the Main HubSetting Up Out-of-Band Links Setting Up Out-of-Band LinksInterconnecting Hubs 10 Connecting the Asanté Management Station for Out-of-Band Recommended Method Distance RestrictionsConfiguring Hub DIP Switches PC/Terminal SwitchThrough/End Switch Connecting a VT100 Terminal Connecting a VT100 TerminalDefault Settings Lists the factory default settingsAsantéBridge 1012 Local Management These functions, use the following flow chart AsantéBridge 1012 Local ManagementBridge Diagnostics Bridge DiagnosticsLocal Management Local Management Main MenuLocal Management Menu System General Help Menu Local Management Help WindowAccessing the Configuration Menu system Configuration Menu SystemConfiguration Menu System Reset System item is a command. Selecting this item System Information MenuPassword Menu Password MenuSnmp Agent Parameters Menu SystemBridge Snmp agent menu has the following four submenus TCP/IP Parameters Menu TCP/IP Parameters MenuSoftware Update Menu Software Update MenuAbout the Software Update function Configuration Menu System 10 System Update Status Window Menu without taking any actionConfiguration Menu System Snmp Trap Receiver Table 11 Snmp Trap Receiver TableSnmp Community Name Table 12 Snmp Community Name TableThis table allows you to control access to Snmp MIB objects Out-of-Band Parameters Menu 13 Out-of-Band Parameters MenuEnter control-z to return to the Configuration Menu Bridge Parameters Menu System 14 Bridge Parameters MenuSpanning Tree Bridge Parameters Menu 15 Spanning Tree Bridge Parameters MenuActivity.To update the window, enter control-r Spanning Tree Port Setting Menu 16 Spanning Tree Port Setting MenuBridge Forwarding Table About ForwardingExit returns you to the Bridge Parameters Menu Alphabetic portion of the field defines the type of entry About dynamic and static table entriesAsantéBridge 1012 Local Management Using the Edit Function 18 Editing the Forwarding TableUsing the Search Function 19 Searching for an AddressBridge Filtering Table About the Filtering Table20 Bridge Filtering Table Configuration Menu System Resetting the Bridge 21 Resetting the BridgeMenu Statistics Menu System 22 Bridge StatisticsSupport for Pre 10BaseT Devices Appendix a Support for Pre 10BaseT Devices Technical Specifications Appendix B Technical Specifications B-3 B-4 Pinouts and Cable Specifications Appendix C Pinouts and Cable Specifications RJ-45 to RJ-21 Pinouts Amphenol to Modular JackC-3 RJ-45 Modular Jack to Wall Jack Pinouts RJ-45 to RJ-45 Crossover CableAUI DB-15 Pinouts Table C-1 AUI PinoutsC-6 AsantéBridge 1012 Index LED Numerics Manual P/N
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