3Com 510, 520, 530 manual Network Topology, Broadcast Storms, Optimum Use of Resource

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A-6 BRIDGING AND ROUTING

Network Topology

If your network topology is star shaped, a combination of ISDN and bridging is usually the most efficient and successful option. Routing is a better solution if your network topology is a complex mix of both leased line and ISDN circuits, running at 64 Kbps to 2 Mbps.

Broadcast Storms

Bridges are programmed to automatically forward data packets by default while routers filter data packets by default. These attributes have an impact on the overall flow of data across the network. Much has been made of broadcast storms in connection with bridged networks, where the broadcast signals from bridges propagate to fill all of the wide area bandwidth, and bring the network down. Broadcast storms cannot be attributed to installation of bridges or routers, but by poor protocol implementation and network design. However the deployment of routers can effectively firewall one logical network from another.

Optimum Use of Resource

Bridged networks use Spanning Tree Protocol (STP) to provide network resilience, by retaining redundant links on stand-by, in case the primary link fails. This means that you are not making maximum use of available resources.

Routing protocols make each node aware of the primary and alternate routes available, ensuring that resources (particularly WAN links) are not wasted.

Routers have been designed to provide the optimum route through the network from the workstation through to the destination resource with which the user wishes to communicate. In a very large network there could be multiple paths available, and these could change as dedicated links go in or out of service. These changes in network topology are handled by routing protocols. However, when using the ISDN the source network can dial direct to the destination network, and establish a point-to-point bridged or routed connection. Generally, when using this type of ISDN dial-up link, routing does not provide much extra benefit.

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Contents Officeconnecttm Remote User Guide3Com Corporation 5400 Bayfront Plaza Santa Clara, California Important Safety Information Disconnect the power adapter before moving the unitWichtige Sicherheitshinweise WAN = Selv’INFORMATION DE Sécurité Importante Page Contents Specifications B-1 Management Connector Interface B-1Dimensions B-4 WAN Port Connecting Cable V.11/X.21Index Page How to Use This Guide This table shows where to find specific informationAbout this Guide IntroductionConventions Icon conventions that are used throughout this guide areText conventions used in this guide are Additional Safety Information Additional Safety InformationAbout this Guide OfficeConnect Remote Features Getting StartedGetting Started Easy to install, configure and support Benefits of IsdnPack Contents Checklist Pre-installation Requirements Registering Ownership Of Your OfficeConnect RemoteOfficeConnect Remote Front and Rear Panel Features Front PanelQuick flash Self test or software loading during power up Getting Started Rear Panel WAN OfficeConnect Remote 520 and 530 only Introduction Installation Using the Rubber Feet and Stacking ClipsSiting the OfficeConnect Remote To prolong the operational life of your equipmentWall Mounting the OfficeConnect Remote Clipping Your Units TogetherConnecting the Power Adapter Connecting to Your 10BaseT LANConnecting to a Single Workstation To connect the OfficeConnect Remote to in-house LANConnecting to Your 10Base2 LAN Counter-clockwise to unlock it and remove itConnecting to Isdn Connecting to the WANConnecting to the Voice Port Connecting a Management Terminal Location of OfficeConnect Fax and Print ServersQuick Configuration Starting Quick ConfigurationAt the command prompt enter QC Main Menu ScreenAbout Quick Configuration Setting the Unit Name Connecting to a Novell IPX Network Complete the fields on this screen as followsPress CTRL+E to submit this information Connecting to an IP Host on the Same IP Network 12 Connecting To An IP Host On The Same NetworkConnecting to an IP Host on a Different IP Network 13 Connecting to an IP Host on a Different NetworkPress CTRL+E to submit this information Connecting to the Internet or a PPP Router 14 Connecting To The Internet Or PPP RouterGetting Started Password is case-sensitive Press CTRL+E to save this informationSetting Up a WAN Link Monitoring Isdn Line UsageSetting Up a WAN Link Examples of Typical Isdn Networking Applications Novell NetworkDisconnected. In this way Isdn calls are kept to a minimum Examples of Typical Isdn Networking ApplicationsIP Host on the Same IP Network 192.000.000.xxxIP Host on Another IP Network Internet or PPP Router 18 IP routed network19 PPP Connections to the Internet and Corporate Network Multiple Connections from a Single Site 20 Multiple Connections from a Single SiteTroubleshooting TroubleshootingSoftware Reference guide for more Bridging and Routing Bridging and Routing ConceptsGuidelines For Choosing Bridging or Routing How Bridges LearnBridging Between Remote Sites Bridging and Routing ConceptsBuilding a Larger Network Multiple Paths Between Bridged LANs Figure A-2 Multiple Remote BridgesNetwork Topology Broadcast StormsOptimum Use of Resource Routing IP and IPX Network Organization, Structure and Physical LayoutInternet Figure A-4 Open Systems Interconnection Network Layer Model IP Routing Bridging and Routing IPX Routing Routing IP and IPX A-11IP Addresses Class CSubnet Masking Mask, for exampleUSA InterNIC, Network Solutions Huntmar park DriveHerndon KruislaanNumbered and Unnumbered Links Bridging and Routing Specifications Technical InformationBridge Characteristics ApprovalsPerformance FCC Requirement Dimensions Interface Cable Characteristics WAN Port Connecting Cable V.11/X.21 SupportWAN Port Connecting Cable V.24/V.28 Support WAN Port Connecting Cable V.35/V.36 Support Manager Port Connecting Cable LAN Port Connecting Cable 10BaseT Modem CableOrdering Information 100BaseVG An Ieee standard for using the new Ieee GlossaryChapter C Glossary Page Chapter C Glossary Page Chapter C Glossary Page Topology The way that a network is physically laid out On-line Technical Services 3Com Bulletin Board ServiceTechnical Support Support from Your Network Supplier Support from 3ComWorld Wide Web Site Returning Products for Repair To obtain an RMA number, call or faxTechnical Support Index NumericsLAN Limited Warranty EMC Update OfficeConnect Remote