Cabletron Systems bridges Networking Manual Download Page 1

Page: 1 / 132

Cabletron Systems

Networking Guide

Workgroup Solutions

Summary of Contents for bridges

Page 1: ...Cabletron Systems Networking Guide Workgroup Solutions...

Page 2: ......

Page 3: ...ystems Inc All rights reserved Printed in the United States of America Order Number 9032094 January 1997 Cabletron Systems Inc P O Box 5005 Rochester NH 03866 5005 Cabletron Systems SPECTRUM BRIM FNB...

Page 4: ...Notice ii...

Page 5: ...Ethernet 2 3 Token Ring 2 5 Chapter 3 The Workgroup Approach Standalones 3 1 Standalones the Original Networking Devices 3 2 Management of Standalones 3 3 Limitations of Standalones 3 3 Stackables 3...

Page 6: ...es 5 17 Choosing Backbone Technologies 5 21 Chapter 6 Ethernet Ethernet Workgroup Devices 6 2 Shared Devices 6 2 Switched Devices 6 4 Ethernet Workgroup Design 6 5 The Home Office 6 5 The Small Office...

Page 7: ...ndix A Charts and Tables Workgroup Design Tables A 1 Ethernet A 1 Fast Ethernet A 3 Token Ring A 4 PIMs and BRIMs A 5 Networking Standards and Limitations A 8 Ethernet A 8 Fast Ethernet A 9 Token Ring...

Page 8: ...Contents vi...

Page 9: ...and FDDI If you are unfamiliar with these technologies Cabletron Systems produces instructional and reference materials that may be of assistance in learning these networking technologies The availabl...

Page 10: ...bletron Systems various speciality interface modules Chapter 5 Network Design covers the information and decisions involved in the identification of networking needs and formation of solutions which m...

Page 11: ...n of hardware and cabling Cabletron Systems maintains a staff of network design personnel and highly trained cabling and hardware installation technicians The services of the Networking Services group...

Page 12: ...in greater or lesser detail than they are presented here Cabletron Systems Networking Guide MMAC FNB Solutions Cabletron Systems Cabling Guide Cabletron Systems Ethernet Technology Guide Cabletron Sy...

Page 13: ...rnet and Token Ring This section is intended to be a review of the most important aspects of these technologies and is not expected to stand alone For more detailed information Cabletron Systems publi...

Page 14: ...ns listen for network traffic hear none then transmit simultaneously In this case both transmissions are damaged and the stations sensing this collision must retransmit at some later time Backoff algo...

Page 15: ...t of the popular Ethernet technology described above Fast Ethernet uses the same CSMA CD media access method and basic network operation The main differences between Ethernet and Fast Ethernet are the...

Page 16: ...and network restrictions in order to adhere to IEEE standards Cabling Quality All 100BASE TX links require UTP cabling meeting or exceeding the Telecommunications Industry Association TIA Category 5 s...

Page 17: ...dges switches or routers can allow the creation of larger networks Token Ring Token Ring network operation is based on the principle that the operation of the entire network determines when a station...

Page 18: ...network to suffer errors and poor performance In order to stretch the capabilities of a Token Ring network various technologies are available which extend the distance a signal can travel before suffe...

Page 19: ...ngs 16 Mbps Token Ring networks also impose limitations on the maximum length of any media connected to an active port as shown in the following list IBM Types 1 2 STP 150 m IBM Types 6 9 STP 100 m Ca...

Page 20: ...o 16 Mbps networks In one case the number of stations supported by these faster Token Ring networks is significantly lower than the number supported by the 4 Mbps rings IBM Types 1 2 STP 250 stations...

Page 21: ...mitations involved in the IEEE 802 5 standard and the various cable specifications that are more detailed and complex These limitations are covered in detail in the Cabletron Systems Cabling Guide and...

Page 22: ...Review of Networking 2 10 Token Ring...

Page 23: ...of these products can greatly aid a Network Designer in determining where and to what extent to implement standalone and stackable devices in a new or existing network Standalones A standalone device...

Page 24: ...rks grew in size the standalone devices began to offer greater control and expandability The design of multiport repeaters allowed one signal to be sent out several interfaces simultaneously and the s...

Page 25: ...lexity The modular chassis allowed facility networks to support far greater numbers of users from a single location than was possible with standalone devices Limitations of Standalones In time the net...

Page 26: ...number of standalone devices In effect the stack fools the network into thinking that the users connected to the stack are in a single repeater or concentrator By placing stackables together in a coll...

Page 27: ...nnect Cables The HubSTACK cables handle the communications between stackable devices including network traffic and management communications The use of these custom short cables allows the stack to ac...

Page 28: ...rvices for the rest of the devices in its stack over the same connection that is used for stackable to stackable communications The management traffic moves across the artificial backplane that is set...

Page 29: ...rt a wide variety of networking technologies The available BRIMs and their configuration options are detailed in Chapter 4 PIMs and BRIMs By incorporating the BRIM technology into a number of standalo...

Page 30: ...transceivers at each location While not extremely expensive these external transceivers can become maintenance and design hurdles when troubleshooting or expanding the network Modules for modular cha...

Page 31: ...tch platform such as the Cabletron Systems MMAC Plus It is important that workgroup devices be able to support complexity so Cabletron Systems has designed support for different media segmentation and...

Page 32: ...link Types of PIMs To provide connectivity options for the widest variety of networking needs and to increase the flexibility of Cabletron Systems networking devices there are several types of PIMs av...

Page 33: ...equipment The EPIMs that are available from Cabletron Systems and the types of cabling and connectors supported by each are listed below EPIM A AUI DB15 Female Connector EPIM C Coaxial Cable RG 58 Co...

Page 34: ...lded Twisted Pair DB9 Connector TPIM T2 Unshielded Twisted Pair RJ45 Connector TPIM T4 Shielded Twisted Pair RJ45 Connector FPIMs FPIM stands for FDDI Port Interface Module The FPIM is a single link f...

Page 35: ...ported by the available APIMs are listed below APIM 11 Multimode Fiber Optic TAXI connection APIM 21 Multimode Fiber Optic OC3c connection APIM 22 Single Mode Fiber Optic OC3c connection APIM 29 Unshi...

Page 36: ...T EPIM F3 Ethernet Single Mode Fiber Optics ST EPIM T Ethernet UTP RJ45 EPIM X Ethernet AUI DB15 Female Fast Ethernet Interface Module 100TX Fast Ethernet UTP RJ45 Fast Ethernet Interface Module 100FX...

Page 37: ...ber Optics SC APIM 11 ATM TAXI Multimode Fiber Optics SC APIM 21 ATM OC3c Multimode Fiber Optics SC APIM 22 ATM OC3c Single Mode Fiber Optics SC APIM 29 ATM STS3c UTP RJ45 APIM 67 ATM DS3 Thin Coaxial...

Page 38: ...lities are needed a BRIM can be added to any BRIM capable device This gradual upgrade path allows Network Designers to plan ahead for the incorporation of new technologies without having to pay for th...

Page 39: ...single BRIM F6 match for the sake of consistency and ease of cable and connector management BRIM A6 The BRIM A6 provides a single ATM uplink for the LAN device it is placed in The BRIM A6 supports a v...

Page 40: ...can be useful for the selection of a BRIM when designing a workgroup requiring a connection to a particular networking technology Table 4 2 BRIM Reference Table BRIM Technology Connector Type BRIM E6...

Page 41: ...figuration is the process of putting hardware together to create a functioning network NOTES When designing a network installation or configuration draw the network At the very least make a rough sket...

Page 42: ...y of enterprise networks are collections of workgroups that are connected to one another The various workgroups all have different needs and implementations and are tied together to form a cohesive an...

Page 43: ...n does not take function into account As the deciding criteria for this type of workgroup organization is location only geographical proximity is often the least efficient workgroup creation method in...

Page 44: ...ions Since most of the time business departments are involved with sharing information among other members of their department or a group of related departments Accounting Personnel and Payroll for ex...

Page 45: ...ization troubleshooting and fault recovery can be difficult in a network of this kind As the end users are not necessarily located in the same area faults which affect the workgroup must be looked for...

Page 46: ...ving etc and one workgroup which encompassed only the Documentation personnel of each department who although working in different departments all require access to the same functions through the netw...

Page 47: ...cs Unfortunately it combines some of the worst features of the other methods of arranging workgroups as the cost of this level of control An example of priority organization is the common practice of...

Page 48: ...network based on their relative importance the priority organization method makes little or no accommodation for the localization of network traffic which is the purpose of segmentation If a file ser...

Page 49: ...is the job of the Network Manager or persons designing the network to determine which factors of the network design are the foremost requirements The most common determining factors in selecting a net...

Page 50: ...and the network will be much easier to see as a whole The network plan in the design stages of networking can point out areas that need additional work help you locate possible trouble spots and allo...

Page 51: ...to remember when planning cabling installations is that attention to detail will pay off You may save a few hours at installation by not labeling your cables but those saved hours will be more than sp...

Page 52: ...ered by contingencies or their effects are minimized This aspect of network design is called fault aversion A fault averse network uses the capabilities of available hardware and the fault tolerance o...

Page 53: ...e point of failure but only from the point of view of the connection between segments as the segments themselves will continue to operate without the repeater The location and elimination of single po...

Page 54: ...fail often or be shut down on the dual ring where they will benefit from the automated recovery feature Network Maps and Record Keeping A large portion of the process of expanding an existing network...

Page 55: ...ron Systems Ethernet bridge NBR 220 If in the future this device is upgraded the map can remain the same but the device code table or chart can be changed If for example the NBR 220 was upgraded to an...

Page 56: ...makes up the workgroup in order to add special functions What actions will be taken if the facility expands or constructs another separate office All of these questions should be examined before selec...

Page 57: ...or hub to a small backbone network than to continue expanding workgroups that may be already quite congested In addition the backbone can provide a point from which a higher speed technology can be pa...

Page 58: ...ttached to a shared bus such as a thick coaxial cable Limited Expandability While it is possible to simply add stations to a thick Ethernet backbone the ring dependent technologies Token Ring and FDDI...

Page 59: ...ions provided by the collapsed backbone often outweighs the associated costs Connectivity Requirements The collapsed backbone implementation brings all cables of the backbone to a central point and th...

Page 60: ...e the connections between workgroups greatly increases the control that Network Managers have over the network and may improve performance by streamlining the communications between networks Figure 5...

Page 61: ...operation of each type of technology the strengths and shortcomings of those technologies and the special design considerations that each technology imposes on the network You may again wish to refer...

Page 62: ...Network Design 5 22 The Workgroup in the Larger Network...

Page 63: ...ducts Once the proposed network has been broken into a number of workgroups it is necessary to begin designing the actual solutions for those workgroups and selecting hardware for use in them The info...

Page 64: ...twork segment The available devices are listed in Table 6 1 below The columns in Table 6 1 indicate some of the most important data to be considered when selecting networking devices for a particular...

Page 65: ...ent support Cabletron Systems SNMP implementation which includes the functions of SNMP Management Information Base II MIB II and the Cabletron Proprietary MIB RMON capable devices include all SNMP fun...

Page 66: ...ort Count Port Count indicates the number of fixed media ports there are on the device In a case where a device has zero ports it means that the device has no dedicated media ports and all connections...

Page 67: ...a small number of stations low data transfer needs and limited expected expansion requirements While most networks of this sort are located in homes or small family businesses the home office descrip...

Page 68: ...rimary selection criteria and one that quickly divides Ethernet networking devices into compliant and non compliant categories Manageable or intelligent devices while more costly than non intelligent...

Page 69: ...later in this chapter Expandability The importance of a smooth and simple path for adding users to the home office network is something that while usually not a driving factor in the decision making p...

Page 70: ...These specialized considerations are beyond the scope of this document but a large amount of information can be found in the Cabletron Systems Networking Solutions Product Guide Design Example The exa...

Page 71: ...vices the Network Designer removes those intelligent devices from the selection field The products removed from the field are not fully discarded from consideration however If the remaining non intell...

Page 72: ...criteria prove that the remaining devices in the selection field do not measure up to the network s needs these can be reintroduced to the selection field The easiest decision in the process of home...

Page 73: ...etworks within a larger facility or to departmental workgroups that are connected through their native networking technology to other portions of the corporate or facility network The small office unl...

Page 74: ...devices The benefits of management come at a cost of higher final product prices and may not be fully recognized by extremely small or simplistic networks The small office level is truly the middle gr...

Page 75: ...ficient port availability to cover the vast majority of small offices without requiring links to other stacks or devices Price As always the price factor must be considered in the network design proce...

Page 76: ...Figure 6 3 with most of the stations 21 located in the Business Office The Business Office also contains three server stations two for file storage and retrieval and one for printing The Loading Dock...

Page 77: ...highest port count to the total station count of the proposed network the Network Designer notices that the SEHI 24 alone does not meet the total required number of stations 27 While it would be possi...

Page 78: ...res a connection to a different networking technology in order to make a connection to a larger or physically separate network In the classical sense this refers to a branch office location that has a...

Page 79: ...on process can begin BRIM Selection As most remote office environments will deal with BRIM capable standalone or stackable devices the selection of the correct BRIM is an essential portion of the netw...

Page 80: ...e certain that the network that is being considered will work the Network Designer consults the table of BRIM interoperability and determines that the BRIM W6 will in fact work properly in the MicroMM...

Page 81: ...ing high throughput Since each Ethernet link is dedicated and will receive traffic from no other sources than the station and the switch if the network is within the allotted limitations the Ethernet...

Page 82: ...even bridges in the longest signal path Since this bridge rule can severely limit the magnitude of networks incorporating per port switching on a large scale the expansion of high end workgroups is of...

Page 83: ...ffective way to provide more bandwidth to each end station is through per port switched Ethernet connections The CAD department consists of 16 CAD designers 2 CAD image file servers and 3 plotters all...

Page 84: ...ificant benefit over those solutions the NBR 620 is removed from consideration This leaves the selection field with the ESX 1320 and ESX 1380 two Ethernet switches that support RMON management one BRI...

Page 85: ...rt the Network Designer finds that the BRIM F6 is the BRIM that is needed This FDDI BRIM requires two FDDI Port Interface Modules or FPIMs Matching the media type of the corporate backbone to the medi...

Page 86: ...There are four classrooms and two labs to be connected to the backbone and there is expected to be growth in the number of Ethernet workgroups at the college in the future The connections from the cl...

Page 87: ...s a series of examples for different Fast Ethernet network approaches Fast Ethernet Workgroup Devices The following sections present and describe the various Cabletron Systems workgroup networking dev...

Page 88: ...that is supplied by Table 6 2 for Ethernet switching devices a These products can be managed through the addition of an intelligent stackable device to their stack Table 7 1 Shared Fast Ethernet Work...

Page 89: ...proposed workgroup as a template for design Small Offices The term small office as it applies to Fast Ethernet installations using Cabletron Systems workgroup devices can be misleading This workgroup...

Page 90: ...o be used If the EPIM slots are all used the Fast Ethernet stack will reach its limitation of 119 users Any Fast Ethernet workgroup containing more than 119 stations will require the creation of anoth...

Page 91: ...he network Examining the selection filed the Network Designer selects the SEHI100TX 22 which provides SNMP management functions As the SEHI100TX 22 is a stack base any non intelligent SEH100TX 22 hubs...

Page 92: ...ations of Fast Ethernet the design approach and decisions required of high end departments using the Fast Ethernet technology do not differ much from those used for normal Ethernet designs In the same...

Page 93: ...t switches are not as easily expanded to accommodate new connections as stackable hubs are it may be wise when designing a Fast Ethernet workgroup to provide extra connections This kind of forethought...

Page 94: ...e a compliant device for this network implementation the Network Designer examines the Cabletron Systems Networking Solutions Product Guide to determine the fitness of the FN100 16TX for this particul...

Page 95: ...st Ethernet switch but the connections in the backbone solution are made to workgroups rather than individual stations Design Example As an example of the methods used to design a switched Fast Ethern...

Page 96: ...ures or performance losses are exceedingly difficult to troubleshoot Access to the three shared file servers Archive1 Archive2 and StockPhoto is required by all departments and users have been complai...

Page 97: ...Server Optimizations These switched station connections will provide full Fast Ethernet speed connections to each of the fileservers While this will introduce a switch into the path from any station...

Page 98: ...BRIM The Network Designer examines the available BRIMs that can be placed in the MicroMMAC 24Es The BRIM E100 when configured with the proper Fast Ethernet Interface Modules will provide a Fast Ethern...

Page 99: ...ner than the other technologies treated in this document Token Ring Workgroup Devices The following sections present and describe the various Cabletron Systems workgroup networking devices that may be...

Page 100: ...s field a These products can be managed through the addition of an intelligent stackable device to their stack Table 8 1 Token Ring Workgroup Devices Product Type Max Management Media Port Count PIMs...

Page 101: ...ign Process The procedures and decisions involved in designing a Token Ring network are quite straightforward and simple Once it has been established that all the station cabling is within the allotte...

Page 102: ...ps the easiest and most straightforward portion of the Token Ring network design process As all of the Cabletron Systems standalone Token Ring networking products are also stackable devices any time a...

Page 103: ...and has decided that a single 16Mbps Token Ring network will offer the necessary performance and reliability to this network The cabling to be used will be Category 5 UTP cable and all the cable runs...

Page 104: ...I 24 and four TPIMs of a matching media type and connect the two devices through the RI RO ports This solution while ideal in situations where users are widely dispersed or located in separate facilit...

Page 105: ...or 24 ports of station connectivity The addition of an STH 24 to the STHI 24 already in the design would supply 48 ports of Token Ring station connectivity and four RI RO ports for future links if re...

Page 106: ...Token Ring 8 8 Token Ring Workgroup Design...

Page 107: ...rnet Workgroup Devices Product Type Max Management Media Port Count PIMs BRIMs MR9T E repeater NONE UTP 8 1 EPIM SEH 22 32 stackable NONEa UTP 12 1 EPIM SEH 24 34 stackable NONEa UTP 24 2 EPIMs SEH 22...

Page 108: ...a Port Count Switch Interfaces PIMs BRIMs NBR 220 SNMP 0 2 2 EPIMs NBR 420 SNMP 0 4 4 EPIMs NBR 620 SNMP 0 6 4 EPIMs 2 BRIMs FN10 SNMP UTP 12 24 12 24 0 ESX 1320 RMON UTP 12 13 1 BRIM ESX 1380 RMON Mu...

Page 109: ...0 FN100 16TX SNMP UTP 16 16 0 FN100 8FX SNMP Multimode Fiber Optics 8 8 0 FN100 16FX SNMP Multimode Fiber Optics 16 16 0 Table A 5 Token Ring Workgroup Devices Product Type Max Management Media Port C...

Page 110: ...T Ethernet UTP RJ45 EPIM X Ethernet AUI DB15 Female Fast Ethernet Interface Module 100TX Fast Ethernet UTP RJ45 Fast Ethernet Interface Module 100FX Fast Ethernet Multimode Fiber Optics SC Fast Ether...

Page 111: ...Fiber Optics SC APIM 11 ATM TAXI Multimode Fiber Optics SC APIM 21 ATM OC3c Multimode Fiber Optics SC APIM 22 ATM OC3c Single Mode Fiber Optics SC APIM 29 ATM STS3c UTP RJ45 APIM 67 ATM DS3 Thin Coaxi...

Page 112: ...nnector Type BRIM E6 Ethernet EPIM BRIM E100 Fast Ethernet EPIM BRIM F6 FDDI FPIM 2 BRIM A6 ATM APIM BRIM A6DP ATM APIM 2 BRIM W6 WAN WPIM Table A 8 BRIM Interoperability Table BRIMa MicroMMAC 22 24 3...

Page 113: ...Table A 9 Ethernet Standard Distance Limitations Media Max Distance Thick Coax 500 m Thin Coax 185 m Standard AUI 50 m Office AUI 16 5 m UTP 100 m Fiber Optics Multimode 1000 m Fiber Optics Single Mo...

Page 114: ...t Ethernet 100BASE TX FX Distance Limitations Media Max Distance UTP 100 m Fiber Optics Multimode 412 m Table A 12 Fast Ethernet Maximum Network Radii Repeater Class UTP UTP Fiber Optics Fiber Optics...

Page 115: ...Cable Type Max of Stations Max Lobe Length 4 Mbps 16 Mbps 4 Mbps 16 Mbps STP active IBM Types 1 2 250 250 300 m 150 m IBM Types 6 9a 250 136 200 m 100 m passive IBM Types 1 2 250 250 200 m 100 m IBM...

Page 116: ...Media Max Distance 4 Mbps Max Distance 16 Mbps Shielded Twisted Pair 770 m 346 m Unshielded Twisted Pair Category 3 4 200 m 100 m Category 5 250 m 120 m Fiber Optics Multimode 2000 m 2000 m Fiber Opt...

Page 117: ...1 STP cabling only Table A 16 FDDI Distance Limitations Media PMD Standard Max Link Distance Fiber Optics Multimode MMF PMD 2 km Fiber Optics Single Mode SMF PMD 60 km Unshielded Twisted Paira TP PMD...

Page 118: ...Charts and Tables A 12 Networking Standards and Limitations...

Page 119: ...rns the operation of devices connecting to Ethernet thin coaxial cable 10BASE5 IEEE standard which governs the operation of devices connecting to Ethernet thick coaxial cable 10BASE FL IEEE standard w...

Page 120: ...raffic to be passed between the separate networks when necessary Bridges read in packets and decide to either retransmit them or block them based on the destination to which the packets are addressed...

Page 121: ...cting signals on another strand or set of strands CSMA CD Carrier Sense Multiple Access with Collision Detection CSMA CD is the basis for the operation of Ethernet networks CSMA CD is the method by wh...

Page 122: ...M ports of two separate dual attached concentrator devices providing fault tolerance EEPROM Electronic Erasable Programmable Read Only Memory Encryption A security process which encodes raw data into...

Page 123: ...an FNB configured chassis to support multiple network technologies simultaneously Frame A group of bits that form a discrete block of information Frames contain network control information or data The...

Page 124: ...s is controlled by the IANA ISO International Organization for Standardization The ISO has developed a standard model on which network operation is based called the OSI Model Jitter Degradation of net...

Page 125: ...he purposes of creating a network or networks Module A discrete device which is placed in a modular chassis to provide functionality which may include but is not limited to bridging routing connectivi...

Page 126: ...del and are encapsulated in frames before being transmitted onto a network media Passive Not utilizing per port reclocking and regeneration of the signal which is propagated throughout the device Comm...

Page 127: ...dia Interface Module A term used to indicate a family of Cabletron Systems Ethernet Media Interface Modules See MIM which are capable of performing their own repeater functions Router A router is a de...

Page 128: ...dges to selectively activate some ports while others remain in a standby condition avoiding the data loops and providing redundant paths in the event of bridge failures SQE Signal Quality Error A self...

Page 129: ...nd pass the token along to the next station in the network Token Ring A network technology which requires that stations only transmit data when they have been given permission by the reception of a To...

Page 130: ...UTP to UTP Glossary 12...

Page 131: ...5 18 Document conventions 1 3 Document organization 1 2 E EPIM 4 3 Ethernet 2 2 6 1 cable lengths 2 2 high end department 6 19 home office 6 5 remote office 6 16 shared devices 6 2 signal path 2 3 sma...

Page 132: ...e office 6 16 Repeater 3 2 Ring In Ring Out 2 6 S Segmentation 5 2 Small office 6 11 7 3 8 3 Stackable 3 4 interconnect cable 3 5 internetworking 3 7 management 3 6 Standalone 3 1 management 3 3 T Tec...

Search results

Summary of Contents for bridges

Reviews:

Related manuals for bridges

Brands by name

Popular brands

Cabletron Systems bridges, Networking Manual

Search results

Summary of Contents for bridges

Reviews:

Related manuals for bridges

Brands by name

Popular brands