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BASIC FDDI NETWORKS

APPENDIX C

BASIC FDDI NETWORKS

This Appendix covers basic Fiber Distributed Data Interface (FDDI)
network operation and concepts that are critical to FDDI network
design and installation. ANSI Standard X3T9.5 provides greater
detail on FDDI access methods and should be referenced whenever
more complete information is needed. Specific areas that are
presented here include:

•

Basic FDDI Concepts

•

FDDI Devices

•

Design and Installation Considerations

BASIC FDDI CONCEPTS

An FDDI network is a high-speed network (100 Mbit/sec.) capable of
reliable data transmission using fiber optic cabling. The fiber optic
media provides increased bandwidth, immunity from electrical noise,
security, and permits the use of longer cable segments making FDDI
a feasible alternative in LAN backbone applications, or as a back-end
or front-end network between processors.

FDDI Media Access Protocol

The FDDI standard X3T9.5 describes the media access and token
passing protocol for FDDI networks. Each station attached to an
FDDI ring is identified by a unique station address, differentiating it
from all other stations. Transmission is controlled through the use of
a special frame called a token.

The token holder is the only station that can transmit. The token
circulates around the ring from station to station. Each station
receives the token from the station preceding it on the ring, retains it
while transmitting data (frames) and then passes (transmits) the
token on to the next active station on the ring.

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Содержание FDMMIM

Страница 1: ... Complete Networking Solution FDMMIM FDMMIM 04 FDMMIM 24 and FDMMIM 30 FDDI CONCENTRATOR ETHERNET to FDDI BRIDGE MODULES INSTALLATION and USER S GUIDE Cabletron Systems P O Box 5005 Rochester NH 03867 0505 ...

Страница 2: ...ES Copyright July 1994 Cabletron Systems Inc P O Box 5005 Rochester NH 03867 0505 All Rights Reserved Printed in the United States of America Part number 9030670 03 July 1994 Multi Media Access Center SPECTRUM Remote LANVIEW and LANVIEW are registered trademarks and FDMMIM FDMMIM 04 FDMMIM 24 FDMMIM 30 FDCMIM 04 FDCMIM 08 FDCMIM 24 FDCMIM 28 IRM IRM 2 IRM 3 IRBM EMME TRMM CXRMIM TPRMIM FORMIM Flex...

Страница 3: ...anual may cause harmful interference to radio communications Operation of this equipment in a residential area is likely to cause interference in which case the user will be required to correct the interference at his own expense WARNING Changes or modifications made to this device which are not expressly approved by the party responsible for compliance could void the user s authority to operate t...

Страница 4: ...intenance checks or adjustments The output is factory set and does not allow any user adjustment Class 1 Laser transceivers comply with the following safety standards 21 CFR 1040 10 and 1040 11 U S Department of Health and Human Services FDA IEC Publication 825 International Electrotechnical Commission CENELEC EN 60825 European Committee for Electrotechnical Standardization When operating within t...

Страница 5: ...dBm or 55x10 6 watts Removing the optical connector from the transceiver allows laser radiation to emit directly from the optical port The maximum radiance from the optical port under worst case conditions is 0 8 W cm 2 or 8x10 3 W m 2 sr 1 Do not use optical instruments to view the laser output The use of optical instruments to view laser output increases eye hazard When viewing the output optica...

Страница 6: ... 2 2 Setting Configuration Switches 2 7 2 2 3 Installing into the MMAC 2 9 2 3 Connecting Fiber Optic Cabling 2 10 2 4 FDMMIM 04 and FDMMIM 24 Master Port Cable Connections 2 13 2 5 Twisted Pair Pinout Configuration 2 13 2 6 Master Ports and LANVIEW 2 14 2 7 FDMMIM and LANVIEW 2 15 2 7 1 Ethernet LEDs 2 15 2 7 2 FDDI LEDs 2 17 CHAPTER 3 CONNECTING TO LOCAL MANAGEMENT 3 1 Connecting a Console 3 1 3...

Страница 7: ... Data 5 14 5 3 2 Ring Map Screen Commands 5 15 5 3 3 Adjusting the Scroll Number n 5 15 5 4 The Node Information Screen 5 16 5 5 The Message Log Screen 5 18 5 5 1 Message Log Data 5 20 5 5 2 Message Log Screen Commands 5 20 CHAPTER 6 SETTING UP THE FDMMIM 6 1 The Setup Screen 6 1 6 1 1 Setup Screen Data 6 2 6 1 2 Setup Screen Commands 6 6 6 2 The Community Names Table Screen 6 7 6 2 1 Community Na...

Страница 8: ...een 8 5 8 3 1 Display Filter Entries Screen Data 8 6 8 3 2 Display Filter Entries Screen Commands 8 7 8 4 Create Filter Entry Screen 8 7 8 4 1 Create Filter Entry Screen Data 8 8 8 4 2 Create Filter Entry Screen Commands 8 9 8 5 Delete Filter Entry Screen 8 9 8 5 1 Delete Filter Entry Screen Data 8 10 8 5 2 Delete Filter Entry Screen Commands 8 10 8 6 Special Database Screen 8 11 8 6 1 Special Dat...

Страница 9: ...CIFICATIONS APPENDIX C BASIC FDDI NETWORKS Basic FDDI Concepts C 1 FDDI Media Access Protocol C 1 Reliability C 3 ANSI Standard X3T9 5 C 4 FDDI Connection Rules C 8 FDDI Devices C 9 Design Considerations for FDDI Networks C 14 Ring Length C 14 Drive Distance C 14 Attenuation C 15 Bandwidth C 15 Number of Stations C 15 INDEX ...

Страница 10: ...ns The FDMMIM FDMMIM 04 and the FDMMIM 24 A and B ports are multimode fiber optic devices The FDMMIM 30 is a single mode fiber optic module that uses a class 1 laser This laser increases the link length from the multimode maximum drive distance of 2 kilometers km to a single mode maximum of 40 km This manual describes how to install the FDMMIM FDMMIM 04 FDMMIM 24 and FDMMIM 30 and explains how to ...

Страница 11: ...the power up diagnostic tests Chapter 4 Getting Started with FDMMIM Local Management explains conventions used in this manual to describe the Local Management screens and summarizes the organization of Local Management Chapter 5 Using the Information Screens describes the following Local Management screens System Information Displays system status information and contains the menu choices that pro...

Страница 12: ...ntrol the participation of the FDMMIM in the Spanning Tree Algorithm Chapter 8 The Filtering Databases explains the purpose of the Acquired Permanent and Special Databases and how to view manipulate their contents Chapter 9 Controlling Concentrator Modules and Ports explains how to enable disable FDDI concentrator modules and ports through the FDDI Configuration screen Appendix A FDMMIM LM Message...

Страница 13: ... FDDI network using translation bridging It contains the A and B ports of a modular Dual Attached Station DAS or Dual Attached Concentrator DAC The FDMMIM works in conjunction with the FDCMIM family of Cabletron Systems FDDI Concentrator Modules These devices provide 4 or 8 M type port connections for various cable types The FDCMIM 04 and FDCMIM 08 have FDDI multi mode connector ports The FDCMIM 2...

Страница 14: ...FDDI FDMMIM SN RESET Y P S S A B B F D D I M O D E M C O N S O L E A F D D I STBY SYOK XMT RCV CLN POK PWR TWR XMT RCV WRP ROP ENET FDDI LINK SMF PMD FDDI FDMMIM 30 SN RESET Y P S S A B B F D D I M O D E M C O N S O L E A F D D I STBY SYOK XMT RCV CLN POK PWR TWR XMT RCV WRP ROP ENET FDDI LINK UTP PMD FDDI FDMMIM 24 SN RESET Y P S S A B B F D D I M O D E M C O N S O L E A F D D I STBY SYOK XMT RCV...

Страница 15: ...mode This feature maintains ring continuity if the bridge module loses power The MMAC Ethernet A Bus provides the Ethernet interface Ethernet traffic accesses the bus through the EMME Ethernet Management Module with Ethernet IRM Intelligent Repeater Module series or any Cabletron Ethernet Management Module Figure 1 3 represents a typical FDDI to Ethernet bridge Figure 1 2 Optical Bypass Switch ...

Страница 16: ...IEW is a visual diagnostic and status monitoring system developed by Cabletron Systems LEDs on the FDMMIM front panel indicate the status of the FDMMIM and can help identify module and physical layer problems Hot Swapping Like all Cabletron Systems Media Interface Modules you can remove the FDMMIM from and insert it into an MMAC without turning off the power to the rest of the modules in the hub ...

Страница 17: ...red settings when the FDMMIM loses power or is turned off Source Address Table Size The FDMMIM uses a learning and filtering algorithm and can retain up to 8 192 source address static or dynamic table entries Spanning Tree Algorithm The FDMMIM supports both 802 1d and DEC Spanning Tree Algorithm STA protocols FlASH EEPROM Memory Support As Cabletron Systems makes enhancements to Local Management y...

Страница 18: ...you install the FDMMIM The battery is disabled for shipment If you do not activate the battery all bridge configuration settings reset to default values when you turn off the power 2 1 BEFORE YOU INSTALL THE FDMMIM Installing an FDMMIM is a simple process of setting the switches and battery jumper sliding the module into an MMAC slot and connecting the fiber optic cables But before you start the i...

Страница 19: ...lace full width modules in the first slot of an MMAC When not using half width management modules leave the first slot empty An MMAC 5FNB can hold four MIMs one management module and two power supplies By removing one power supply the MMAC 5FNB can hold an extra MIM assuming that the remaining power supply has enough capacity to handle the combined load of the resident MIMs FDDI MIMs consume more ...

Страница 20: ...presents an MMAC M8FNB equipped with a full complement of power supplies two FDCMIM 08s and one FDMMIM 04 The MMAC power supplies produce up to 80 amps of power providing more than double the power necessary for operation This configuration provides redundant power to the hub 80 0 amps MMAC M8FNB Dual Power Supply Output 11 8 amps FDCMIM 08 11 8 amps FDCMIM 08 12 5 amps FDMMIM 04 Figure 2 3 FDDI M...

Страница 21: ...DMMIM and an FDCMIM An FDCMIM is not required it merely adds master ports to the FDMMIM concentrator 2 1 3 IRM 3 and Ethernet MIMs with FDMMIMs This example uses the IRM 3 but the same guidelines apply if you are using an IRM IRM 2 or IRBM In the example configuration shown in Figure 2 4 the MMAC 5FNB has an IRM 3 in slot 1 and TPMIM 22s in slots 2 and 3 Slot 4 holds an FDMMIM 04 and slot 5 holds ...

Страница 22: ...ater interface controller family of MIMs RMIM TPRMIM CXRMIM and FORMIM RMIMs can take full advantage of the MMAC s Flexible Network Bus FNB making them unique You can configure the RMIMs to use either the B or C bus of the FNB This means that an RMIM can put Ethernet traffic on MMAC buses that normally see Token Ring and FDDI traffic The EMME can manage Ethernet traffic on the A bus the dedicated ...

Страница 23: ...our RMIM documentation 2 2 INSTALLING THE FDMMIM Caution Observe all static precautions when handling boards Always leave the FDMMIM inside the protective bag when the MIM is not installed in an MMAC If you need to set the MIM down during installation set it on a clean non conducting surface Before you actually install the FDMMIM into the MMAC you must activate the battery and set any bridge confi...

Страница 24: ...es only a few of them See Figure 2 6 Note At power up configuration switch settings override Local Management settings This means that when you cycle MMAC power or reset the FDMMIM LM settings default to their corresponding configuration switch settings Locate the switch bank along the top edge of the FDMMIM and FDMMIM 30 Figure 2 5 On the FDMMIM 04 and FDMMIM 24 the switch bank resides just below...

Страница 25: ...ward broadcast packets OFF Filter broadcast packets 2 Not used 3 Not used 4 ON Multimode Fiber OFF Single Mode Fiber 8 ON Normal OFF Manufacturing use only 7 BOOTP toggle switch for emergency boot up and download use only see Chapter 6 6 Not used 5 Not used Note Switch 4 does not affect operation this switch simply tells LM whether it is a Multimode or Single Mode board Figure 2 6 Configuration Sw...

Страница 26: ...in the MMAC chassis Be sure that both the bottom and top edges of the card rest in the guide slots See Figure 2 7 3 Slide the FDMMIM into the MMAC until you feel it meet the backplane At this point the front panel should be about 1 2 inch from being flush with the rest of the modules in the MMAC 4 Press gently to seat the module into the backplane Do not try to force the module into place or use t...

Страница 27: ...R XMT RCV WRP ROP ENET FDDI LNK POK LNK POK LNK POK LNK POK 1 2 3 4 Figure 2 7 Installing the FDMMIM into the MMAC 2 3 CONNECTING FIBER OPTIC CABLING You can install the FDMMIM as a Dual Attached Station DAS with or without an optical bypass switch Figure 2 8 illustrates the main ring cabling to the FDDI A and B ports on the FDMMIM Figure 2 9 shows the duplex cable connections to the A and B ports...

Страница 28: ...at automatically isolates the FDMMIM from the ring if the FDMMIM fails or the FDMMIM power source fails The bypass switch is optional If you use this optional device you should remember the following A bypass switch causes some signal loss which may cause you to exceed the maximum allowable loss between stations Bypass technology can protect only a small number of consecutive bypassed stations The...

Страница 29: ... install the bypass switch with the FDMMIM powered up it can take up to five seconds before the FDMMIM recognizes the switch 1 Attach the main ring cables to the optical bypass switch by inserting the A and B duplex connectors into their respective keyed receptacles on the optical bypass switch 2 Attach the small bypass cable connector at the FDMMIM Bypass receptacle Figure 2 10 shows the bypass s...

Страница 30: ...l ring You can also attach M ports to the A and B ports of another concentrator to create a dual homing redundant concentrator configuration Refer to Appendix C Basic FDDI Networks for additional information on dual homing 2 5 TWISTED PAIR PINOUT CONFIGURATION This section provides the RJ 45 pinout configuration for Unshielded Twisted Pair UTP and Shielded Twisted Pair STP Physical Layer Medium De...

Страница 31: ...of that M type port PST PORT STATUS This multi state LED can indicate the following Green The station attached to the port is connected to the network RJ 45 TP PMD PORT Pin 1 Contact Signal 1 2 3 4 5 6 7 8 Transmit Transmit N A N A N A N A Receive Receive Caution Ground only one end of an STP segment For Cabletron TP PMD products the port casing is grounded ...

Страница 32: ...ink the port generates an idle signal when not transmitting data 2 7 FDMMIM AND LANVIEW LANVIEW gives you a window into the physical layer of your network The FDMMIM has two sets of system bridge LEDs One set indicates activity on the Ethernet side of the bridge the other set of LANVIEW LEDs shows FDDI information 2 7 1 Ethernet LEDs Figure 2 11 shows the six Ethernet LEDs identified as ENET on th...

Страница 33: ...idge remains in the Learning state if there is at least one other parallel bridge in the network serving as the root bridge SYOK SYSTEM OK When ON this green LED indicates that the FDMMIM has passed all self tests XMT TRANSMIT When ON this green LED indicates that the bridge is transmitting traffic to the Ethernet network On a network with average traffic the XMT LED normally flashes RCV RECEIVE W...

Страница 34: ...ndicates an undesirable cable connection TWR illuminates when you connect A to A or B to B instead of A to B and B to A The FDMMIM supports undesirable configurations Appendix C summarizes FDDI connection rules XMT TRANSMIT When ON this green LED indicates that the FDMMIM is transmitting traffic to the FDDI network On a network with average traffic the XMT LED normally flashes RCV RECEIVE When ON ...

Страница 35: ...M detects an FDDI ring wrap meaning that there is a break in the ring and the system has combined the primary and secondary rings into one ring ROP RING OP When ON this green LED indicates that the Token Claim Process has completed successfully and the FDDI ring is operational ...

Страница 36: ...t supports asynchronous communication through a Digital Equipment Corporation DEC VT220 or VT320 terminal or a PC emulation of one of these terminals A Console Cable Kit included with your FDMMIM contains cables and adapters to connect the RJ 45 CONSOLE port to another RJ 45 port a DB 9 port or a DB 25 port of a terminal Figure 3 1 shows the pin configuration required for the console port You must...

Страница 37: ... VT220 7 Bit Control VT320 7 Bit Control Cursor Keys Normal Cursor Keys Communications Set Up Menu Transmit Transmit 9600 Receive Receive Transmit XOFF XOFF at 64 Bits Parity 8 Bits No Parity Stop Bit 1 Stop Bit Local Echo No Local Echo Port VT220 EIA Port Data Leads Only VT320 DEC 423 Data Leads Only Transmit Any option Auto Answerback No Auto Answerback Keyboard Set Up Menu Keys Typewriter Keys ...

Страница 38: ...rt Pin Configuration To access Local Management 1 Using the components of the Console Cable Kit connect the RJ 45 end of the RS 232 cable to the port labeled CONSOLE on the FDMMIM 2 Connect the other end of the RS 232 cable into the COMM port on the terminal or a communication port on a PC The Console Cable Kit contains adapters to connect to either a DB 9 or DB 25 port 3 Turn on the terminal Afte...

Страница 39: ...ont panel the FDMMIM runs thirteen diagnostic tests If your Local Management console is on the FDMMIM displays the results of each test If a test fails Local Management stores that result in the Message Log If any test fails you should contact Cabletron Systems Technical Support Here is a brief description of each FDMMIM diagnostic test CHECKSUM TEST When you power up the FDMMIM the code downloads...

Страница 40: ...ter a frame enters the FDMMIM Port A Port B or the FNB it enters the Media Access Control MAC circuitry The FDDI tests 1 2 3 and Loopback check the FDMMIM internal data paths ETHERNET PORT SELF TEST This test checks the internal data paths used by a frame that enters the FDMMIM through the Ethernet port This test does not transmit any signal onto the network HARDWARE FILTER TEST The bridge filter ...

Страница 41: ...e Figure 3 2 3 Press the straightened paper clip end into the RESET hole at the top of the FDMMIM front panel After depressing the microswitch in the RESET hole the FDMMIM Ceases operation Clears the contents of RAM Downloads the code in FLASH memory to RAM Runs its power up diagnostic tests Resetting the FDMMIM has the same effect as turning the MMAC power off and on except that it does not affec...

Страница 42: ...1 UNDERSTANDING THE SCREENS AND COMMANDS Local Management lets you control FDMMIM bridge parameters and ports of adjacent FDDI modules To change a setting Open the appropriate screen Highlight a field Type in the new information or use the RETURN key to toggle between available field choices Local Management screens displayed in this manual use the following format conventions Menu choices and com...

Страница 43: ...for a field Highlight the field and then press the RETURN key on the keyboard until the selection you want appears Note When you make changes to screen fields be sure to execute the SAVE command before you exit from the screen Here are a few navigation hints to remember The TAB key performs the same function as the right arrow Backspace permits correction of entries Most screens present RETURN as ...

Страница 44: ...TEM INFORMATION View FDMMIM status and network activity Access all major LM screens COMMUNITY NAMES Set permission levels for local and remote access MESSAGE LOG History log showing warning and error messages reported by LM FDDI CONFIGURATION Display and control FDDI modules within the hub TFTP DOWNLOAD Set conditions for updating LM firmware PASSWORD SCREEN Access FDMMIM Local Management screens ...

Страница 45: ... Management Warning and Error The Message bar display remains on the screen for a short period and then disappears You can edit the Message Bar display duration in the Setup screen All Error and Warning messages not relating to station management are saved in the Message log Appearing in Most Screens The Ethernet Address is a unique factory set address for the FDMMIM Ethernet Port shown in canonic...

Страница 46: ...oblem has been detected with the FDMMIM or its nearest upstream neighbor A trace is being sent to notify the nearest upstream neighbor of the problem Status Bridge Status indicates the current status of the FDMMIM Three potential status conditions could appear in this field On Line The FDMMIM is fully operational Standby In Standby with STA enabled the FDMMIM bridge is learning address information...

Страница 47: ...a hardware malfunction or some condition impacting network service Appearing in the Setup Screen Only Bridge Name a changeable text field shows the user assigned name for the bridge The bridge name helps a network manager identify the bridge using a remote management tool The default bridge name is Cabletron Enet FDDI Bridge Location a changeable text field shows a user defined description of the ...

Страница 48: ...idge Forward Delay 15 seconds 4 to 30 sec Bridge Protocol Bridge Hello Time 2 seconds 1 to 10 sec Bridge Protocol Bridge Max Age 20 seconds 6 to 40 sec Bridge Protocol Bridge Name Cabletron Enet FDDI Setup Bridge up to 32 chars Bridge Priority 8000 0 to FFFF Bridge Protocol Chassis Type MMAC 8 MMAC 3 5 8 Setup Dynamic Ageing Time 300 seconds Filtering 10 to 1000000 sec Database FDMMIM Slot Locatio...

Страница 49: ...Parameter Default Range Edit Screen Community Names Basic Read public Community Read Only public Names Read Write public Superuser RETURN key up to 32 chars Date None MM DD YY Setup IP Address 0 0 0 0 Setup 0 0 0 0 to 255 255 255 255 Password RETURN key Community up to 32 chars Names Subnet Mask 255 255 0 0 Setup 0 0 0 0 to 255 255 255 255 Time None HH MM SS Setup Table 4 2 FDMMIM Defaults ...

Страница 50: ...elds in the information screens 5 1 THE SYSTEM INFORMATION SCREEN The System Information screen is the first screen you see after you successfully log on to Local Management This screen does not have any fields that you can update It is strictly a status screen an overview of general settings and network activity However the System Information screen provides the starting point for access to all o...

Страница 51: ... 00 1D 06 A4 D2 Master Port Count 4 RING MAP SETUP EXIT Figure 5 1 System Information Screen 5 1 1 NETWORK TRAFFIC Data NETWORK TRAFFIC gives you a summary of frame activity since the last time the FDMMIM was reset or the counters cleared Traffic statistics ignore frame type Ethernet or FDDI See section 5 2 for information on the Network Traffic screen The System Information screen provides the fo...

Страница 52: ...owing FDDI information Ring State shows the current ring state Refer to Chapter 4 Getting Started with FDMMIM LM for possible ring state conditions and their definitions Ring Op Count keeps track of the number of times the FDDI ring has initialized since the last time the FDMMIM was reset If this number grows steadily it means that the ring is unstable MAC Configuration describes the current confi...

Страница 53: ...the MAC from PHY B Secondary In to MAC to Primary Out PHY B PHY A is disconnected MAC WRAP B FDDI A FDDI B PRIMARY OUT SECONDARY IN PRIMARY IN SECONDARY OUT Isolated Both PHY A and PHY B are isolated from the ring MAC ISOLATED FDDI A FDDI B PRIMARY OUT SECONDARY IN PRIMARY IN SECONDARY OUT Note Dotted line indicates unused path or connection Note Dotted line indicates unused path or connection Not...

Страница 54: ...y announce its address and basic station description Master Port Count shows the number of available M type ports 5 1 3 FILTER DATABASE Data The FILTER DATABASE section of the System Information screen describes the Acquired and Permanent Database In addition this screen provides access to the Filter Database screen Create Filter Entry screen Delete Filter Entry screen and Special Database screen ...

Страница 55: ...PROTOCOL Data The BRIDGE PROTOCOL section of the System Information screen describes the Spanning Tree Algorithm STA This section also provides access to the Bridge Protocol screen and Port Parameters screen where you can edit the Spanning Tree settings STA is the method that bridges use to decide which bridge is the controlling Root bridge when 2 or more bridges exist in parallel You can control ...

Страница 56: ...mation to the Filtering Database The bridge is monitoring BPDU traffic while preparing to move from the Learning to the Forwarding state FORWARDING The bridge is on line and this port is forwarding traffic BLOCKING The port will not forward any traffic through the bridge Bridge Priority displays the part of the bridge address containing the identifier Spanning Tree uses this identifier for priorit...

Страница 57: ...of the FDDI concentrator ports including other FDDI concentrator modules FDCMIMs that reside in adjacent MMAC slots The FDDI Configuration screen lets you enable and disable concentrator modules and individual M type ports FILTER DATABASE gives access to the screen where you display entries in the Acquired Permanent and Special Databases BRIDGE PROTOCOL gives access to the Bridge Protocol and Port...

Страница 58: ...NETWORK TRAFFIC command in the System Information screen and press RETURN 04 02 94 08 43 23 NETWORK TRAFFIC Ethernet Address 00 00 1D 06 F9 C2 Ring State Ring Op FDDI Address 00 00 B8 60 9F C3 Status On Line ETHERNET FDDI FRAMES BRIDGE MGMT SMT Received 204451 1728 0 0 Filtered 53 109214 100 1728 0 Forwarded 93134 0 0 Transmitted 2 71521 1846 Ethernet Exceptions FDDI Exceptions Rx CRC 0 Rx Errors ...

Страница 59: ...g other functions may have lost track of the total number of filtered frames The FDMMIM displays a continuation from the last known number of filtered frames To clear the plus sign reset the counters Forwarded shows the total number of frames forwarded from one network to the other Ethernet to FDDI or FDDI to Ethernet Transmitted shows the total number of SMT and BPDU frames sent by the FDMMIM fro...

Страница 60: ... have more than 1 518 data bytes not including the preamble the IEEE 802 3 maximum Rx IP Frag Err Shows the number of frames the FDDI only FDDI port could not fragment for transfer to Ethernet Possible causes The frame was too large for unfragmented transfer and was not using IP network protocol Fragmentation was not allowed The IP frame header failed its checksum test prior to attempting fragment...

Страница 61: ...he inability of the bridge to transmit frames onto a non operating FDDI ring 5 2 2 Network Traffic Screen Commands RETURN closes the Network Traffic screen and returns you to the System Information screen RESET COUNTERS sets all counters within the bridge to zero Note When you reset the counters you reset ALL Local Management counters to zero including those displayed on the System Information scr...

Страница 62: ...RING MAP Ethernet Address 00 00 1D 06 F9 D6 Ring State Ring Op FDDI Address 00 00 B8 60 9F EB Status On Line Uptime 10 Days 22 Hours 01 Minutes FDDI Port 00 00 B8 60 9F EB Address Mode MAC MAC Count 3 00 00 B8 60 9F EC DAC DAC 00 00 B8 40 02 92 00 00 B8 C0 E1 F0 DAS RETURN CHANGE ADDRESS MODE SCROLL DOWNSTREAM 1 SCROLL UPSTREAM 1 Figure 5 3 FDDI Ring Map Screen Under some conditions the display mu...

Страница 63: ...A and B ports DAC Dual Attached Concentrator Station that supports M ports and connects directly to an FDDI primary and secondary ring using A and B ports SAS Single Attached Station Station that accesses the main ring through a concentrator creating a ring of trees topology SAC Single Attached Concentrator Station that accesses the main ring through another concentrator and in turn allows the con...

Страница 64: ...dresses shift around the ring in a counterclockwise direction The n controls the number of shifts upstream If the Ring Map contains only one node scroll commands are not displayed 5 3 3 Adjusting the Scroll Number n When using the Scroll Upstream n or Scroll Downstream n commands the n allows you to control the number of shifts made with each command execution Note You need a minimum of four FDMMI...

Страница 65: ...ss RETURN 04 02 94 08 44 34 NODE INFORMATION Ethernet Address 00 00 1D 06 F9 D6 Ring State Ring Op FDDI Address 00 00 B8 60 9F EB Status On Line Uptime 10 Days 22 Hours 01 Minutes Selected Node Address 00 00 B8 60 9F EC Upstream Address 00 00 B8 40 02 92 Node Class DAS MAC Count 1 Non Master Count 2 Master Count 0 Peer Wrap NO Unattached Conc NO Twisted A A NO Twisted B B NO Synchronous Service NO...

Страница 66: ...no active A or B port Twisted A A indicates the A port of the selected node connects to the A port of another node an undesirable configuration The FDMMIM accepts undesirable configurations Appendix C summarizes FDDI connection rules Twisted B B indicates the B port of the selected node connects to the B port of another node an undesirable configuration The FDMMIM accepts undesirable configuration...

Страница 67: ...verifies that the action has taken place Warning When you request an action that Local Management cannot complete a Warning explains the problem For example if you enter text into a field that can only accept numeric data a Warning appears Warnings can also indicate a problem that could affect some aspect of bridge operation or eventually escalate into an error For example the FDMMIM produces a Wa...

Страница 68: ...ge 10 07 04 94 08 43 11 WARNING A A connection accepted 9 07 04 94 08 43 00 MESSAGE FDMMIM Selftest Complete 8 07 04 94 08 42 22 WARNING A A connection accepted 7 07 04 94 08 42 11 MESSAGE FDMMIM Selftest Complete 6 07 04 94 08 34 29 WARNING M M connection rejected 5 07 04 94 08 32 27 WARNING B B connection rejected 4 07 04 94 08 31 34 WARNING Bridge restarting 3 07 04 94 08 31 23 WARNING NO HARDW...

Страница 69: ...est number listed first Date The date of the log entry Time The time of the log entry Message The text of the Message Error or Warning Local Management highlights Errors by displaying them in bright blinking text See Appendix A for complete descriptions of each Local Management Warning and Error message along with probable causes and recommended actions 5 5 2 Message Log Screen Commands RETURN the...

Страница 70: ...nstructions and guidelines for setting up a UNIX workstation to handle an image file download 6 1 THE SETUP SCREEN The Setup screen is where you access the Community Names Table and TFTP Code Download Setup screens and where you set the following general FDMMIM parameters Bridge Name Location Port Name Ethernet and FDDI ports Network Name Ethernet and FDDI Message Duration Time Screen Refresh Time...

Страница 71: ...42 ERASE ACQUIRED DATABASE Set IP Address 0 0 0 0 ERASE PERMANENT DATABASE Set Subnet Mask 255 255 0 0 Chassis Type MMAC 8 FDMMIM Slot Location SLOT 1 Type of STA Protocol 802 1 RETURN COMMUNITY TABLE TRAP TABLE SAVE DOWNLOAD Figure 6 1 Setup Screen 6 1 1 Setup Screen Data The Setup screen contains the following information Last Reset indicates how long the FDMMIM has been running since the last p...

Страница 72: ...me is a text field that shows the names assigned to the Ethernet and FDDI ports A Port Name helps identify a bridge port to someone using a remote management tool Defaults FDDI Port and Ethernet Port You can create a Port Name that contains up to 32 keyboard characters including spaces Network Name is a text field that shows the names assigned to the Ethernet and FDDI networks A Net Name helps ide...

Страница 73: ...iods as follows 255 255 255 255 Default 0 0 0 0 255 is the maximum number that can be entered in any of the four fields Set Subnet Mask lets you define the portions of the received IP addresses that will be interpreted as network identifiers and the portions that will be interpreted as host identifiers The default subnet mask uses the first two portions of the IP address to identify the net id lea...

Страница 74: ...hown in their true locations The Chassis Type and FDMMIM Slot Location fields have no affect on FDMMIM operation they only enhance the FDDI Configuration screen display If you have Chassis Type and Slot Location set to an impossible configuration the chassis type takes precedence over the Slot Location For example if you have your FDMMIM physically installed in Slot 4 of an MMAC 8 but you have Cha...

Страница 75: ... running causes STA to start over in Listening mode See section 5 1 4 BRIDGE PROTOCOL Data for additional information ERASE SPECIAL DATABASE erases all special database entries See Chapter 8 The Filtering Databases for additional information regarding the Special Database ERASE ACQUIRED DATABASE erases all acquired database entries See Chapter 8 The Filtering Databases for additional information r...

Страница 76: ...EAD READ ONLY and READ WRITE SUPER USER Community names provide different access privileges in remote management Note Make sure to remember the SUPER USER SU community name This name acts as the ONLY Local Management password To open the Community Names Table screen In the Setup screen highlight COMMUNITY TABLE and press RETURN 04 02 94 08 43 23 COMMUNITY NAMES TABLE Ethernet Address 00 00 1D 06 F...

Страница 77: ...ssible data At this time READ WRITE and SUPER USER have identical operation privileges In future implementations of Local Management views will be defined within the FDMMIM s MIBs that are specific to each access level To control remote access to the FDMMIM edit the Community Names list Each of the four Community Names is a password that you must enter into a remote access tool before it can gain ...

Страница 78: ... define the location of the system that holds the download file and direct the download to place the new code into the FDMMIM s RAM the FLASH EEPROM or both Refer to section 6 4 Image File Download with UNIX or to your specific remote management documentation for downloading instructions guidelines To open the TFTP Code Download screen Highlight DOWNLOAD from the Setup screen command menu and pres...

Страница 79: ...re The download occurs the next time the FDMMIM is rebooted reset Server IP Address is the IP address of the networked server that holds the file to be downloaded Filename is a text field where you specify the pathname to and the file name of the new FDMMIM software The Filename field can hold up to 69 characters 6 3 2 TFTP Code Download Setup Screen Commands RETURN closes the TFTP Code Download s...

Страница 80: ...e file download The instructions include command examples where appropriate Bold lettering in examples indicates operator entry Caution If unsure how to properly configure your UNIX workstation using these guidelines contact your Systems Administrator or local UNIX wizard Before you start Editing ethers or hosts files requires Root Superuser access Downloading an image file requires setting up you...

Страница 81: ... rarpd a 5 Ensure that the tftpboot directory is not owned e g unix chown nobody tftpboot 6 Store the hex image file in the tftpboot directory as fdm hex Note This step requires decompression of the zipped image file If you do not have a UNIX unzip utility access to a PC with pkunzip or a way to FTP the decompressed image to your UNIX workstation contact Cabletron Technical Support 7 Edit the etc ...

Страница 82: ...ess Enter The TFTP CODE DOWNLOAD SETUP screen appears 2 Highlight and set the following parameters on the TFTP CODE DOWNLOAD SETUP screen Force Download Yes Commit to Flash Yes Server IP Address IP address of management station Filename Path to management station for example fdm hex for UNIX 4 Highlight the Save Parameters option and press RETURN 5 Highlight the Cold Boot option and press RETURN T...

Страница 83: ... panel 2 Slide the MIM out of the chassis until you can easily access the FDMMIM switch panel located at the top of the mother board See Figure 6 4 ON 1 2 3 4 5 6 7 8 Switch 7 Top of Module Top of Module CABLETRON SYSTEMS INC PN 9000618 XX FDM MIM REV X MADE IN USA 199X Mother Board P L A I N V I E W B A T T E R I E S PMB3 6B FDMMIM Switch FDM 01 02 00 CABLETRON 199X Figure 6 4 BOOTP Switch 3 Flip...

Страница 84: ...ed for the device to load initial switch positions into memory 4 Slide the FDMMIM back into position 5 Screw in the knurled knobs 6 Power up the MMAC Image file download takes several minutes Following the download access the FDMMIM LM Message Log to ensure no CHECKSUM error occurred If it has repeat steps 1 6 again If the CHECKSUM test continues to fail contact Cabletron Technical Support If the ...

Страница 85: ...on The two Local Management screens that affect Spanning Tree activities are Bridge Protocol Bridge Port Parameters 7 1 THE BRIDGE PROTOCOL SCREEN The Bridge Protocol screen displays the current STA operating parameters and lets you change the following Bridge Max Age Bridge Forward Delay Bridge Hello Time Bridge Priority To open the Bridge Protocol screen Highlight the BRIDGE PROTOCOL command in ...

Страница 86: ...TERS Figure 7 1 Bridge Protocol Screen 7 1 1 Bridge Protocol Screen Data The Bridge Protocol screen contains information about the network s Root bridge and about the FDMMIM Bridge ID is the unique bridge identifier for the FDMMIM The Bridge ID is computed from the bridge address and the bridge priority which is explained later in this section STA compares Bridge IDs to determine the relative prio...

Страница 87: ...h bridge in the network receives a new Configuration BPDU before the ageing timer expires If the timer expires before a new Configuration BPDU is received it indicates that the former Root is no longer active The remaining bridges begin Spanning Tree operation to select a new Root The Bridge Max Age is set by the Root bridge You can edit the Bridge Max Age value but unless the FDMMIM is the Root b...

Страница 88: ...mission of Configuration BPDUs through the bridge port to ensure that Configuration BPDUs are not transmitted too frequently through any bridge port Receiving a Configuration BPDU starts the Hold Timer If the Hold Timer expires the port invokes the Transmit Configuration BPDU procedure which sends configuration change information to the Root The Hold Time value is a fixed value as specified by the...

Страница 89: ... port specific protocol parameters one for each of the bridge ports Ethernet and FDDI To open the Bridge Port Parameters screen In the Bridge Protocol screen highlight the PORT PARAMETERS command and press RETURN 04 02 94 08 44 34 BRIDGE PORT PARAMETERS Ethernet Address 00 00 1D 06 F9 D6 Ring State Ring Op FDDI Address 00 00 B8 60 9F EB Status On Line Uptime 10 Days 22 Hours 01 Minutes Ethernet Po...

Страница 90: ...s last reset or initialized Port State indicates the current state of the port Five states are possible DISABLED Management has disabled this port No traffic can be received or forwarded while the port is disabled LEARNING The bridge is learning network addresses The bridge enters the Learning state during start up or when the STA executes due to a network topology change LISTENING The bridge is m...

Страница 91: ...etwork Designated Bridge displays the Bridge ID of the bridge that is assumed to be the Root bridge on the network Designated Port displays Port ID for the bridge port that is assumed to be the designated port Topology Change Acknowledge indicates the new value of the Topology Change Acknowledgment flag that will be transmitted by the designated bridge in the next Configuration BPDU on the associa...

Страница 92: ... Database 8 1 BRIDGE OPERATION When filtering the bridge uses the contents of the Acquired and or Special Databases to decide whether or not to forward a frame When forwarding the bridge translates from FDDI to Ethernet or from Ethernet to FDDI and sends all frames it receives The bridge initializes the Acquired Database at start up time by copying the contents of the Permanent Database from non v...

Страница 93: ...t to FDDI and then forwards it In the event the bridge cannot locate the destination address in its Acquired Database the bridge forwards the frame If the bridge does not use a Database entry during a fixed length of time the Dynamic Ageing Time it purges the entry from the database This action keeps entries current 8 2 THE FILTER DATABASE SCREEN The Filter Database screen displays current informa...

Страница 94: ...een data section displays status information about the databases and lets you change both the database Dynamic Ageing Time and the type of filtering IEEE 802 1 Special DB or Both Maximum Entries is the maximum number of entries that the Acquired or Permanent Databases can retain Current Entries is the number of entries the Acquired and Permanent Databases currently hold In the Acquired Database co...

Страница 95: ... the Special Database for filter forward decisions Both Uses the contents of both the Acquired Database and Special Database First the bridge applies the Acquired Database to the frame If the frame does not get filtered the bridge applies the Special Database for filter forward decisions 8 2 2 Filter Database Screen Commands RETURN closes the Filter Database screen and returns you to the System In...

Страница 96: ...X Dynamic 3 Index Address Type Enet Port FDDI Port 1 00001D07007B Dynamic Forward Filter 2 000010148BCA Dynamic Forward Filter 3 0000100765DF Dynamic Filter Forward RETURN DISPLAY ENTRIES Figure 8 2 Display Filter Entries Screen To view database entries 1 Select the database that you want to view by highlighting the Database field and pressing RETURN to toggle between Acquired and Permanent 2 Sele...

Страница 97: ...e parameter selection fields This feature lets you refine your address mask to reduce the number of addresses the screen displays or to easily make another selection After entering new parameters you can use the DISPLAY ENTRIES command to display the new filter matches PREVIOUS and NEXT commands let you display succeeding blocks of addresses when the list contains more than ten entries Note When y...

Страница 98: ...u to the Filter Database screen NEXT displays subsequent blocks of filter information This command appears when more than 10 entries exist PREVIOUS displays preceding blocks of filter information This command appears when more than 10 entries exist DISPLAY ENTRIES displays filter entries that match the currently defined type and address mask within the selected database 8 4 CREATE FILTER ENTRY SCR...

Страница 99: ...rent Entries 17 Dynamics 3 Statics 17 Create Entry in Database Permanent Destination Address 00 00 00 00 00 00 Action on frame entering Enet Port Filter Action on frame entering FDDI Port Filter RETURN CREATE Figure 8 3 Create Filter Entry Screen 8 4 1 Create Filter Entry Screen Data Create Entry in Database selects the database where you want to store the address Highlight this field and use the ...

Страница 100: ...ned for this address 8 4 2 Create Filter Entry Screen Commands RETURN closes the Create Filter Entry screen and returns you to the Filter Database screen CREATE ENTRY creates the currently defined address entry You can repeat this command to create another entry 8 5 DELETE FILTER ENTRY SCREEN This screen retains most of the Filter Database screen information Several fields on the lower half of the...

Страница 101: ...lete Filter Entry Screen 8 5 1 Delete Filter Entry Screen Data Database selects the database containing the entry you want to delete Highlight this field and press RETURN to toggle between Permanent and Acquired Address defines the address you want to delete Highlight this field and enter the address in the hex format XX XX XX XX XX XX where XX a value between 00 and FF 8 5 2 Delete Filter Entry S...

Страница 102: ...s 22 Hours 01 Minutes Enable Enet FDDI Dest Address Source Addr Type Data Field 1 No Filter Filter XXXXXXXXXXXX XXXXXXXXXXXX XXXX XXXXXXXXXXXXXXXX 2 No Filter Filter XXXXXXXXXXXX XXXXXXXXXXXX XXXX XXXXXXXXXXXXXXXX 3 No Filter Filter XXXXXXXXXXXX XXXXXXXXXXXX XXXX XXXXXXXXXXXXXXXX 4 No Filter Filter XXXXXXXXXXXX XXXXXXXXXXXX XXXX XXXXXXXXXXXXXXXX 5 No Filter Filter XXXXXXXXXXXX XXXXXXXXXXXX XXXX XX...

Страница 103: ...tion Filter Filter packets that match the respective filter information Dest Address provides the bridge with a destination address to compare with the Destination Address of incoming frames Highlight this field and enter the desired address in the hex integer format XXXXXXXXXXXX where X a value between 0 and F Keeping an X wildcard in any integer position forces a match for that integer Source Ad...

Страница 104: ... provides the bridge with an action to take in the event it cannot find a match within the Special Database For example if the bridge encounters a frame that does not meet any of the Special Database criteria it looks to the default action setting to determine whether to filter or forward the frame 8 6 2 Special Database Screen Commands RETURN closes the Special Database screen and returns you to ...

Страница 105: ...oncentrator functions of the FDMMIM To open the FDDI Configuration screen Highlight FDDI in the System Information screen and press RETURN 04 02 94 08 44 22 FDDI CONFIGURATION Ethernet Address 00 00 1D 06 F9 C2 Ring State Ring Op FDDI Address 00 00 B8 60 9F C3 Status On Line Uptime 10 Days 06 Hours 01 Minutes FDCMIM 04 FDCMIM 04 FDCMIM 04 FDCMIM 04 FDMMIM 04 ENABLED ENABLED ENABLED ENABLED ENABLED...

Страница 106: ... Each FDCMIM slot shown in the FDDI Configuration screen displays the configuration of the resident FDCMIM 04 or FDCMIM 08 The FDCMIM provides M ports for the FDMMIM By itself an FDCMIM cannot connect to the FDDI dual ring so it does not show an FDDI Ring Connection Status field Figure 9 2 shows the fields within a single configuration slot The Concentrator Connection Status field the ENA DIS BOAR...

Страница 107: ...olated ERR indicates that the MIM has failed To change a port s status 1 Highlight the port status ON or OFF next to the port number 2 Press RETURN on the keyboard to toggle the selection 3 Highlight the EXECUTE command at the bottom of the screen and press RETURN FDMMIM 04 ENABLED 1 ON A B 2 ON ON 3 ON 4 ON Concentrator Connection Status Indicates whether or not the M ports are connected to the M...

Страница 108: ...ETURN closes the FDDI Configuration screen and returns you to the System Information screen EXECUTE performs and saves the current port and board configuration on the screen Closing the FDDI Configuration screen without first using the EXECUTE command voids any changes 9 2 CONCENTRATOR STATUS AND BRIDGE OPERATION Changing FDMMIM concentrator fields does not change bridge operation Turning the conc...

Страница 109: ...ning messages tell you that the action you requested did not complete successfully or that a condition exists that you may want to know about Usually the condition requires no response A A connection accepted Cause Connecting an FDDI A port to another A port is undesirable The FDMMIM supports A A connections unless your Connection Policy specifies otherwise Action If possible reconnect the FDMMIM ...

Страница 110: ...t B B connection accepted Cause Connecting an FDDI B port to a B port is an undesirable connection The FDMMIM supports B B connections Action If possible reconnect the FDMMIM s B port cable so that it connects to an A port B B connection rejected Cause Connecting an FDDI B port to a B port is an undesirable connection The FDMMIM rejects B B connections when directed to do so by your Connection Pol...

Страница 111: ...w long an address remains in the Acquired database before being purged Action Enter a valid number All characters in this field must be entered Cause You are editing a field that requires all positions in the field to contain a valid character For example if you are creating an IP address make sure that you have four groups of characters each separated by a period Action Re type the entry Bridge r...

Страница 112: ... press RETURN until the toggle select NONE appears 3 Execute the SAVE command at the bottom of the screen 4 Highlight Type of STA Protocol and select the original setting either 802 1 or DEC 5 Execute the SAVE command Remember while you have STA disabled the bridge is in Standby mode and no packets are forwarded FDDI Trace initiated Cause The FDDI ring is attempting to repair an interruption Actio...

Страница 113: ... protocols causes an unstable network Illegal FDM location in MMAC Cause You specified an MMAC configuration that cannot exist Action Check the FDMMIM installation to determine the MMAC type MMAC3 MMAC5 or MMAC8 Determine the slot number where the FDMMIM resides and enter it into the Setup screen The right most slot bottom in the MMAC3 is slot 1 and reserved for dedicated management modules Illega...

Страница 114: ...our fiber optic cable connectors Link error estimate returned below alarm threshold Cause This indicates that you have a valid link Action No action required M M connection rejected Cause Connecting an M port to an M port is an illegal connection Action Reconnect the M port cable to an S port Message history full Cause The FDMMIM has 100 entries the maximum in the Message log No more entries can b...

Страница 115: ... enter the desired settings If the board remains without power be sure to disable the battery Permanent DB illegal port ID specified Cause Remote management requested an action and named a port that does not exist Action No action required set_port_name illegal port id Cause Internal error Action Contact Cabletron Systems Technical Support set_port_name_net illegal port id Cause Internal error Act...

Страница 116: ...a number that is greater than the numbers that this field can accept Action Retype the entry tick took longer than 1 second Cause Spanning Tree error Action Contact Cabletron Systems Technical Support Too many characters entered Cause You typed more characters than the field can accept Action Retype the entry Unknown address selected for ring map start Cause To display a ring map you must start wi...

Страница 117: ...etron Systems Technical Support BSI BAD_RINGOP_REQ_STATUS Cause Internal error Action Contact Cabletron Systems Technical Support BSI COMPLETED_BEACON_REQ_STATUS Cause Internal error Action Contact Cabletron Systems Technical Support BSI CONSISTENCY_FAILURE_REQ_STATUS Cause Internal error Action Contact Cabletron Systems Technical Support BSI ERROR UID Mismatch Cause Internal error Action Contact ...

Страница 118: ...echnical Support BSI PART_NONE_REQ_STATUS Cause Internal error Action Contact Cabletron Systems Technical Support BSI PREEMPT REQ_STATUS Cause Internal error Action Contact Cabletron Systems Technical Support BSI RESERVED_REQ_STATUS Cause Internal error Action Contact Cabletron Systems Technical Support BSI SERVICE_LOSS_REQ_STATUS Cause Internal error Action Contact Cabletron Systems Technical Sup...

Страница 119: ... There is another station on the ring with the same address as the FDMMIM Action Find the station with the duplicate address and remove it from the ring Next reset the FDMMIM Ethernet port failed self test Cause The FDMMIM Ethernet port has an internal circuit failure that prevents it from connecting to the MMAC Ethernet bus Action Contact Cabletron Systems Technical Support EXT LOOPBACK INJ LS ER...

Страница 120: ...ts it from connecting to the ring Action Contact Cabletron Systems Technical Support FDDI Test 3 failed self test Cause The FDMMIM has an internal circuit failure that prevents it from connecting to the ring Action Contact Cabletron Systems Technical Support FDDI failed self test Cause The FDMMIM has an internal circuit failure that prevents it from connecting to the ring Action Contact Cabletron ...

Страница 121: ...mpleted Action Reset the FDMMIM Hardware filter search address timeout Cause A request to the bridge s filter database hardware could not be completed Action Reset the FDMMIM Hardware filter not installed Cause A request to the bridge s filter database hardware could not be completed Action Reset the FDMMIM Hardware filter test failed Cause There is a problem with the bridge s hardware filter Acti...

Страница 122: ...Invalid hardware filter display counter response Cause A request to the bridge s filter database hardware could not be completed Action Reset the FDMMIM Invalid hardware filter search address response Cause A request to the bridge s filter database hardware could not be completed Action Reset the FDMMIM Local RAM failed self test Cause FDMMIM internal memory has been corrupted Action Contact Cable...

Страница 123: ... Contact Cabletron Systems Technical Support Reset error Cause Internal error Action Contact Cabletron Systems Technical Support Shared RAM failed self test Cause FDMMIM internal memory has been corrupted Action Contact Cabletron Systems Technical Support smt_mib_get hex address failed for this instance Cause Internal error Action Contact Cabletron Systems Technical Support Software reset Cause In...

Страница 124: ... Cause Internal error Action Contact Cabletron Systems Technical Support Unexpected interrupt spurious Cause Internal error Action Contact Cabletron Systems Technical Support Unknown type Cause Internal error Action Contact Cabletron Systems Technical Support ...

Страница 125: ...es have the following characteristics Multimode Transmitter Optical wavelength 1330 nm typical Optical output 20 0 dBm minimum 14 0 dBm maximum Optical rise time 3 5 nsec maximum Optical fall time 3 5 nsec maximum Spectral width 110 nm maximum Supply current 150 mAmps maximum Multimode Receiver Signal Detect Optical wavelength 1330 nm typical Optical input 31 0 dBm minimum 14 0 dBm maximum Optical...

Страница 126: ...ec typical 100 µsec maximum Deassert Time 10 µsec typical 350 µsec maximum Single Mode Transmitter Optical wavelength 1300 nm typical Optical output 19 0 dBm minimum 14 0 dBm maximum Optical rise time 3 5 nsec maximum Optical fall time 3 5 nsec maximum Spectral width 15 nm maximum Supply current 150 mAmps maximum Single Mode Receiver Signal Detect Optical wavelength 1300 nm typical Optical input 3...

Страница 127: ...diameter 128 0 µm maximum 122 0 µm minimum Cable attenuation 2 5 dB km typical Unshielded Twisted Pair as specified in EIA TIA TSB 36 TSB 40 Cable Connector Category 5 Single Mode Fiber as specified in X3T9 5 88 155 section 7 1 Core diameter 8 7 µm 0 5 µm Cladding diameter 127 0 µm maximum Cable attenuation 0 5 dB km typical Cable Length The FDDI standard specifies the following cable lengths Maxi...

Страница 128: ...orwarding and Filtering Forwarding Ethernet to from FDDI 14 880 packets sec Filtering Ethernet 14 880 packets sec FDDI 446 429 packets sec Power Requirements To move data at the FDDI data rate of 100 Mb sec requires that FDDI modules consume more power than Ethernet or Token Ring modules Power requirements vary slightly from one FDMMIM to another depending on the FDMMIM mother board you have To de...

Страница 129: ...MMIM SN 0671 10 5 Amp at 5 Vdc FDMMIM SN 0710 8 0 Amp at 5 Vdc FDMMIM SN 0737 6 0 Amp at 5 Vdc FDMMIM 04 SN 0565 15 3 Amp at 5 Vdc FDMMIM 04 SN 0721 12 5 Amp at 5 Vdc FDMMIM 04 SN 0736 10 9 Amp at 5 Vdc FDMMIM 24 10 5 Amp at 5 Vdc FDMMIM 30 15 3 Amp at 5 Vdc Bridge Database Acquired database capacity 8191 static or dynamic entries MIBs FDDI MIB RFC 1285 MIB II RFC 1213 Bridge MIB RFC 1286 Cabletro...

Страница 130: ...r attenuation and interchannel isolation Attenuation 1 0 dB typical 2 5 dB worst case Interchannel isolation 50 dB Safety This unit meets the safety requirements of UL 1950 CSA C22 2 No 950 and EN 60950 the EMI requirements of FCC Class A and EN 55022 Class A and the EMC requirements of EN 50082 1 Note It is the responsibility of the person who sells the system to which the FDMMIM will be a part t...

Страница 131: ...ndwidth immunity from electrical noise security and permits the use of longer cable segments making FDDI a feasible alternative in LAN backbone applications or as a back end or front end network between processors FDDI Media Access Protocol The FDDI standard X3T9 5 describes the media access and token passing protocol for FDDI networks Each station attached to an FDDI ring is identified by a uniqu...

Страница 132: ... secondary data paths that operate as counter rotating rings Redundant rings facilitate recovery procedures in the event of a ring segment failure This recovery is similar to Token Ring IEEE 802 5 networks and is discussed in greater detail later in this section The FDDI standard defines two ring access methods single attachment and dual attachment see Figure C 1 Dual attached stations DAS and dua...

Страница 133: ...risk of a single node bringing the entire network down To further reduce this vulnerability a redundant data path is provided in the main ring trunk cabling In theory the ring topology requires media that is capable of only one way traffic to achieve the circular flow of data In practice an FDDI ring uses media that provides two fiber optic ring paths a primary ring and a secondary ring The second...

Страница 134: ...ultimode fiber and another SMF PMD for single mode fiber and a Physical Layer Protocol PHY Each section defines a unique entity of the FDDI station architecture and its operation Note Single mode operation is very similar to multimode operation Since the principle difference is the characteristics of the optic transceivers and fiber optic medium only the multimode PMD is discussed here The entitie...

Страница 135: ...a 5 bit symbol for transmission The 5 bit symbols are encoded so that each symbol has at least two bit transitions to assure bit cell synchronization at the remote receiver Decoding reverses this process for the received frames Other functions of the PHY include generation of a 125 Mhz transmit clock synchronization of the receive clock with an upstream transmitter encoding and decoding for media ...

Страница 136: ...nstruct Protocol Data Units PDUs that are passed on to PHY The PDUs consists of a MAC header the encapsulated SDU and a Frame Check Sequence FCS The FCS is generated by the MAC during transmission Preamble 16 Symbols Starting Delimiter 2 Symbols Frame Control 2 Symbols Source Address 4 or 12 Symbols Destination Address 4 or 12 Symbols Information 0 Symbol Pairs Frame Check Sequence 8 Symbols Endin...

Страница 137: ...Ring Management RMT monitors status information from the MAC and Configuration Management and controls several functions related to the health of the ring SMT Frame Services Ring Management Configuration Management MAC Physical Connection Management PHY PMD Bypass Switch optional LAN Management Agent Bypass Switch Control Configuration Path Switch SMT LLC In Out FDDI STATION ...

Страница 138: ... and enforces connection rules screens marginal connections and supports maintenance activities FDDI Connection Rules One of the primary functions of SMT Connection Management is to control physical connections among A B M and S type ports The following table summarizes the FDDI connection rules A V U V V U V B V V U V U V S V U V U V V M V P V P V X A B S M V valid connection X illegal connection...

Страница 139: ...ne active connection Port B If a cable failure severs concentrator 3 s connection to concentrator 2 CFM will activate the Port A connection FDDI DEVICES There are four valid station configurations SAS DAS DAC and SAC These are characterized by the mix of FDDI entities within the station see Figure C 7 All stations must have an SMT and at least one MAC one PMD and one PHY Each physical ring connect...

Страница 140: ... to the ring using Fixed Shroud Duplex FSD media interface connectors Four connectors are defined in the X3T9 5 Physical Layer PMD standard see Figure C 7 They provide proper alignment of the trunk fibers for each of the valid configurations Types A B and M are precision connectors mechanically keyed to assure proper connections to Primary In and Primary Out fibers Types A and B provide dual attac...

Страница 141: ...s often found in other network topologies are not defined as an entity for FDDI networks This is because all devices attached to the FDDI main ring must be capable of compliance with the FDDI protocol They must be dual attached devices having as a minimum two PMD and PHY entities and one MAC and SMT entity Since this is the valid configuration for a DAS or DAC either could serve as a repeater when...

Страница 142: ...the data paths through the switch in both the bypass and operational non bypassed states BYPASS STATE Station Power Off OPERATIONAL STATE Station Power On FDDI Dual Optical Bypass Switch FDDI Dual Optical Bypass Switch FDDI Ring FDDI Ring Station Station Figure C 9 Optical Bypass Switch A concentrator is a hub It provides connections to the dual ring for single attached stations and controls their...

Страница 143: ... bridges enclose the non FDDI frames within the FDDI protocol and therefore must be installed in pairs The sending bridge encapsulates the message and the receiving bridge strips the FDDI protocol restoring the original frame The bridge maintains routing information used to filter prevent frames from crossing the bridge or forward messages across the bridge FDDI to FDDI BRIDGE Ethernet 802 3 Netwo...

Страница 144: ... the same as the fiber path length but if a wrap occurs the length of the fiber path length could nearly double So a safe formula to establish the maximum ring length is to divide the fiber length by two This yields a maximum ring length 100 km one half of the 200 km fiber path length In designing your network you must add up the lengths of the fiber optic cables in your network to determine the t...

Страница 145: ... two Bandwidth The minimum modal bandwidth of fiber optic cable used in an FDDI network is 500 Mhz at 1300 nm Number of Stations The maximum number of devices in a single FDDI ring is 500 This limit is determined by the propagation delay from 1000 physical connections With the exception of optical bypass switches all FDDI devices are counted as two connections against the 1000 physical connection ...

Страница 146: ...C 16 BASIC FDDI NETWORKS DAS 2 DAC 2 SAC SAS SAS SAS SAS SAS 16 PHYSICAL CONNECTIONS 2 2 2 1 1 2 2 2 2 Figure C 11 Physical Device Connections ...

Страница 147: ...words 6 7 CLN 2 16 Collision 2 16 Collisions TX 5 11 Community Names Table screen 6 7 Concentrator Connection Status 9 2 Concentrator Ports Status 9 3 Configuration BPDU 5 3 5 10 MAC 3 5 MMAC 1 1 1 4 options 2 8 switch location 2 7 switch settings 2 8 confirmation message 5 18 CONSOLE port 3 1 port pin configuration 3 3 conventions 4 1 CRC Errors 5 10 Current Entries 8 3 D DAC 5 14 DAS 5 14 DEC 5 ...

Страница 148: ...ion 6 5 Filtered 5 10 Filtering Database screen 8 3 FLASH EEPROM 1 8 format conventions 4 1 forcing a download 6 13 Forwarded 5 10 FORWARDING 7 6 Frame Errors 5 3 Frames Filtered 5 2 Forwarded 5 2 Received 5 2 Transmitted 5 3 FW version 4 6 Firmware Version 4 6 H Hello Time 7 3 Hold Time 7 4 Hot Swapping 1 7 I IEEE 5 6 IEEE 802 1 5 6 IP Address 4 7 IRBM 2 4 IRM 2 4 IRM 2 2 4 IRM 3 2 4 Isolated 4 5...

Страница 149: ...3 7 7 POK 2 16 Port Name 6 3 OK 2 16 Priority 7 6 State 7 6 Power 2 17 PWR 2 17 R RCV 2 16 2 17 Rx Alignment 5 11 CRC 5 10 Errors 5 10 IP Frag Err 5 11 Overflow 5 11 Oversized 5 11 Read Write 6 8 Receive 2 16 2 17 Received 5 10 Overflow 5 11 Reset manual 3 6 RESTART BRIDGE command 6 6 Restarts 6 3 RESTORE DEFAULT SETTINGS command 6 6 Ring Down Tx 5 12 Ring Map screen 5 13 Ring Op 2 18 4 5 Ring Op ...

Страница 150: ...TFTP Download 6 9 Through A 5 3 Time Negotiated 5 5 Since Topology Change 7 3 Tneg 5 5 Tnotify 5 5 Topology Change 7 4 Change Acknowledge 7 7 Change Count 7 2 Total Messages 5 19 Trace 4 6 translation bridging 1 4 Transmissions Aborted 5 11 Transmit 2 14 2 16 Transmitted 5 10 Twisted Ring 2 17 twisted stations 5 14 TWR 2 17 Tx Abort 5 11 Collisions 5 11 Overflow 5 12 Ring Down 5 12 Type of Filteri...

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