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IBM OPTIONS ATM OC-3c User Manual

Manual is about: 8271 Nways Ethernet LAN Switch module

Summary of OPTIONS ATM OC-3c

  • Page 1

    8271 nways ethernet lan switch atm oc-3c module user’s guide.

  • Page 2

    B e fo re u si n g th is i n fo rm a ti o n a n d th e p ro d u ct i t su p p o rts, b e su re to r e a d t h e ge ner a l in fo rm a tio n u n d e r a p pe nd ix a ,“ s a fe ty i n fo r- m a ti o n ” an d a p pe nd ix f, “ n ot ic es , tr ade mar k s, an d w a rr a n tie s” . F irs t e d it io n (o...

  • Page 3: Ontents

    C ontents a bout t his g uide introduction 1 terminology 1 atm terminology 1 finding information in this guide 2 conventions 2 related documentation 3 1 f eatures and b enefits atm benefits 1-1 atm module features 1-2 2 n etwork l ayer c oncepts the layered network architecture 2-1 upper layer proto...

  • Page 4

    4 p utting y our atm n etwork t ogether planning your network 4-1 atm configuration rules 4-2 extending vlans through the atm network 4-2 atm connections within your network 4-3 5 n etwork c onfiguration e xamples atm backbone in the building 5-1 campus configuration 5-2 making a building resilient ...

  • Page 5

    A s afety i nformation safety notices a-1 world trade safety information a-1 b s creen a ccess r ights c atm m odule t echnical s pecifications environmental specifications c-1 atm cable specification c-1 does the cable provide sufficient bandwidth? C-2 d t roubleshooting how to use this guide to tr...

  • Page 7: Bout

    A bout t his g uide introduction this guide provides the information that you need to install and configure the ibm 8271 nways ethernet lan switch atm oc-3c module (agent software version 1.05) within an ibm 8271 nways ethernet lan switch which has version 3.1 agent software installed. This guide is...

  • Page 8

    2 a bout t his g uide finding information in this guide the following table shows you where to find specific information within this guide. Conventions table 1 and table 2 list conventions that are used throughout this guide. Task location learning concepts chapter 1, ‘features and benefits” chapter...

  • Page 9

    Related documentation 3 related documentation the atm oc-3c module documetation set includes: ■ ibm 8271 nways ethernet lan switch atm oc-3c module quick reference guide. Part number 02l1333 ■ ibm 8271 nways ethernet lan switch atm oc-3c module release notes. Part number 02l1334 words in italics ita...

  • Page 10

    4 a bout t his g uide.

  • Page 11: Eatures

    1 f eatures and b enefits this chapter describes the main features of the ibm 8271 nways ethernet lan switch atm oc-3c module and the benefits of atm within your network. The atm module provides a high-speed atm connection between your ibm 8271 nways ethernet lan switch and the atm network. Position...

  • Page 12

    1-2 c hapter 1: f eatures and b enefits atm module features the following list summarizes the atm module features. These features are described in more detail in this guide. ■ conforms to atm forum standards ■ oc-3c 155mbps interface ■ sonet (sts 3c) and sdh (stm-1) compliant ■ multi-mode fiber, sc ...

  • Page 13: Etwork

    2 n etwork l ayer c oncepts this guide contains several chapters that describe the basic concepts behind atm technology, and integrating atm into your existing network: ■ this chapter describes some of the concepts behind the network layer architecture of a typical atm network. ■ chapter 3, “virtual...

  • Page 14

    2-2 c hapter 2: n etwork l ayer c oncepts upper layer protocols the upper layer is the layer in the network architecture that relates to user applications and service requests. For example, an application could be file transfer software, and the service request could be a request to transfer a file ...

  • Page 15

    What is lan emulation (lane)? 2-3 lan emulation components each emulated lan (elan) is composed of a set of lan emulation components. This section describes each of these components. Lan emulation client (lec) each atm device has a number of lan emulation clients. Each lan emulation client (lec) is ...

  • Page 16

    2-4 c hapter 2: n etwork l ayer c oncepts lan emulation components in your network each emulated lan consists of a single lane service, and a number of lan emulation clients. A lane service consists of: ■ a lan emulation server (les) ■ a broadcast and unknown server (bus) ■ optional lan emulation co...

  • Page 17

    What is lan emulation (lane)? 2-5 joining the elan before a lan emulation client (lec) can transmit any ethernet frames onto the atm network it must first join an elan. To join the elan: 1 the lec must know the name of the elan it is to join. The elan name is specified through the management softwar...

  • Page 18

    2-6 c hapter 2: n etwork l ayer c oncepts mapping ethernet and atm addresses each device connected to an ethernet port has one or more mac addresses. Each atm device has a number of lan emulation clients, and each lan emulation client (lec) has an atm address. An example of this is shown in figure 2...

  • Page 19

    What is lan emulation (lane)? 2-7 lan emulation address resolution protocol (le_arp) an le_arp request is sent to the les to locate the destination mac address. The les in turn sends the le_arp request to all of the lecs in the emulated lan. Lecs represent (act as a proxy) for mac address devices co...

  • Page 20

    2-8 c hapter 2: n etwork l ayer c oncepts atm adaptation layer (aal) ethernet frames can be between 64 and 1514 bytes in length. Atm transmits data in fixed length cells. Each cell contains 48 bytes of user data. The atm adaptation layer (aal) converts data between the ethernet and atm formats. The ...

  • Page 21

    Asynchronous transfer mode (atm) layer 2-9 atm is service transparent atm allows for the high speed transfer of a wide range of user traffic, including voice, video and other data. The cell format means that more than one service (traffic type) can be multiplexed over the same physical line, see fig...

  • Page 22

    2-10 c hapter 2: n etwork l ayer c oncepts a vcc is defined as spanning end-to-end, whereas a virtual channel (vc) is the name given to a section of the vcc, refer to figure 2-6. Figure 2-6 connection terminology many virtual channels can exist on the same physical link. Each virtual channel is iden...

  • Page 23

    Asynchronous transfer mode (atm) layer 2-11 figure 2-7 switching cells using vpi and vci values..

  • Page 24

    2-12 c hapter 2: n etwork l ayer c oncepts switched virtual circuits (svcs) svcs use the signalling protocol to dynamically define connections as they are needed and to release them when they are no longer needed. Svcs use signalling for: ■ connections initiated by the user/application. ■ connection...

  • Page 25

    Asynchronous transfer mode (atm) layer 2-13 interim local management interface (ilmi) the atm forum produced the interim local management interface (ilmi) to increase monitoring and diagnostic facilities, and to provide atm address registration at the user-to-network interface (uni). Ilmi uses a man...

  • Page 26

    2-14 c hapter 2: n etwork l ayer c oncepts the atm layer and cell structure this section describes the cell structure, and how the atm layer uses the information stored in the cell header to perform each of its tasks. The atm layer’s primary responsibility is to manage the sending and receiving of c...

  • Page 27

    Physical layer 2-15 physical layer the physical layer is responsible for transmitting and receiving atm cells over a physical medium. It is also responsible for checking the integrity of the bits being transferred over a physical media, and for making sure that they are error-free. The atm module is...

  • Page 28

    2-16 c hapter 2: n etwork l ayer c oncepts.

  • Page 29: Irtual

    3 v irtual lan c oncepts this chapter provides a brief overview of virtual lan (vlan) concepts, and describes how to extend vlans into the atm network. This user guide does not describe how to create or configure vlans. Vlan configuration is described in the user guide that accompanies your switch. ...

  • Page 30

    3-2 c hapter 3: v irtual lan c oncepts extending vlans into the atm network you can use lan emulationto define and extend vlans seamlessly through the atm network, as shown in the example in figure 3-3. Traffic from one emulated lan (elan) is not seen on another elan as they are logically separate d...

  • Page 31

    Extending vlans into the atm network 3-3 figure 3-3 extending vlans into the atm network..

  • Page 32

    3-4 c hapter 3: v irtual lan c oncepts.

  • Page 33: Utting

    4 p utting y our atm n etwork t ogether this chapter takes you through the process of planning your network. Topics include: ■ planning and tracking your network configuration. ■ atm configuration rules. ■ extending virtual lans (vlans) into the atm network. ■ atm connection types. Planning your net...

  • Page 34

    4-2 c hapter 4: p utting y our atm n etwork t ogether ■ does your network meet safety specifications? You should always follow safety requirements and ensure that your device environment meets all technical specifications. For the atm module these requirements are specified in appendix a. For other ...

  • Page 35

    Atm connections within your network 4-3 ■ virtual circuits required. ■ mac addresses that can be held in the device lan emulation arp table. When a lan emulation client (lec) joins an elan, up to five control connections may be required before any data is transferred over a separate data connection ...

  • Page 36

    4-4 c hapter 4: p utting y our atm n etwork t ogether figure 4-1 shows an example of a network configuration where a remote edge-device does not support lan emulation based on svcs (it only supports pvc lan emulation). Figure 4-1 svc signalling not supported in remote edge-device.

  • Page 37: Etwork

    5 n etwork c onfiguration e xamples this chapter provides examples of possible network configurations using the atm module. If you are unfamiliar with atm, you should read this chapter in conjunction with chapter 4, “putting your atm network together”. Atm backbone in the building this section gives...

  • Page 38

    5-2 c hapter 5: n etwork c onfiguration e xamples campus configuration the section gives an example of atm within a campus environment. The diagram shown in figure 5-2 on page 5-3 demonstrates a balance between cost and performance requirements. Building a shows how you can concentrate ibm 8721 nway...

  • Page 39

    Campus configuration 5-3 figure 5-2 campus and cost sensitive network.

  • Page 40

    5-4 c hapter 5: n etwork c onfiguration e xamples making a building resilient to network failure you can build resilience into your building backbone as shown in figure 5-3. The provision of resilient links protects your network against cable and network failure by using a main and a standby link. S...

  • Page 41: Nstalling

    6 i nstalling and s etting u p the m odule following safety information attention: only hold the atm module by the edges to avoid damage from static. Do not touch the top or bottom of the circuit board. Danger: before installing or removing anycomponents of a device, or carrying out anymaintenance w...

  • Page 42

    6-2 c hapter 6: i nstalling and s etting u p the m odule qualquer trabalho de manutenção, deve ler o conteúdo do apêndice a, “informações sobre segurança”, deste manual. Peligro: antes de instalar o extraer cualquiercomponente de un dispositivo, o realizar cualquier trabajo de mantenimiento, debe le...

  • Page 43

    Device support 6-3 device support the atm module allows you to connect your ibm 8271 nways ethernet lan switch to an atm network. Switches that support the atm module are listed in the “release notes” that accompany your atm module. Pre-installation procedure this section describes the procedures yo...

  • Page 44

    6-4 c hapter 6: i nstalling and s etting u p the m odule installation this section describes how to install the atm module using the example of an ibm 8271 nways ethernet lan switch model 624 device. Installation is similar for all devices compatible with this atm module. 1 if the switch is connecte...

  • Page 45

    Post-installation checks 6-5 connecting a cable to the atm port 1 ensure that the cable you wish to connect to the port meets the correct specification. For cable specifications, refer to “atm cable specification” on page c-1. 2 each end of the fiber cable has a transmit (tx) and receive (rx) connec...

  • Page 46

    6-6 c hapter 6: i nstalling and s etting u p the m odule led summary this section describes the leds that provide status and troubleshooting information. Table 6-1 lists the switch leds, and table 6-2 lists atm module leds. Table 6-1 leds on the switch led name color/state indicates mgmt (on the fro...

  • Page 47

    Post-installation checks 6-7 checking the power supply check the mgmt led on the switch. If the mgmt led is not lit there is a power supply problem. Try the following troubleshooting procedures: 1 check that the power supply is plugged into the device, using a power outlet that is known to be workin...

  • Page 48

    6-8 c hapter 6: i nstalling and s etting u p the m odule 4 remove any objects obstructing the cable and straighten out any kinks in the cable. 5 if you suspect that the fiber optic connector is dirty, refer to “cleaning dirty fiber optic connectors” on page d-24. 6 check that your cable meets the sp...

  • Page 49: Ccessing

    7 a ccessing m anagement f eatures the menu-driven user interface built into the device is known as the vt100 or local management interface. The vt100 management interface has a forms-based structure with pre-defined security levels, enabling access to be restricted to particular users. Accessing an...

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    7-2 c hapter 7: a ccessing m anagement f eatures figure 7-1 screen map.

  • Page 51

    Logging on 7-3 logging on 1 connect your terminal to the console port using a cross-over cable for a serial line connection. 2 at your terminal, press [return] two or more times until the main banner is displayed, as shown in figure 7-2. Figure 7-2 main banner the console port will automatically det...

  • Page 52

    7-4 c hapter 7: a ccessing m anagement f eatures to find out which atm screens can be accessed for each of the security levels, refer to appendix b, “screen access rights”. For access rights to switch screens, see the user guide that accompanies your switch. When you have logged on, the main menu sc...

  • Page 53: Anaging

    8 m anaging the atm m odule this chapter describes how to manage the atm module. If you wish to view statistics, refer to chapter 9, “monitoring the atm module”. Figure 8-1 shows the screen map. Management features are shown in gray to help you locate the screen you need. Figure 8-1 management scree...

  • Page 54

    8-2 c hapter 8: m anaging the atm m odule configuring an atm port the atm module configuration screen shows the settings and standards used by the atm module to communicate with other devices on the atm network. It is unlikely that you will need to change the value of these settings once they have b...

  • Page 55

    Configuring an atm port 8-3 sonet/sdh specifies the framing used. Select either sonet sts-3c or sdh stm-1. The default is sonet sts-3c. The max vpi bits and max vci bits fields described below, are used to determine how many bits can be used within each cell header to define the value of the vpi and...

  • Page 56

    8-4 c hapter 8: m anaging the atm m odule upgradable software version shows the version number of agent software stored on the atm module (in flash eprom). Boot software version this is the version number of the boot software stored on the atm module. You should keep a copy of these version numbers,...

  • Page 57

    Extending vlans into the atm network 8-5 2 if the vlan is to be connected to an elan, select yes. If you do not wish the vlan to be connected to an elan, select no. 3 if there is a lecs controlling elans on your network, it should automatically supply the les address for the elan, and you should sel...

  • Page 58

    8-6 c hapter 8: m anaging the atm m odule figure 8-5 vlan selected screen figure 8-6 switch vlan setup screen use [ctrl]+[d] keys to scroll down the list box to view the rest of the list, including the atm port. The atm port is shown as atm in the type field, or as atm bp if it has been set up as a ...

  • Page 59

    Atm port setup 8-7 figure 8-7 atm port setup screen the screen shows the following fields: port identifies the selected port. Port speed shows the speed of the port connection. Port state allows you to turn the port on and off. If you wish to allow traffic to pass through this port, select the enabl...

  • Page 60

    8-8 c hapter 8: m anaging the atm m odule lost links the number of times a link was unable to transmit traffic, that is, the number of times (since the device was reset) that the link state became not available. Lec states shows the status of the lec for each vlan. The state can be: lec active — tra...

  • Page 61

    Mapping far end mac addresses 8-9 vlan allows you to select a vlan, and display address information about remote systems connected to that vlan. Port identifies the selected port. Far mac address shows the mac address on the edge-device at the far end of the connection. Far atm address shows the atm...

  • Page 62

    8-10 c hapter 8: m anaging the atm m odule finding an address entry 1 in the far mac address field, type in the mac address associated with the atm address you are trying to locate. 2 select the find atm address button. An asterisk (*) is shown next to the entry in the database listbox. Updating add...

  • Page 63

    Setting up resilient links 8-11 atm address shows the atm address of lec for either the atm module or the atm switch. If near is shown in the end field, the address is the address of the lec in the atm module. If far is shown in the end field, it is the address of the lec in the atm switch or attach...

  • Page 64

    8-12 c hapter 8: m anaging the atm m odule every 2 minutes the switch checks the resilient links to ensure that the fastest link is the main (active) link in the resilient link pair. If the fastest link is not the main (active) link, the switch automatically makes it the main (active) link, on the c...

  • Page 65

    Upgrading software 8-13 when the ok button is selected, the status of the upgrade is displayed. The following error and status messages are available: error messages this section lists error messages that may appear if an error occurs while downloading a new software image, and suggests solutions to...

  • Page 66

    8-14 c hapter 8: m anaging the atm m odule status messages this section lists status messages that can appear when you download new software images to a device. Active the file is currently being downloaded to the selected device. Allow time for the download to complete. Download successful the file...

  • Page 67: Onitoring

    9 m onitoring the atm m odule this chapter describes how to monitor the status and performance of your atm module. Figure 9-1 shows the screen map. Monitoring screens are shaded gray to help you locate the screens you need. Figure 9-1 status monitoring screen map.

  • Page 68

    9-2 c hapter 9: m onitoring the atm m odule statistics overview this section provides a brief overview of the additional statistics that are available when you install an atm module. Refer to the user guide that accompanies the switch for information about the statistics that are provided by the swi...

  • Page 69

    Atm port statistics 9-3 atm port statistics the atm port statistics screen provides a top level summary of traffic levels on the atm port. You can use the summary to estimate the amount of traffic on your network backbone, and to check the health of the incoming connection. Statistics are grouped in...

  • Page 70

    9-4 c hapter 9: m onitoring the atm m odule receive errors shows the percentage of cells received that have errors. For example, cells received with corrupted header information (header error control – hec). Receive errors indicate that there is something wrong with the link, and you should check fo...

  • Page 71

    Atm vlan lec status 9-5 the screen also shows the following atm statistics: cells received the number of atm cells received by the port. Cells transmitted the number of atm cells transmitted per second by the port. Errored cells the number of atm cells that contain an error, for example, cells that ...

  • Page 72

    9-6 c hapter 9: m onitoring the atm m odule port id identifies the currently selected port. Vlan allows you to select the vlan you wish to monitor. The default is vlan 1. If you wish to review the state of all vlans on the atm module, see “atm port setup” on page 8-6. Lec state shows the state of th...

  • Page 73

    Atm vlan lec status 9-7 invalid request parameters the les/lecs has rejected a request from the lec because the request parameters were incompatible with the elan. The lec may be requesting a resource that is on an elan which has a different lan type to the lec. The frame size used could be wrong. C...

  • Page 74

    9-8 c hapter 9: m onitoring the atm m odule insufficient resources there are insufficient resources to grant a request. Too many connections have been requested and the tables used by the les may be full, and the connection cannot be set up. The atm switch is busy and cannot provide lecs functionali...

  • Page 75

    Atm vlan lec status 9-9 lec operation at failure identifies the operation that was being carried out when the lec setup failed. This field should be used in conjunction with the last lec failure reason to identify the cause of the problem. The possible operations are shown in table 9-4. Le_configure...

  • Page 76

    9-10 c hapter 9: m onitoring the atm m odule frames received the number of ethernet frames received by the lec. Frames transmitted the number of ethernet frames transmitted by the lec. Octets received the number of ethernet octets received by the lec. Octets transmitted the number of ethernet octets...

  • Page 77

    Atm physical layer statistics 9-11 figure 9-5 physical layer statistics current sample specifies the number of seconds elapsed within the current sampling period. Sonet/sdh counters are accumulated over a period of 15 minutes (900 seconds). At the end of the 15 minute sampling period, the software s...

  • Page 78

    9-12 c hapter 9: m onitoring the atm m odule the following statistics are available: errored seconds (near) the number of errored seconds at the atm module end of the connection. Errored seconds (far) the number of seconds at the atm switch end of the connection. Severe errored sec (near) the number...

  • Page 79

    Atm physical layer statistics 9-13 7 if you suspect that the fiber optic cable is not working, replace the cable with a cable known to be working, and check the link status led. 8 check that the cable has not been accidently plugged into an fddi connector at one end of the connection. 9 check that t...

  • Page 80

    9-14 c hapter 9: m onitoring the atm m odule.

  • Page 81: Afety

    A s afety i nformation you must read the following safety information before carrying out any installation or removal of components, or any maintenance procedures on the switch. Safety notices safety notices are printed throughout this manual. Dangernotices warn you of conditions or proce- dures tha...

  • Page 82

    A-2 a ppendix a: s afety i nformation gevarr: voordat u begint met het installeren van dit produkt, dient u eerst de veiligheidsrichtlijnen te lezen die zijn vermeld in de publikatie caution: safety informtion – read this first, sd21-0030. In dit boekje vindt u veilige procedures voor het aansluiten...

  • Page 83

    Safety notices a-3 vigyázat: mielôtt megkezdi a berendezés üzembe helyezését, olvassa el a caution: safety information – read this first, sd21-0030 könyvecskében leírt biztonsági információkat. Ez a könyv leírja, milyen biztonsági intézkedéseket kell megtenni az elektro- mos berendezés huzalozásakor...

  • Page 84

    A-4 a ppendix a: s afety i nformation attention danger: installation and removal of the unit must be carried out by qualified personnel only. Danger: l'installation et l'enlèvement de l'unité doivent être faits seulement par le personnel quali- fié. Danger: ein- und ausbau des gerätes ist nur von fa...

  • Page 85

    Safety notices a-5 danger: this unit operates under selv conditions (safety extra low voltage) according to iec 950, the conditions of which are maintained only if the equipment to which it is connected is also opera- tional under selv. Danger: cette unité marche sous les conditions selv (safety ext...

  • Page 86

    A-6 a ppendix a: s afety i nformation gervaar: deze eenheid werkt onder extra lage spanning (selv, safety extra low voltage) volgens norm iec 950. Er wordt uitsluitend aan deze norm voldaan zolang de apparatuur waarmee de eenheid is verbonden, ook werkt onder selv. Vaara: tämä yksikkö sisältää kansa...

  • Page 87

    Safety notices a-7 Это устройство работает по стандарту iec 950 в условиях Безопасно низкого напряжения (selv) только при условии, что все оборудование в цепи отвечает стандартам selv..

  • Page 88

    A-8 a ppendix a: s afety i nformation.

  • Page 89: Creen

    B s creen a ccess r ights this appendix lists the security access level you must have to be able to access the atm module local management screens, and lists the type of action that can be performed for each security level. This appendix only covers screens specifically associated with atm functiona...

  • Page 90

    B-2 a ppendix b: s creen a ccess r ights.

  • Page 91: Atm M

    C atm m odule t echnical s pecifications environmental specifications the environmental specifications for the atm module are shown in table c-1. Atm cable specification in addition to adhering to your local standards, all cables must conform to: the american national standard atm physical layer med...

  • Page 92

    C-2 a ppendix c: atm m odule t echnical s pecifications maximum attenuation includes attenuation and the loss induced by other components such as connectors, splices, and the mating of unlike fiber types. Although some 2km (1.25 miles) cables have a total attenuation of less than 11db, the 2km (1.25...

  • Page 93

    Atm cable specification c-3 to check that the bandwidth of your fiber is within an acceptable range: 1 divide the amount of bandwidth available according to the fiber specification by the total length of fiber (km). 2 if the result is lower than 250mhz, the link may be prone to bit errors. You shoul...

  • Page 94

    C-4 a ppendix c: atm m odule t echnical s pecifications.

  • Page 95: Roubleshooting

    D t roubleshooting how to use this guide to troubleshoot this troubleshooting section describes how to identify the cause of a problem and suggests possible solutions. Troubleshooting has been divided into four sections. ■ using leds leds on the switch and atm module provide valuable status informat...

  • Page 96

    D-2 a ppendix d: t roubleshooting using leds table d-1 describes the leds on the switch, and table d-2 describes the leds on the atm module. Table d-1 leds on the switch led name color/state indicates mgmt (on the front of the switch) green green flashing yellow yellow flashing off switch and atm mo...

  • Page 97

    Identifying the problem d-3 identifying the problem this section describes how to identify problems, and suggests possible solutions. Flow diagrams have been used to summarize the process, and each step shown in the flow diagrams is described in more detail in the text. This section assumes that the...

  • Page 98

    D-4 a ppendix d: t roubleshooting figure d-1 troubleshooting flow diagram.

  • Page 99

    Identifying the problem d-5 the numbered steps in this section relate to the numbered steps shown in figure d-1. Access the physical layer statistics screen a select the switch management option from the main menu. The switch management screen is displayed. B ensure that the port option is selected ...

  • Page 100

    D-6 a ppendix d: t roubleshooting check the physical connections check that the link status and far end status leds on the atm module are on and lit green. If one or both of the leds is not lit, there is a problem with the physical connection. Follow the troubleshooting information below: a ensure t...

  • Page 101

    Identifying the problem d-7 is the atm port enabled? Is the port state field set to enable? Yes — go to step 7. No — go to step 6. Enable the atm port a set the port state field to enable. B select the ok button. Access the atm port statistics screen a select the switch management option from the ma...

  • Page 102

    D-8 a ppendix d: t roubleshooting access the atm vlan lec status screen a from the main menu select the switch management option. The switch management screen is displayed. B ensure that the port option is selected in the management level field. C ensure that the atm port number is entered in the po...

  • Page 103

    Identifying the problem d-9 both devices must be aal5 compliant the atm module is compatible with aal5 atm devices. If the atm switch connected to the atm module does not support aal5, you will not be able to get the two devices to communicate. Re-configure your network to ensure that the atm device...

  • Page 104

    D-10 a ppendix d: t roubleshooting is the ilmi connection set up correctly? To communicate with each other, edge-devices must use the same interim local management interface (ilmi) connection. On the atm module the ilmi connection is specified in the ilmi vcc field, as shown in figure d-6 on page d-...

  • Page 105

    Identifying the problem d-11 why has the lec operation failed? There are two fields on the atm vlan lec status screen, described in step 9, that can be used to troubleshoot lec failure problems. The lec operation at failure field identifies the operation that was taking place when the lec failed to ...

  • Page 106

    D-12 a ppendix d: t roubleshooting table d-4 last lec failure reason state possible causes possible solutions none the lec is either inactive or has successfully completed the operation. None required. Timeout a task could not be completed within its allotted time frame. The software has been set up...

  • Page 107

    Identifying the problem d-13 duplicated atm address a source atm address duplicates a previously registered atm address. The les has received a request from a lec which contains an atm address already registered to another lec on the same elan. For example, if a les is faulty, when a lec disconnects...

  • Page 108

    D-14 a ppendix d: t roubleshooting is the lec operational now? Yes — go to step 25. No — contact technical support. Refer to appendix e. Invalid requestor id the lec identifier (lecid) is not zero, or is not recognized as this lec’s lecid. There is a problem with the lec software. Contact technical ...

  • Page 109

    Identifying the problem d-15 has the problem been solved? Yes — no further action is required. No — there may be a configuration problem with your network, see “elan configuration problems”. Elan configuration problems figure d-7 shows a flow diagram to help you resolve problems associated with emul...

  • Page 110

    D-16 a ppendix d: t roubleshooting an example of the atm lec setup screen is shown in figure d-8. B select the vlan associated with the lec that you wish to move. C either enter the atm address of the les that the lec is going to join, or select lecs. D in the elan name field, enter the name of the ...

  • Page 111

    Solving known problems d-17 solving known problems use this section if you have already pin-pointed the problem, and wish to look up possible solutions. Solutions are presented as a series of tables, and each table relates to a logical problem area: ■ power supply problems ■ power on self test (post...

  • Page 112

    D-18 a ppendix d: t roubleshooting power supply problems table d-5 power supply problems problem possible causes possible solutions switch does not power up ■ insufficient power supply to the switch ■ system is not receiving power ■ power supply malfunction ■ blown fuse ■ if the switch does not powe...

  • Page 113

    Solving known problems d-19 power on self test (post) failure table d-6 power on self test (post) failure problem possible causes possible solutions switch fails power on self test (post) mgmt led is yellow ■ the version of software on your switch is not correct. ■ there is a hardware problem with t...

  • Page 114

    D-20 a ppendix d: t roubleshooting cable connection problems table d-7 cable connection problems problem possible causes possible solutions link status led indicates that there is a problem with a link. Far end status led indicates that there is a problem with the atm module’s transmit connection. ■...

  • Page 115

    Solving known problems d-21 atm problems table d-8 atm problems problem possible causes possible solutions the atm connection table is only showing reserved atm connections symptoms: ■ the vlan lec status screen, described in “atm vlan lec status” on page 9-5, shows that the lec is inactive and ther...

  • Page 116

    D-22 a ppendix d: t roubleshooting vlan or elan problems table d-9 vlan or elan problems problem possible causes possible solutions the configured lecs cannot communicate with each other possible symptom: the last lec failure reasons, described in table d-4 on page d-12,is le_configure or similar er...

  • Page 117

    Solving known problems d-23 if you have problems that are not addressed by troubleshooting information in this guide, contact technical support, or your service person. For technical support information refer to appendix e. Intermittent failure of a configured lec to connect to the lecs or les sympt...

  • Page 118

    D-24 a ppendix d: t roubleshooting cleaning dirty fiber optic connectors to prevent dirt and dust from collecting on the fiber optic connectors, avoid touching all surfaces after cleaning the connectors, and keep all unused ports covered. Fiber optic transceivers are sensitive optical devices that n...

  • Page 119: Echnical

    E t echnical s upport and s ervice this appendix provides contacts for help if you have questions about the ibm 8271 nways ethernet lan switch products or if the ibm 8271 nways ethernet lan switch products are not working correctly. It also explains how to access the ibm electronic sites to obtain t...

  • Page 120

    E-2 a ppendix e: t echnical s upport and s ervice.

  • Page 121: Otices

    F n otices , t rademarks , and w arranties references in this publication to ibm products, pro- grams, or services do not imply that ibm intends to make these available in all countries in which ibm operates. Any reference to an ibm product, pro- gram, or service is not intended to state or imply th...

  • Page 122

    F-2 a ppendix f: n otices , t rademarks , and w arranties statement of limited warranty the warranties provided by ibm in this state- ment of limited warranty apply only to machines you originally purchase for your use, and not for resale, from ibm or your reseller. The term "machine" means an ibm m...

  • Page 123

    Statement of limited warranty f-3 ibm or your reseller is unable to repair or replace the machine, you may return it to your place of pur- chase and your money will be refunded. If you transfer a machine to another user, warranty service is available to that user for the remainder of the warranty pe...

  • Page 124

    F-4 a ppendix f: n otices , t rademarks , and w arranties these warranties replace all other warran- ties or conditions, express or implied, including, but not limited to, the implied warranties or conditions of merchantabil- ity and fitness for a particular purpose. These warranties give you specif...

  • Page 125

    Electronic emission notices f-5 electronic emission notices federal communications commission (fcc) statement this equipment has been tested and found to comply with the limits for a class a digital device, pursuant to part 15 of the fcc rules. These limits are designed to provide reasonable protect...

  • Page 126

    F-6 a ppendix f: n otices , t rademarks , and w arranties european union (eu) statement this product is in conformity with the protection requirements of eu council directive 89/336.Eec on the approximation of the laws of the member states relating to electromagnetic compatibility. Ibm cannot accept...

  • Page 127

    Electronic emission notices f-7 japanese voluntary control council for interference (vcci) statement class b this is a class b product based on the standard of the voluntary control council for interference from information technology equipment (vcci). If this equipment is used near a radio or telev...

  • Page 128

    F-8 a ppendix f: n otices , t rademarks , and w arranties if necessary, the user should consult the dealer or an experienced radio/television technician for addi- tional suggestions. The user may find the following booklet prepared by the federal communications commission helpful: how to identify an...

  • Page 129: Lossary

    G lossary aal atm adaptation layer — a set of protocols that translate user higher-layer protocols into atm cell format. The aal is divided into the convergence sublayer (cs) and the segmentation and reassembly (sar) sublayer. Ansi american national standards institute. A united states technology st...

  • Page 130

    2 g lossary byte an octet or 8 bits of data. Cell basic atm transmission unit. It is a 53-byte packet, consisting of a 5-byte header and a 48-byte payload. User traffic is segmented into cells at the source and reassembled at the destination. Cell header the 5-byte atm cell header contains control i...

  • Page 131

    G lossary 3 gfc generic flow control — a 4-bit field in the atm cell header in order to support multiplexing functions. Its default value is ‘0000’, when the gfc protocol is not enforced. The gfc mechanism is intended to support simple flow control in atm connections. Hec header error control or hea...

  • Page 132

    4 g lossary multiplex in this user guide, multiplexing means to take packets from several sources and interleave them into one connection. For example, packets from data, voice, and video sources can be fed down one connection. Nni network node interface — sometimes known as network-to-network inter...

  • Page 133

    G lossary 5 sonet synchronous optical network — an ansi-defined standard for high speed and high quality digital optical transmission. It has been recognized as the north american standard for sdh. Svc switched virtual circuit — a connection where control signalling is used to dynamically establish ...

  • Page 134

    6 g lossary vci virtual channel identifier — a 16-bit value in the atm cell header that provides a unique identifier for the virtual channel (vc) that carries that particular cell. Virtual channel see vc. Vlan virtual local area network — a group of location and topology independent devices that com...

  • Page 135: Ibliography

    B ibliography asynchronous transfer mode (atm) books “atm foundation for broadband networks” author: uyless black. Published by: prentice hall isbn: 0-13-297178-x standards atm forum —- integrated local management interface (ilmi) specification (version 3.1 or later). Atm forum — atm user-network in...

  • Page 136

    2 b ibliography.

  • Page 137: Ndex

    I ndex a address resolution 2-6, 2-13 arp table 8-8 creating an entry 8-9 deleting entries 8-10 entry type 8-9 locating an entry 8-10 updating entries 8-10 asynchronous transfer mode 2-8 atm address resolution 2-6, 2-13 atm layer 2-14 benefits 1-1 configuration examples 5-1 building backbone 5-1 cam...

  • Page 138

    2 i ndex e electronic emmission notices f-5 emulated lan (elan) atm module 4-3 elan name 8-5, 9-6 manual configuration 8-5 mapping to vlans 3-2, 4-2 resource planning 4-2 services 4-2 environmental specifications c-1 error detection header error check (hec) 2-14 error messages software upgrade 8-13 ...

  • Page 139

    I ndex 3 port configuration 8-2 setup 8-6 speed 8-7 state 8-7 statistics 9-3 power supply 6-3, 6-7 pti 2-14 r resilient links 8-11 configuration example 5-4 routing 2-4, d-15 rules for atm configuration 4-2 s safety information 6-1 screen access rights b-1 sdh 2-15 configuring 8-3 statistics 9-10 se...

  • Page 140

    4 i ndex.