Instruction/ maintenance manual of the product 9H42X-XX Cabletron Systems
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MMA C-Plus ™ Remote Mana gement f or the 9H42x-xx Series F ast Ethernet Smar tSwitch ™ Modules Title Page Cabletr on Systems.
i Notice Cabletron Systems r eserves the right to make changes in specifications and other information contained in this document without prior notice. The reader should in all cases consult Cabletr on Systems to determine whether any such changes have been made.
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v Contents Chapter 1 Intr oduction Using the 9H42x-xx User ’s Guide .............................................................................. 1-3 Related Manuals ..................................................................................
Contents vi Creating and Editing a Basic Alarm .................................................................... 3-6 Disabling a Basic Alarm ........................................................................................ 3-9 V iewing the Basic Alarm Log .
vii Contents Filtering Database ....................................................................................................... 5-19 Configuring the Filtering Database ................................................................... 5-22 Altering the Ageing T ime .
Contents viii.
1-1 Chapter 1 Intr oduction How to use this guide; related guides; software con ventions; getting help; 9H42x-xx fir mware v ersions W elcome to the Cabletron Systems MMAC-Plus Remote Management for the 9H42x-xx Series Fast Ethernet SmartSwitch™ Modules User ’ s Guide.
Introduction 1-2 Each front-panel port (r egardless of media type or bandwidth capability) can be configured to operate in Full Duplex Switched Ethernet (FDSE) mode.
Using the 9H42x-xx User’ s Guide 1-3 Introduction Using the 9H42x-xx User’ s Guide Remote management for the 9H42x-xx family of modules is available from two main resour ces: the MMAC-Plus Chassis.
Introduction 1-4 Related Manuals Related Manuals The MMAC-Plus Remote Management for the 9H42x-xx Series Fast Ethernet SmartSwitch Modules User ’ s Guide is only part of a complete document set designed to provide compr ehensive information about the features available to you through SPECTRUM Element Manager .
Software Con ventions 1-5 Introduction Figure 1-1. Sample W indow Showing Informational T ext Boxes Device Name Displays the user-defined name of the device. The device name can be changed via the System Group window; see the Generic SNMP Management Module Guide for details.
Introduction 1-6 Getting Help Using Buttons The button that appears at the bottom of most windows allows you to exit a window and terminate any unsaved changes you have made. Y ou may also have to use this button to close a window after you have made any necessary changes and set them by clicking on an , , or button.
9H42x-xx Firmware 1-7 Introduction Getting Help fr om Cabletr on Systems’ Global Call Center If you need support related to SPECTRUM Element Manager , or if you have any questions, comments, or sugg.
Introduction 1-8 9H42x-xx Firmware.
2-1 Chapter 2 The 9H42x-xx Module Vie w Accessing the Module View; inf or mation display ed in the Module View window; the Chassis Manager window; module management functions; por t configuration The.
The 9H42x-xx Module View 2-2 Viewing Module Inf or mation from the MMA C-Plus Chassis View: 1. Click the left mouse b utton on the index n umber f or the slot which contains the 9H42x-xx module you wish to manage . 2. On the resulting menu, clic k to select Device Vie w .
Viewing Module Inf or mation 2-3 The 9H42x-xx Module View By clicking in designated areas of the module’s graphical display (as detailed later in this chapter), or by using the menu bar at the top of the Module V iew window , you can access all of the menus that lead to more detailed device- and port- level windows.
The 9H42x-xx Module View 2-4 Viewing Module Inf or mation MA C The physical layer address assigned to the interface thr ough which SPECTRUM Element Manager is communicating with the 9H42x-xx Module.
Viewing Module Inf or mation 2-5 The 9H42x-xx Module View Figure 2-2. 9H42x-xx Module V iew Menu Structur e The Device Menu From the Device Menu at the Module V iew window menu bar , you can access the following selections: • Device T ype... , which displays a window containing a description of the device being modeled.
The 9H42x-xx Module View 2-6 Viewing Module Inf or mation • Power Supply , Chassis Power Detail , and Environment V iew provide access to windows which provide information about the MMAC-Plus chassis the selected module is installed in.
Viewing Module Inf or mation 2-7 The 9H42x-xx Module View Refer to your SPECTRUM Element Manager T ools Guide for information on the MIB T ools utility , and to the SPECTRUM Element Manager Remote Monitoring (RMON) User ’ s Guide for more information on the RMON tool.
The 9H42x-xx Module View 2-8 Viewing Module Inf or mation The P or t Menu The menu for the INB and Ethernet interfaces offers the following selections: • Performance Graph... , which brings up a bridging statistics window specific to the selected interface.
Viewing Module Inf or mation 2-9 The 9H42x-xx Module View Selecting a P or t Status View T o change the status view of your ports: 1. Click on Por t Status on the men u bar at the top of the Module Vie w window; a menu will appear . 2. Drag do wn (and to the right, if necessar y) to select the status inf ormation you want to displa y .
The 9H42x-xx Module View 2-10 Viewing Module Inf or mation If you have selected the Admin status mode, a port is considered: • ON if the port is enabled by management.
Viewing Module Inf or mation 2-11 The 9H42x-xx Module View I/F Speed If you choose the I/F Speed mode, the interface boxes will display the bandwidth of each individual interface on the 9H42x-xx module: 10M (megabits) for standard Ethernet; 100M for Fast Ethernet; and 2500M for the INB backplane interface.
The 9H42x-xx Module View 2-12 Viewing Module Inf or mation Figure 2-3. Chassis Manager W indow T o view the Chassis Manager window: 1. Click on Help on the men u bar at the top of the Module View windo w . 2. Click again to select MIBs Supported , and release.
Viewing Module Inf or mation 2-13 The 9H42x-xx Module View Viewing I/F Summary Inf ormation The I/F Summary menu option available from the Device menu lets you view statistics (displayed both graphically and numerically) for the traffic pr ocessed by each network interface on your device.
The 9H42x-xx Module View 2-14 Viewing Module Inf or mation Host interfaces and the backplane INB interface), and ethernet-csmacd (for both standard and Fast Ethernet fr ont panel interfaces, and the backplane SMB 10 management interface).
Viewing Module Inf or mation 2-15 The 9H42x-xx Module View In Packets Packets (both unicast and non-unicast) received by the device interface and delivered to a higher -layer protocol. In Errors Packets received by the device interface that contained errors that pr evented them from being delivered to a higher-layer pr otocol.
The 9H42x-xx Module View 2-16 Viewing Module Inf or mation Viewing Interface Detail The Interface Statistics window ( Figure 2-6 ) pr ovides detailed MIB-II interface statistical information — including counts for both transmit and receive packets, and error and buf fering information — for each individual port interface.
Viewing Module Inf or mation 2-17 The 9H42x-xx Module View T ype Displays the interface type of the selected port: ethernet-csmacd, sdlc, or other . The lower portion of the window provides the following transmit and r eceive statistics; note that the first four statistics are also graphically displayed in the pie charts.
The 9H42x-xx Module View 2-18 Viewing Module Inf or mation P ackets T ransmitted (T ransmit only) Displays the number of packets transmitted by this interface.
Managing the Module 2-19 The 9H42x-xx Module View Figure 2-7. Find Source Address W indow 3. In the te xt field, enter a v alid MA C address in he xadecimal f or mat, then click .
The 9H42x-xx Module View 2-20 Managing the Module Configuring Standard Ethernet P orts The Port Configuration window available for standard Ethernet ports allows you to set an interface to either Standard or Full Duplex Mode.
Managing the Module 2-21 The 9H42x-xx Module View Be sure to click on to set your changes; note that the interface’s current mode can be determined by the field selected in the window . Configuring Fast Ethernet P orts For any Fast Ethernet interface, the Port Configuration window allows you to both view and set that port’s available modes.
The 9H42x-xx Module View 2-22 Managing the Module From this window you can manually set the operational mode of the port, or — for 100Base-TX interfaces — set the port to auto negotiation so that the appropriate operational mode can be determined automatically .
Managing the Module 2-23 The 9H42x-xx Module View Note that if Auto Negotiation is the selected mode, the Current Operational Mode field will indicate which mode was selected by the link partners. See Setting the Desired Operational Mode , page 2-24 , for more information.
The 9H42x-xx Module View 2-24 Managing the Module • Link Partner does not support auto negotiation — auto negotiation is either not supported by or is not currently selected on the r emote port. • Unknown — the link partner ’s capabilities could not be determined.
Managing the Module 2-25 The 9H42x-xx Module View F or 100Base-FX por ts, options are: 100Base-FX — 100 Mbps connection, Standard Mode 100Base-FX Full Duplex — 100 Mbps connection, Duple x Mode 2.
The 9H42x-xx Module View 2-26 Managing the Module 2. Enter the new time in a 24-hour hh:mm:ss f or mat, either by highlighting the field you wish to change and using the up and do wn arrow buttons , or by simply entering the new v alue in the appropriate field.
Managing the Module 2-27 The 9H42x-xx Module View T o enable or disable bridging for an individual interface: 1. Click on the appropriate por t display bo x to displa y the por t menu. 2. Drag down to select Enable to enab le bridging at the interface , or Disable to disable bridging.
The 9H42x-xx Module View 2-28 Managing the Module.
3-1 Chapter 3 Alarm Configuration Accessing the Basic and Adv anced Alar ms windows; creating a basic alarm; creating an advanced alarm; creating e vents; assigning actions to ev ents; viewing the e .
Alar m Configuration 3-2 Basic Alarm Configuration Using the Advanced Alarms feature, you can define custom alarms for almost any MIB-II or RMON object, as long as it is present in the device firmwar e and its value is defined as an integer (including counters, timeticks, and gauges).
Basic Alar m Configuration 3-3 Alar m Configuration Accessing the Basic Alarm Configuration Window T o access the RMON Basic Alarm Configuration window: 1. F rom the Module View , clic k on the appropriate por t interf ace to display the P or t menu.
Alar m Configuration 3-4 Basic Alarm Configuration Viewing Alarm Status The Basic Alarm Configuration window contains all the fields you need to configure one or mor e of the three basic alarms a.
Basic Alar m Configuration 3-5 Alar m Configuration Status Displays the current status of the selected alarm type for each interface: Enabled or Disabled. Remember , this status refers only to the alarm type which is selected at the top of the window; each of the other two alarm types can have differ ent states.
Alar m Configuration 3-6 Basic Alarm Configuration The remainder of the window fields pr ovide the means for configuring alarms for each available interface. Note that the information provided in this scr een is static once it is displayed; for updated information, click on .
Basic Alar m Configuration 3-7 Alar m Configuration 5. Any v alue you enter in the Comm unity field will be included in any trap messages issued by y our 9H42x-xx in response to the alar m(s) you are configuring; this value is also used to direct traps related to this alarm to the appropriate management workstation(s): a.
Alar m Configuration 3-8 Basic Alarm Configuration 7. In the Rising Action field, click to select the action y ou want your de vice to take in response to a rising alarm: Enable P ort, Disable P or t, or None. Note that this action enables and disab les only bridging at the specified por t, and not the interf ace itself .
Basic Alar m Configuration 3-9 Alar m Configuration Disabling a Basic Alarm Using the button at the bottom of the window actually performs two functions: it both disables the alarm and deletes the alarm entry (and its associated event and action entries) from device memory to help conserve device resour ces.
Alar m Configuration 3-10 Basic Alarm Configuration Figure 3-2. Basic Alarm Log The top portion of the Basic Alarm Log window contains the device information boxes, as well as the Port Number assign.
Adv anced Alar m Configuration 3-11 Alar m Configuration Ad v anced Alarm Configuration The Basic Alarm Configuration window provides a quick and easy way to set up some basic alarms for all of the interfaces installed in your 9H42x-xx.
Alar m Configuration 3-12 Advanced Alarm Configuration The top portion of the window displays the usual device information boxes; the remainder of the window contains the Alarms W atch and Events W atch lists, and the command buttons that allow you to create, edit, and delete entries in those lists, or refr esh the display .
Adv anced Alar m Configuration 3-13 Alar m Configuration (such as the Hosts component), not present, or unreachable, or it may have been deleted by softwar e but not yet removed fr om memory at the device.
Alar m Configuration 3-14 Advanced Alarm Configuration Creating and Editing an Adv anced Alarm The Create/Edit Alarms window ( Figure 3-4 ) allows you to both cr eate new alarms and edit existing ones.
Adv anced Alar m Configuration 3-15 Alar m Configuration If you wish to create an entirel y new alarm , it doesn’t matter which e xisting alar m (if any) is highlighted when y ou open the Create/E.
Alar m Configuration 3-16 Advanced Alarm Configuration 4. T o select the V ariable to be used for y our alar m, use the MIBT ree panel provided on the right side of the window . (For more inf or mation about how to use the MIBT ree panel, see the MIB T ools chapter in the T ools Guide .
Adv anced Alar m Configuration 3-17 Alar m Configuration located in an RMON Statistics table , you can deter mine the appropriate instance by noting the inde x number assigned to the table that is collecting data on the interf ace you’ re interested in.
Alar m Configuration 3-18 Advanced Alarm Configuration 6. In the Alarm Interval field, enter the amount of time o ver which the selected v ariable will be sampled. At the end of the interval, the sample v alue will be compared to both the rising and falling thresholds .
Adv anced Alar m Configuration 3-19 Alar m Configuration 7. Since the first sample taken can be misleading, y ou can use the selections in the Startup Alarm box to disab le either the rising or the falling threshold f or that sample only .
Alar m Configuration 3-20 Advanced Alarm Configuration 13. Click to set y our changes. If you ha ve made an y errors in configuring alar m parameters (using an in valid v alue in any field, lea ving a field blank, or selecting an alarm variable which is not resident on the de vice), an error window with the appropriate message will appear .
Adv anced Alar m Configuration 3-21 Alar m Configuration Figure 3-5. The RMON Create/Edit Events W indow 2. If y ou are creating a new e vent , use the Index field to assign a unique , currently unused inde x n umber to identify the e v ent.
Alar m Configuration 3-22 Advanced Alarm Configuration 3. Click in the Description te xt bo x to enter any te xt descr iption you w ant to identify the e v ent. This description will appear in the Events W atch window and help you distinguish among the e vents y ou hav e configured.
Adv anced Alar m Configuration 3-23 Alar m Configuration c. Select both Log and T rap to both log the ev ent occurrence and generate the traps . If you select neither option, the e vent’ s occurre.
Alar m Configuration 3-24 Advanced Alarm Configuration Figure 3-6. The RMON Create/Edit Actions W indow 2. The inde x number and description of the e vent with which the action or actions will be associated is displa yed in the Event: field at the top of the window .
Adv anced Alar m Configuration 3-25 Alar m Configuration Element Manager T ools Guide .) The displa y will def ault to the top of the tree (labeled Internet); there are three wa ys to locate and/or assign the correct variab le: a.
Alar m Configuration 3-26 Advanced Alarm Configuration Deleting an Alarm, Event, or Action T o delete an alarm, event, or action: 1. In the appropriate window , highlight the alarm, ev ent, or action you wish to remov e. 2. Click on to remove . A window will appear asking you to confirm your selection; click on to delete, or on to cancel.
How Rising and F alling Thresholds Work 3-27 Alar m Configuration The top portion of the window contains the device information boxes, as well as the event index number and the event description; the.
Alar m Configuration 3-28 How Rising and F alling Thresholds Work Figure 3-8. Sample Rising and Falling Threshold Pairs TIP The current version of the Basic Alarms window only allows you to configur.
4-1 Chapter 4 Statistics Accessing MIB-II interf ace or RMON statistics from the Module View; a v ailable statistics windo ws Each port menu in the 9H42x-xx Module V iew provides two statistics selections: Statistics and I/F Statistics .
Statistics 4-2 RMON Statistics RMON Statistics The RMON Ethernet Statistics window ( Figure 4-1 ) pr ovides a detailed statistical breakdown of traf fic on the monitored Ethernet network — includin.
RMON Statistics 4-3 Statistics Ethernet statistics are: Bytes Displays the total number of bytes contained in packets processed on the network segment. This number includes bytes contained in error packets. P ackets Displays the total number of packets processed on the network segment.
Statistics 4-4 RMON Statistics Fragments Indicates the number of packets processed by the network segment that were undersized (less than 64 bytes in length; a runt packet) and had either a non-integral number of bytes (alignment error) or a bad frame check sequence (CRC error).
RMON Statistics 4-5 Statistics The percentages displayed to the right of the numerical values for these fields indicate what percentage of all packets transmitted on the network segment wer e of the noted size.
Statistics 4-6 Interf ace Statistics T o temporarily freeze the statistics display , select the Freeze Stats option; in this mode, statistics will continue to be collected, but the display will not update. T o resume normal updates, click again to de-select the fr eeze option.
Interf ace Statistics 4-7 Statistics Figure 4-3. Interface Statistics W indow Three informational fields appear in the upper portion of the window: Description Displays the interface description for the currently selected port: Ethernet or INB. Address Displays the MAC (physical) address of the selected port.
Statistics 4-8 Interf ace Statistics The lower portion of the window provides the following transmit and r eceive statistics; note that the first four statistics are also graphically displayed in the pie charts. Unicast Displays the number of packets transmitted to or received fr om this interface that had a single, unique destination address.
5-1 Chapter 5 Bridging Bridge management ov er view; the Bridge Status window; bridge P erformance Graphs; changing bridge Spanning T ree parameters; configuring the Filtering Database; setting duple.
Bridging 5-2 An Ov er view of Bridge Management return a r esponse to the source node that contains the route information field indicating which bridge paths the explorer packets took.
The Bridge Status Windo w 5-3 Bridging • W ith the Filtering Database window , you can see the contents of the Static and Learned databases — the two address databases which constr uct the IEEE 802.1d Source Address T able. The switch uses the contents of these databases to make its packet filtering and forwarding decisions when using 802.
Bridging 5-4 The Bridge Status Window Figure 5-1. The Bridge Status W indow The Bridge Status window provides the following information for each individual bridging interface; the and buttons allow you to scroll the display to show all available bridge port interfaces.
The Bridge Status Windo w 5-5 Bridging • Learning (magenta) — the Forwarding database is being created or the Spanning Tree Algorithm is being executed due to a network topology change; the port is monitoring network traffic, learning network addresses.
Bridging 5-6 Enabling and Disab ling Br idging Enabling and Disab ling Bridging When you disable a bridge port, you disconnect that port’s network from the bridge entirely . The port does not forward any packets, nor does it participate in Spanning T ree operations.
Bridge Statistics 5-7 Bridging from the Module View windo w: 1. Click on the Bridge label just abo v e the por t status displa ys; the Bridge menu will appear . 2. Drag down to Enable Bridge to enable bridging across all interf aces, or to Disable Bridge to disable bridging across all interf aces.
Bridging 5-8 Bridge Statistics Figure 5-2. Bridge Performance Graph T o access the individual bridge port interface Performance Graph windows: 1. F rom the Br idge Status window , click on the appropriate port button ( ) to displa y the por t menu.
Bridge Statistics 5-9 Bridging Filtered (Magenta) Filtered The total number of frames filtered by the bridge, at the device or port level. Nothing The Filtered scale is not curr ently measuring the number of packets filtered by the bridge.
Bridging 5-10 Using Source Addressing Using Sour ce Addressing The Source Addressing featur e allows you to display a list of the MAC addresses communicating through each bridge port interface available on the selected 9H42x-xx module. T o access the Source Addressing windows: 1.
Bridge Spanning T ree 5-11 Bridging 2. T ype in the new Ageing Time , in seconds, then clic k on . The allowab le range is 10 to 1,000,000 seconds . Bridge Spanning T ree The Bridge Spanning T ree win.
Bridging 5-12 Bridge Spanning T ree T o access the Bridge Spanning T ree window: 1. F rom the Br idge Status window , click on to display the Bridge Status menu. or F rom the Module View window , click on the Bridge label just abov e the por t status displa y; the Bridge menu will appear .
Bridge Spanning T ree 5-13 Bridging Bridge-level P arameters The Bridge Spanning T ree window pr ovides the following bridge-level information: Bridge Priority This field displays the “priority” component of the 9H42x-xx module’s unique bridge identifier .
Bridging 5-14 Bridge Spanning T ree Protocol Displays the Spanning T ree Algorithm Protocol type the 9H42x-xx module is currently using. The choices ar e: • 802.1 • DEC (DEC Lanbridge 100) • None The following four fields display values used for various Spanning T ree timers in the course of normal operations.
Bridge Spanning T ree 5-15 Bridging expires, the port transmits its Configuration BPDU to send configuration information to the Root. The Hold T ime is a fixed value, as specified by the IEEE 802.
Bridging 5-16 Bridge Spanning T ree Designated P or t Displays the network address portion of the Port ID (which includes a manageable Priority component) of the port believed to be the Designated Port for the LAN associated with this port.
Bridge Spanning T ree 5-17 Bridging Changing the Spanning T ree Algorithm Protocol T ype T o change the type of protocol used in Spanning T ree: 1. Click the mouse on the appropriate option button: IEEE 802.1 , DEC , or None . 2. Click on . The selected Spanning T ree Algorithm protocol type will be applied to the bridge.
Bridging 5-18 Bridge Spanning T ree Changing Forwarding Dela y Time If the 9H42x-xx module is the Root Bridge or attempting to become the Root, and you want to change the time period the bridge will spend in the Listening state (e.
Filtering Database 5-19 Bridging Filtering Database When the 9H42x-xx switch is using T ransparent Bridging, the Filtering Database, which makes up the IEEE 802.1d Source Address T able, is used to determine which frames will be forwarded or filter ed between the 9H42x-xx module’s bridging interfaces.
Bridging 5-20 Filtering Database At the Filtering Database window ( Figure 5-5 ), you can view the number of entries of each type: Permanent, Static, Dynamic, or Learned. Figure 5-5. The Filtering Database W indow A scrollable Address Entry panel allows you to: • V iew the address entries in the Filtering Database.
Filtering Database 5-21 Bridging T o access the Filtering Database window: 1. F rom the Br idge Status window , click on to display the Bridge Status menu. or F rom the Module View window , click on the Bridge label just abov e the por t status displa y; the Bridge menu will appear .
Bridging 5-22 Filtering Database T ype Indicates the type of an entry in the database. The possible types are Static, Dynamic, Learned, Self, or Permanent. Y ou can alter the entry type, as described in the next section. Source P ort Indicates the index number of the port on which the address entry was first detected.
Filtering Database 5-23 Bridging clicking , a text box will appear stating “Changes have been made. Cancel them?”. Click on Ye s to exit the window without changing the Filtering Database, or No to return to the window . Altering the Ageing Time T o alter the Ageing T ime for Dynamic and Learned entries: 1.
Bridging 5-24 Filtering Database Changing the P or t Filtering Action Y ou can change the Port Filtering action at each bridge port from its curr ent action to the opposing action. 1. Maneuver the scroll bar until the desired port is in the P or t Filtering panel.
Configuring Duplex Modes 5-25 Bridging T o delete an address: 1. Click to highlight the address entry in the Address Entr y panel that you wish to delete from the filtering database.
Bridging 5-26 Configur ing Duple x Modes available standard Ethernet interface; windows accessed fr om the individual bridge port menus allow you to configure duplex mode operation for the selected interface only . T o access the Duplex Modes window: 1.
Configuring Duplex Modes 5-27 Bridging T o configure the Duplex Mode for any standar d Ethernet interface: 1. In the Duple x Modes window , highlight the interface whose Duple x Mode you wish to change. Note that only one interface can be selected at a time.
Bridging 5-28 Configur ing Duple x Modes.
Inde x-1 Index Numerics 9H42x-xx devices described 1-1 A absolute value 3-2, 3-12, 3-19 accessing the RMON Alarm/Event list 3-11 accessing the RMON Statistics window 4-1 Accum 4-5 Actions MIB 3-23 Adm.
Inde x Inde x-2 Event T ype 3-22 Events W atch 3-12, 3-13 F falling action 3-5, 3-8 falling alarm threshold 3-1, 3-2, 3-5, 3-6, 3-8, 3-12, 3-18, 3-19 FallingEventIndex 3-19 Fast Ethernet Port Interfac.
Inde x-3 Inde x peak values 4-2, 4-3, 4-4, 4-5 Permanent entries 5-19 Polling Interval 3-5 port configuration 5-26 port display , color codes 2-2 Port Filtering 5-22 Port Number 3-4 Port Status 2-3 c.
Inde x Inde x-4.
An important point after buying a device Cabletron Systems 9H42X-XX (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought Cabletron Systems 9H42X-XX yet, this is a good time to familiarize yourself with the basic data on the product. First of all view first pages of the manual, you can find above. You should find there the most important technical data Cabletron Systems 9H42X-XX - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, Cabletron Systems 9H42X-XX you will learn all the available features of the product, as well as information on its operation. The information that you get Cabletron Systems 9H42X-XX will certainly help you make a decision on the purchase.
If you already are a holder of Cabletron Systems 9H42X-XX, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime Cabletron Systems 9H42X-XX.
However, one of the most important roles played by the user manual is to help in solving problems with Cabletron Systems 9H42X-XX. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device Cabletron Systems 9H42X-XX along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
