Instruction/ maintenance manual of the product AT-2972SX Allied Telesis
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613-000492 Rev. A Advanced Control Suite Gigabit Ethernet Network Adapters AT-2916SX AT-2931SX User’s Guide.
Copyright © 2006 Allied Telesyn, Inc. All rights reserved. No part o f this pub lication may be repro duced without prior wr itten permission from Al lied Telesyn, Inc. Microsoft and Internet Explorer are register ed trademarks of Microsoft Corporation.
3 Preface .............. ............ ........... ........... .............. ........... ........... ............ ........... .............. ...... ........ ........... ........... ............ ......... 9 Where to Find Web-based Guides ............. .
Contents 4 Chapter 4: In stalling BAC S on a Linux System ................. ........... .............. ........... ............ ........... .............. ........... .........67 BASP Driver for Linux ...... ............................ ..............
5 Figure 1. Advanced Control Suite 2 Menu ................. ............ .............. .............. ........... .............. ..... ....................... ............. 20 Figure 2. Vital Sign Tab ................. .............. ............ ...
Figures 6.
7 Table 1. BACS Application Information ............... ... ..... .............. ........... ............ ........... ........... ...... .. ............ ........... ............. 21 Table 2. Contents of the release.t xt File ............. ............
Tables 8.
9 Pr eface This guide contains instructions on ho w to install and configure the Advanced Control Suite software for the AT-2916SX an d AT-2931SX Ethernet network adapters on Windows 2000, Windows 2003, and Linux platforms.
Preface 10 Where to Find Web-based Guides The installation and user guides fo r all Allied Telesyn products are available in portable document format ( PDF) on our web site at www.alliedtelesyn.com . You can view the docu ments online or download them onto a local workstation or server.
Advanced Control Sui te User’s Guide 11 Contacting Allied Telesyn This section provides Allied Telesyn con tact information for technical support as well as sales and corporate information. Online Support You can request technical support onli ne by accessing the Allied Telesyn Knowledge Base: http://kb.
Preface 12.
13 Chapter 1 Advanced Server Pr ogram Overview This chapter provides an introduction to the Allied Te lesyn Advanced Server Program and contains following sections: “Broadcom Advanced Server Pro.
Chapter 1: Advan ced Server Program Overview 14 Broadcom Advanced Server Program (BASP) Overview BASP is an intermediate software dr iver for Windows Server 2003, Windows 2000, and Linux tha t provides load-balancing, fault-tolerance, and VLAN features.
Advanced Control Sui te User’s Guide 15 Broadcom Advanced Control Suite 2 (BACS 2) Features The Broadcom Advanced Control Suite 2 (BACS 2) is a graphical u ser interface with the following functions. (See Chapter 2, “Broadcom Advanced Control Suite 2 (BACS 2) Applications” on page 19 f or additional information.
Chapter 1: Advan ced Server Program Overview 16 BASP for Windows 2000 and Windows 2003 The following options are supported under Windows 20 00 and Windows 2003. For additional information, se e Chapter 3, “Installing BACS on Windows 2000 and Windows 2003 Systems” on page 63.
Advanced Control Sui te User’s Guide 17 BASP for Linux The following options are sup ported under Linux. For additional information, see Ch apter 4, “Installing BACS on a Linux System” on page 67.
Chapter 1: Advan ced Server Program Overview 18.
19 Chapter 2 Br oadcom Advanced Contr ol Suite 2 (BACS 2) Applications This chapter describes the Broadcom Ad vanced Control Suite 2 (BACS 2) applications and contain s the following sections: “.
Chapter 2: Broadc om Advanced Control Suit e 2 (BACS 2) Applications 20 Overview The Broadcom Advanced Control Suite 2 (BACS 2) application is an integrated application (with a graphical user inte rface) that provides useful information about each network adapter that is installed in your computer.
Advanced Control Sui te User’s Guide 21 Information Provided by the BACS 2 Applications The Broadcom Advanced Control Suite 2 lists all of the network adap ters in your computer and provides the foll owing information, if available, about each device, as shown in Table 1.
Chapter 2: Broadc om Advanced Control Suit e 2 (BACS 2) Applications 22 “BASP S tatistics T ab” on p age 41. Configures the load balance and failover by grouping multip le network adapters.
Advanced Control Sui te User’s Guide 23 Installing the BACS 2 Application You can install the BACS 2 software th rough the GUI or by using the silent install option.
Chapter 2: Broadc om Advanced Control Suit e 2 (BACS 2) Applications 24 Note Before you begin the installation, close all application s, windows, and dialog boxes.
Advanced Control Sui te User’s Guide 25 Managing the BACS Application This section contains the followin g procedures for managing t he BACS application: “Initializing the BACS 2 Application,.
Chapter 2: Broadc om Advanced Control Suit e 2 (BACS 2) Applications 26 2. Click Broadcom Management Programs and click Change/Remove (Windows XP) or Add/Remove (Windows 2000). 3. Click Next . 4. In InstallShield Wizard , click Remove , and then click Next .
Advanced Control Sui te User’s Guide 27 Configuring the BACS 2 Application Start the BACS application and then click the tab on Broadcom Advanced Control Suite 2 that provides the information of in terest or access to the tests, diagnostics, analyses, and configuration functions you want to perform.
Chapter 2: Broadc om Advanced Control Suit e 2 (BACS 2) Applications 28 Note Information about network adapters made by oth er vendors is less comprehensive than the information provide d about the Allied Telesyn AT-2916 and AT-2931 ada pters or other Broadcom-based adapters.
Advanced Control Sui te User’s Guide 29 device has not been loaded by Windows. – Information Not Available . The value is not obtainable from the driver that is associa ted with the device. Driver Name/V ersion/Date . The file name, version, and creation dat e of the software driver that is associated with the device.
Chapter 2: Broadc om Advanced Control Suit e 2 (BACS 2) Applications 30 Resources Tab This sectio n describes the Resources tab, as shown in Figure 3. Figure 3. Resources Tab The Resources tab contains the following fields: Bus T ype. Indicates t he PCI bus type (PCI or PCI-X).
Advanced Control Sui te User’s Guide 31 Hardware Tab This section provides a descrip tion of the Hardware tab, as shown in Figure 4. Figure 4. Hardware Tab The Hardware tab contains the following fields: ASIC V ersion . The chip version of the adapter .
Chapter 2: Broadc om Advanced Control Suit e 2 (BACS 2) Applications 32 Advanced Tab This section describ es the Advanced tab, as shown in Figure 5 Figure 5.
Advanced Control Sui te User’s Guide 33 only 2 pairs of wires are available in the cabling plant. By default, this property is set to Enable. T o disa ble Ethernet@Wirespeed, change the setting to Disable. Note This parameter is available o nly for copper devices and is not displayed for the AT-2916SX and AT-2931SX adapters.
Chapter 2: Broadc om Advanced Control Suit e 2 (BACS 2) Applications 34 – Value. Assigns a unique node address for the adap ter. – Not Present (Default).
Advanced Control Sui te User’s Guide 35 speed and duplex mode. A speed of 1 Gbit/s is enabled by selecting Auto, when that speed is suppo rted. W ake Up Cap abilities . The W ake Up Capabilities property enables the network adapter to wake up from a low-power mode when it receives a network wake-up frame.
Chapter 2: Broadc om Advanced Control Suit e 2 (BACS 2) Applications 36 test uses TCP/IP, as shown in Figure 6. Figure 6. Network Test Tab Diagnostics Tab On the Diagnostics tab you can perfo rm diagnostic tests on Allied Telesyn network adapters.
Advanced Control Sui te User’s Guide 37 Note The network connection is temporarily lost when the diagnostic tests are running. Figure 7. Diagnostics Tab The Diagnostics tab contain s the following fields: Control Registers .
Chapter 2: Broadc om Advanced Control Suit e 2 (BACS 2) Applications 38 On-Chip CPU . This test verifies the operation of the internal CPUs in the device. Interrupt . This test verifies that the NDIS driver is able to receive interrupts from the d evice.
Advanced Control Sui te User’s Guide 39 General Statistics Definitions of the general statis tics parameters are provided be low. Frames Tx OK . A count of frames that are successfully tran smitted. This counter is incremented when the transmit st atus is reported as T ransmit OK .
Chapter 2: Broadc om Advanced Control Suit e 2 (BACS 2) Applications 40 counter is incremented when the result o f a transmission is report ed as T ransmit OK and the attempt value is 2. Frames Tx with more than one Colli sion . A count of frames that are involved in more than one collision and are subse quently transmitted successfully .
Advanced Control Sui te User’s Guide 41 MAC Rx w/ Pause Command and Length greater tha n 0 . MAC control frames with the p ause command and a length greater than 0. MAC Rx w/ no Pause Command . MAC control frames with no pa u s e command. MAC Sent X-on .
Chapter 2: Broadc om Advanced Control Suit e 2 (BACS 2) Applications 42 Configuring Teaming The teaming function allows you to group available network devices together to function as a team. Teaming is a method of creating a virtual LAN (a group of multiple devices t hat function as a single device).
Advanced Control Sui te User’s Guide 43 Link Aggregation . In this type of team, you can dynamically configure the network adapters that have been se lected to part icipate in a given team. If the link part ner is not correctly configured for IEEE 802.
Chapter 2: Broadc om Advanced Control Suit e 2 (BACS 2) Applications 44 The Welcome page of th e Broadcom T eaming Wizard is shown in Figure 1 1. Figure 11. Broadcom Teamin g Wizard Welcome Page 2. Click Next . The T eam Name p age asks for a name for the tea m, as shown in Figure 12.
Advanced Control Sui te User’s Guide 45 Note The number of characters that c an be used in a team name is a minimum of 1 and a maximum of 39. Note A team name cannot begin with spaces or contain the character "&". Note Team names must be unique.
Chapter 2: Broadc om Advanced Control Suit e 2 (BACS 2) Applications 46 Smart Load Balancing and Failover . In this type of team, a st andby member handles the traf fic if all of the load balance members fail (a failover event). All load balan ce members have to fail befo re the standby membe r takes over .
Advanced Control Sui te User’s Guide 47 5. Add or remove team members from th e Available Adapters list to the Team members list, as shown in Figure 15, until you have all the members of the team identified. Figure 15. Team Member Selection 6. Click Next .
Chapter 2: Broadc om Advanced Control Suit e 2 (BACS 2) Applications 48 Use the following member as a standby member Enable Auto-Fallback Di sable Mode . When this o ption is enabled, a standby me mber handles the traf fic if all of the load balance members fail (a failover event).
Advanced Control Sui te User’s Guide 49 Figure 18. Configuring LiveLink Page The options are: Yes . When you select this option, another page opens where you configure this feature. No . This option does not allow you to configure LiveLink. This is the default and the setting that Allied Telesyn recommends.
Chapter 2: Broadc om Advanced Control Suit e 2 (BACS 2) Applications 50 The options are: Yes . Allows you to configure a VLAN. Proceed to step 10. No . Skips the VLAN creation process. Proceed to ste p 13. 10. Click Next . The VLAN Naming page, as shown in Figure 20, asks for a name for the VLAN.
Advanced Control Sui te User’s Guide 51 Figure 21. VLAN Tagging Page The options are: Untagged . This option does not in sert a VLAN tag ID into the Ethernet packet, but relies on the switch configuration for VLAN membership. Tagged . This option inserts the VLAN tag ID into th e Ethernet packet to identify its VLAN ID or membe rship.
Chapter 2: Broadc om Advanced Control Suit e 2 (BACS 2) Applications 52 Figure 22. Additional VLANs Page 13. Click Yes if you want to create more VLANs and you will be repeating steps 11 and 12. or No if you do not want to create anothe r VLAN. When you click No , the final wizard pag e is displayed, as shown in Figure 23.
Advanced Control Sui te User’s Guide 53 Suite 2 . A warning message is displayed, as shown in Figure 24. Figure 24. Commit Changes Warnin g Message Click Y es to complete the process and return to the Broadcom Advanced Control Suite main window , or No to not save the changes.
Chapter 2: Broadc om Advanced Control Suit e 2 (BACS 2) Applications 54 The Welcome page of th e Broadcom T eaming Wizard is shown in Figure 26. Figure 26. Broadcom Teamin g Wizard Welcome Page 2. Click Expert Mode . The New T eam Configuration window opens, as shown in Figure 27 on page 54.
Advanced Control Sui te User’s Guide 55 Note The number of characters that c an be used in a team name is a minimum of 1 and a maximum of 39. Note A team name cannot begin with spaces or contain the character "&". Note Team names must be unique.
Chapter 2: Broadc om Advanced Control Suit e 2 (BACS 2) Applications 56 The New Team Configuration window opens, as shown in Figure 28. Figure 28. New Team Configuration Menu 5. Assign any available device or devic es to the team by moving the device from the Available Adapters list to the Load Balance Members list.
Advanced Control Sui te User’s Guide 57 Note When you create Generic Trunkin g and Link Aggregation teams, you cannot designate a Standby Membe r. Standby members work only with Smart Load Balance and Failover and SLB (Auto -Fallback Disable) types of teams.
Chapter 2: Broadc om Advanced Control Suit e 2 (BACS 2) Applications 58 The T eam Properties t ab is displayed with the properties of th e team you selected, as shown in Figure 29.
Advanced Control Sui te User’s Guide 59 Note Disabled adapters are not recog nized and they prevent the creation of a VLAN. If you attempt to create a VLAN with a disabled adapter, an error message is displayed. To configure a team with a VLAN, p erform the following procedure.
Chapter 2: Broadc om Advanced Control Suit e 2 (BACS 2) Applications 60 5. Click Apply . 6. Click Yes when you see the message indicating that the n etwork connection will be temporarily interrupted. The available adapters are listed (these adapters are not currently members of any team).
Advanced Control Sui te User’s Guide 61 1. In BACS2, select the VLAN name in the team’s Virtual Adapters folder, as shown in Figure 31 on page 60. 2. Right-click the VLAN name and select click Remove VLAN . 3. Click Apply . 4. Click Yes when you see the message indicating that the network connection will be temporarily interrupted.
Chapter 2: Broadc om Advanced Control Suit e 2 (BACS 2) Applications 62 The is Open dialog box is shown in Figure 31. Figure 33. Save As Dialog Box 2. Click the name of the file to be restored and click Open . Note You may need to navigate to the folder where the file is loca ted.
63 Chapter 3 Installing BACS on W indows 2000 and W indows 2003 Systems This chapter provides procedures for installing the BACS application and configuring teaming on Windows 20 00 and Windows 2003 syste ms.
Chapter 3: Inst alling BACS on Windows 2000 and Windows 2003 Sy stems 64 Installing the BASP For BASP installation procedures, refer to Chapter 2, “Broadcom Advanced Control Suite 2 (BACS 2) Applications” on page 1 9.
Advanced Control Sui te User’s Guide 65 Uninstalling the BASP To uninstall the Broadcom Advance d Server Program Driver Properties (BASP), perform the following procedure: 1. Open the Control Panel 2. Double-click the Add or Remove Programs button. 3.
Chapter 3: Inst alling BACS on Windows 2000 and Windows 2003 Sy stems 66.
67 Chapter 4 Installing BACS on a Linux System This chapter describes the installa tion and configuration of the BASP driver on Linux. It includes the following section: “BASP Driver for Linux.
Chapter 4: Inst alling BACS on a Linux Sys tem 68 BASP Driver for Linux On newer Distributions and Kernels, it may be necessary to remove the BASP Driver for Linux BASP is a kernel module designed for 2.4.x kernels that provides load- balancing, fault-tolerance, and VLAN feature s.
Advanced Control Sui te User’s Guide 69 Packaging BASP is released in two packaging fo rmats: source RPM and compressed tar formats. The file names for the t wo packages are basplnx- <version> .src. <arch> .rpm and basplnx- <version> .
Chapter 4: Inst alling BACS on a Linux Sys tem 70 Installing BASP BASP for Linux is shipped in mixed fo rms, where the pla tform and kernel specific files are in source code and the core file is in o bject form. Three packages are shipped in this release: two tar archives and two RPM packages.
Advanced Control Sui te User’s Guide 71 Installing the BASP Source RPM Package for Red Hat and United Linux To install the BASP RPM source package for Red Hat and United Linux 1.x based distributions, perfo rm the following procedure. 1. To install the RPM source package, run % rpm -i basplnx- {version} .
Chapter 4: Inst alling BACS on a Linux Sys tem 72 Installing the BASP TAR Archive Use the procedures in this section to install Linux i386 distributions that are neither Red Hat nor United Linux distributions. Installing the BASP TAR archive involves both uncomp ressing the archive and then installing it.
Advanced Control Sui te User’s Guide 73 BASP Files See Table 2 for a list of the BASP files. T able 2. Content s of the release.txt File Filename Description Makefile makefile baspcfg precompiled c onfiguration utility bcmtype.h commonly used type header file blf.
Chapter 4: Inst alling BACS on a Linux Sys tem 74 BASP Configuration for Red Hat and United Linux Distributions This section describes the BASP Conf iguration for Red Hat and United Linux 1.x based distribut ions. The BASP distributi on includes a utility program and several scripts for team configuratio n.
Advanced Control Sui te User’s Guide 75 To configure BASP, perform the following procedure: 1. Copy a configuration script from the "/etc/basp/sa mples" directory to the "/etc/basp" directory. Note The configuration script name must be prefixed with "team-".
Chapter 4: Inst alling BACS on a Linux Sys tem 76 BASP Configuration and Start up for Other Linux Distributions BASP Configuration (baspcfg) is a command line tool that is used to configure the BASP teams, add/remo ve NICs, and add/remove virtual devices.
Advanced Control Sui te User’s Guide 77 Note You can only execute Baspcfg in Super Use r mode. Attempting to use baspcfg as a standard user d isplays the following error message, "Error in communicating to BASP Module. Is it loaded?". When you configure Teaming, one Primary Adapter is required.
Chapter 4: Inst alling BACS on a Linux Sys tem 78 BASP Configuration Scripts for Red Hat Distributions Both team-sample and team-gec are configuration scripts that follow the same syntax. See Table 5 for more information. Note Teaming scripts are intended for Red Hat and Unit ed Linux-based distributions ONLY.
Advanced Control Sui te User’s Guide 79 Broadcom NICE Patches Also included in this release are netwo rk device drivers patched with Broadcom NICE support. These d rivers are originally taken from the Linux 2.4.16 kernel distribution. To install patched drivers, perf orm the following procedure.
Chapter 4: Inst alling BACS on a Linux Sys tem 80 Uninstalling the RPM Package To uninstall a RPM package, perform th e following procedure. % rpm -e baspln x and to reboot the system, % reboot.
Advanced Control Sui te User’s Guide 81 Removal of Physical Interface in Generic Trunking and 802.3ad Mode In Generic Trunking and 802.3ad mode, all the physical and virtual interfaces belonging to a tea m have the same MAC address. This MAC address is the same address as that of the f irst physical interface bounded to the team.
Chapter 4: Inst alling BACS on a Linux Sys tem 82 BASP SNMP Agent for Linux This SNMP agent is designed to suppor t the configuratio n and statistics information pertaining to the BASP driver. The BASP SNMP agent is available in two packaging formats: TAR archive and RPM.
Advanced Control Sui te User’s Guide 83 7. The snmpget and snmpgetnext commands can be used to receive the BASP snmp objects such as: % snmpget local host public BASP-Config-M IB::btTea mNumber % snmpgetnext localhost pu blic BASP-Conf ig- MIB::btTeam Number BASP SNMP objects are provided in the following text files: – BASP-Config-MIB.
Chapter 4: Inst alling BACS on a Linux Sys tem 84 Uninstalling the RPM Package (Both Source and Binary) To uninstall RPM package, run: % rpm -e b aspsnmp-{ version}.i3 86.rpm and to reboot the system, % reboot Known Problems The 802.3ad team member links disconnect and reconnect continuou sly when connected to the HP2524 switch.
85 Chapter 5 Key Pr otocols and Interfaces This chapter describes the key protoc ols an d interfaces. It contains the following sections: “Adapter T eaming” on pa ge 86 “Failover T eamin.
Chapter 5: Key Prot ocols and Interf aces 86 Adapter Teaming Teaming provides traffic load balancing and redu ndant adapter operation in the event that a network connection fails. When multiple Allied Telesyn adapters are installed in the same server, they can be group ed into teams.
Advanced Control Sui te User’s Guide 87 Basically, generic link aggregation mode is a "light" version of the 802.3ad link aggregation and is often refe rred to as 802.3ad static. This approach is much simpler because there is not a formalized link aggre gation control protocol.
Chapter 5: Key Prot ocols and Interf aces 88 Failover Teaming Failover Teaming provides a redundant adapter operation in th e event that a network connection fails. When multip le Gigabit Ethernet Adapters a re installed in the same server, they can be paired into teams.
Advanced Control Sui te User’s Guide 89 VLANs Overview VLANs allow you to split your physical LAN into logical subparts, to create logical segmentation of workgroups, a nd to enforce security policies among each logical segment.
Chapter 5: Key Prot ocols and Interf aces 90 Figure 34 on page 89 shows an example net work that uses VLANs. In this example network, the physical LAN consists of a switch, two servers, and five clients. The LAN is logically organized into th ree different VLANs, each representing a different IP subnet.
Advanced Control Sui te User’s Guide 91 Note VLAN tagging is only required to b e enabled on switch po rts that create trunk links to other switches. It is also required o n ports connected to tag-capable end-sta tions, such as servers or workstations with adapters.
Chapter 5: Key Prot ocols and Interf aces 92 32-bit or 64-bit PCI Bus Master Compliant with PCI Local Bus Rev 2.2, the PCI interface on the Gigabit Ethernet Adapter is compatible with both 32-bit and 64-bit PCI buses. As a bus master, the adapter requests access to the PCI bus, instead of waiting to be polled.
93 Chapter 6 T r oubleshooting This chapter describes troubleshoo ting p rocedures and contains the following sections: “V erifying the Correct Drivers are Loaded” on page 94 “Software P.
Chapter 6: Tro ubleshooting 94 Verifying the Correc t Drivers are Loaded The following section describes how to check if the correct drivers are loaded for Windows and Linux. Windows The Broadcom Advanced Control Suite, Vital Sign tab allows you to view vital adapter information, networ k status, and network connectivity.
Advanced Control Sui te User’s Guide 95 Linux To verify that the Linux Driver soft ware is loaded correctly, perform the following procedure. 1. To verify that the bcm5700.
Chapter 6: Tro ubleshooting 96 Software Problems and Solutions This section describes common software problems and solutions and contains the following subsections: “Windows 2000” on p age 96 .
Advanced Control Sui te User’s Guide 97 Problem : Team configuration is n ot retained when you edit it. Solution : In configuring BASP team confi guration, the actual change s of the configuration a re not committed unt il you click "OK" in the "Network Properties" window.
Chapter 6: Tro ubleshooting 98 Broadcom Advanced Server Program (BASP) This section lists known BASP problems and solutions that apply to all operating systems. Problem : 802.3ad team member links disco nnect and reconnect continuously. Solution : This is a 3rd party issue.
99 Chapter 7 Manageability Featur es This chapter describes the magageab ility features and contains the following sections: “CIM” on page 100 “SNMP” on page 101.
Chapter 7: Managea bility Featur es 100 CIM The Common Information Model (CIM) is an indust ry standard defined by the Distributed Management Task Force (DMTF). Microsoft imple ments CIM on Windows platforms such as Windows 2000 and Windows Server 2003 systems.
Advanced Control Sui te User’s Guide 101 SNMP There are two SNMP agents for manageability: BASP Sub-agent BASP Extensible-agent See the following sections. BASP Sub-agent The BASP sub-agent, baspmgnt.dll, is desig ned for the Windows 2000 and Windows Server 2003 SNMP service.
Chapter 7: Managea bility Featur es 102 BASP Extensible- agent The Broadcom SNMP extensible-agent, bcmif.dll, is desig ned for the Windows 2000 and Windows Serve r 2003 SNMP service. The software requires that a Windows 2000 SNMP serv ice is installed bef ore installing the extensible-agent.
An important point after buying a device Allied Telesis AT-2972SX (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought Allied Telesis AT-2972SX 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 Allied Telesis AT-2972SX - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, Allied Telesis AT-2972SX you will learn all the available features of the product, as well as information on its operation. The information that you get Allied Telesis AT-2972SX will certainly help you make a decision on the purchase.
If you already are a holder of Allied Telesis AT-2972SX, 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 Allied Telesis AT-2972SX.
However, one of the most important roles played by the user manual is to help in solving problems with Allied Telesis AT-2972SX. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device Allied Telesis AT-2972SX 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
