Cisco Catalyst Blade Switch 3030 Hardware Installation Guide March 2006 Corporate Headquarters Cisco Systems, Inc. 170 West Tasman Drive San Jose, CA 95134-1706 USA http://www.cisco.
THE SPECIFICATIONS AND INFORMATION REGARDING THE PRODUCTS IN THIS MANUAL ARE SUBJECT TO CHANGE WITHOUT NOTICE. ALL STATEMENTS, INFORMATION, AND RECOMMENDATIONS IN THIS MANUAL ARE BELIEVED TO BE ACCURATE BUT ARE PRESENTED WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED. USERS MUST TAKE FULL RESPONSIBILITY FOR THEIR APPLICATION OF ANY PRODUCTS.
C O N T E N T S Preface vii Audience Purpose vii vii Organization vii Conventions viii Statement 1071—Warning Definition Related Publications viii xiii Obtaining Documentation xiv Cisco.
Contents Management Options 1-6 Using the Device Manager 1-6 Using the Command-Line Interface Using SNMP 1-7 Network Configurations 1-7 CHAPTER Switch Installation 2 1-7 2-1 Preparing for Installation 2-1 Warnings 2-1 Installation Guidelines 2-3 Verifying Package Contents 2-4 Dell Modular Server Chassis Architecture 2-5 Installing the Switch Module into the Server Chassis 2-6 Configuring the Switch Module 2-7 Connecting through the Switch Module Console Port Connecting through the DRAC/MC 2-9 Waiti
Contents SFP Module Ports B-3 Console Port B-3 Cable and Adapter Specifications B-4 Two Twisted-Pair Cable Pinouts B-4 Four Twisted-Pair Cable Pinouts for 1000BASE-T Ports Crossover Cable and Adapter Pinouts B-5 Identifying a Crossover Cable B-5 Adapter Pinouts B-6 APPENDIX C Configuring the Switch with the CLI-Based Setup Program B-4 C-1 Accessing the CLI Through the Console Port C-1 Taking Out What You Need C-1 Connecting to the Console Port C-2 Completing the Initial Configuration C-4 INDEX Cisco
Contents Cisco Catalyst Blade Switch 3030 Hardware Installation Guide vi OL-8389-01
Preface Audience This guide is for the networking or computer technician responsible for installing the Cisco Catalyst Blade Switch 3030—also referred to as the switch—into the Dell Modular Server Chassis—also referred to as the server chassis. We assume that you are familiar with the concepts and terminology of Ethernet and local area networking. Purpose This guide describes the hardware features of the Cisco Catalyst Blade Switch 3030.
Preface Conventions Appendix B, “Connector and Cable Specifications,” describes the connectors, cables, and adapters that can be used to connect to the switch. Appendix C, “Configuring the Switch with the CLI-Based Setup Program,” has an installation and setup procedure for a standalone switch. Conventions This document uses these conventions and symbols for notes, cautions, and warnings: Note Caution Means reader take note.
Preface Conventions Varoitus TÄRKEITÄ TURVALLISUUSOHJEITA Tämä varoitusmerkki merkitsee vaaraa. Tilanne voi aiheuttaa ruumiillisia vammoja. Ennen kuin käsittelet laitteistoa, huomioi sähköpiirien käsittelemiseen liittyvät riskit ja tutustu onnettomuuksien yleisiin ehkäisytapoihin. Turvallisuusvaroitusten käännökset löytyvät laitteen mukana toimitettujen käännettyjen turvallisuusvaroitusten joukosta varoitusten lopussa näkyvien lausuntonumeroiden avulla.
Preface Conventions Aviso INSTRUÇÕES IMPORTANTES DE SEGURANÇA Este símbolo de aviso significa perigo. Você está em uma situação que poderá ser causadora de lesões corporais. Antes de iniciar a utilização de qualquer equipamento, tenha conhecimento dos perigos envolvidos no manuseio de circuitos elétricos e familiarize-se com as práticas habituais de prevenção de acidentes.
Preface Conventions Aviso INSTRUÇÕES IMPORTANTES DE SEGURANÇA Este símbolo de aviso significa perigo. Você se encontra em uma situação em que há risco de lesões corporais. Antes de trabalhar com qualquer equipamento, esteja ciente dos riscos que envolvem os circuitos elétricos e familiarize-se com as práticas padrão de prevenção de acidentes. Use o número da declaração fornecido ao final de cada aviso para localizar sua tradução nos avisos de segurança traduzidos que acompanham o dispositivo.
Preface Conventions Cisco Catalyst Blade Switch 3030 Hardware Installation Guide xii OL-8389-01
Preface Related Publications Related Publications You can order printed copies of documents with a DOC-xxxxxx= number. For more information, see the “Obtaining Documentation” section on page xiv. These documents provide complete information about the switch and are available from this Cisco.com site: http://www.cisco.com/en/US/products/ps6748/tsd_products_support_series_home.
Preface Obtaining Documentation • Cisco 100-Megabit Ethernet SFP Modules Compatibility Matrix (not orderable but available on Cisco.com) • Cisco Small Form-Factor Pluggable Modules Compatibility Matrix (not orderable but available on Cisco.com) • Compatibility Matrix for 1000BASE-T Small Form-Factor Pluggable Modules (not orderable but available on Cisco.com) Obtaining Documentation Cisco documentation and additional literature are available on Cisco.com.
Preface Documentation Feedback Ordering Documentation Registered Cisco.com users may order Cisco documentation at the Product Documentation Store in the Cisco Marketplace at this URL: http://www.cisco.com/go/marketplace/ Nonregistered Cisco.com users can order technical documentation from 8:00 a.m. to 5:00 p.m. (0800 to 1700) PDT by calling 1 866 463-3487 in the United States and Canada, or elsewhere by calling 011 408 519-5055. You can also order documentation by e-mail at tech-doc-store-mkpl@external.
Preface Obtaining Technical Assistance Reporting Security Problems in Cisco Products Cisco is committed to delivering secure products. We test our products internally before we release them, and we strive to correct all vulnerabilities quickly. If you think that you have identified a vulnerability in a Cisco product, contact PSIRT: • For Emergencies only — security-alert@cisco.
Preface Obtaining Technical Assistance Access to all tools on the Cisco Technical Support & Documentation website requires a Cisco.com user ID and password. If you have a valid service contract but do not have a user ID or password, you can register at this URL: http://tools.cisco.com/RPF/register/register.do Note Use the Cisco Product Identification (CPI) tool to locate your product serial number before submitting a web or phone request for service.
Preface Obtaining Additional Publications and Information Severity 3 (S3)—Operational performance of the network is impaired, while most business operations remain functional. You and Cisco will commit resources during normal business hours to restore service to satisfactory levels. Severity 4 (S4)—You require information or assistance with Cisco product capabilities, installation, or configuration. There is little or no effect on your business operations.
Preface Obtaining Additional Publications and Information • Networking products offered by Cisco Systems, as well as customer support services, can be obtained at this URL: http://www.cisco.com/en/US/products/index.html • Networking Professionals Connection is an interactive website for networking professionals to share questions, suggestions, and information about networking products and technologies with Cisco experts and other networking professionals. Join a discussion at this URL: http://www.cisco.
Preface Obtaining Additional Publications and Information Cisco Catalyst Blade Switch 3030 Hardware Installation Guide xx OL-8389-01
C H A P T E R 1 Product Overview This chapter provides a functional overview of the Cisco Catalyst Blade Switch 3030, also referred to as the switch module or switch. The switch module is a 16-port Ethernet switch that can be installed in the Dell Modular Server Chassis to aggregate network traffic from the internal server blades. The Dell Modular Server Chassis—also referred to as the server chassis—is a system that supports up to ten server modules and up to four Ethernet switch modules.
Chapter 1 Product Overview Front Panel Description Front Panel Description Ten of the ports on the 16-port Gigabit Ethernet switch are internal 1000BASE-X ports that connect to the server chassis through the backplane. Figure 1-1 shows the console port, the two external 10/100/1000BASE-T copper ports, and the four external SFP module uplink ports that support 1000BASE-SX and 10/100/1000BASE-T copper. Only Cisco SFP modules are supported on the switch.
Chapter 1 Product Overview Front Panel Description 10/100/1000 Ports The two copper Ethernet ports operate at 10, 100, or 1000 Mbps and support autonegotiation and full-duplex operation. When set for autonegotiation, the port senses the speed and duplex settings of the attached device and advertises its own capabilities.
Chapter 1 Product Overview Front Panel Description LEDs The switch has eight LEDs including an LED for each external port, one LED for the console port, and one LED used by server chassis management board (see Figure 1-1). You can use the switch LEDs to monitor switch activity and performance. Graphical representations of the LEDs described in this section are visible in the device manager.
Chapter 1 Product Overview Rear Panel Description Port LEDs The port LEDs display information about each individual port. The port LEDs are green and/or amber. Table 1-3 describes the port LED colors and their meanings. Table 1-3 Meaning of Port LED Colors LED Color Meaning Off No link established Solid green Link established but no activity Blinking green Traffic on an established link Solid amber Port disabled, either error or STP1 disabled Alternating green and amber Link fault 1.
Chapter 1 Product Overview Management Options Management Options This section describes management options for the switch module: • Using the Device Manager, page 1-6 • Using the Command-Line Interface, page 1-7 • Using SNMP, page 1-7 Using the Device Manager The simplest way to manage the switch is by using the device manager that is in the switch memory. This is an easy-to-use web interface that offers quick configuration and monitoring.
Chapter 1 Product Overview Management Options Using the Command-Line Interface The switch CLI) is based on Cisco IOS software and enhanced to support desktop-switching features. You can fully configure and monitor the switch from the CLI. You can access the CLI either by connecting your management station directly to the switch console port or by using Telnet from a remote management station. Refer to the switch module command reference on Cisco.com for more information.
Chapter 1 Product Overview Management Options Cisco Catalyst Blade Switch 3030 Hardware Installation Guide 1-8 OL-8389-01
C H A P T E R 2 Switch Installation This chapter provides instructions on how to install your Cisco Catalyst Blade Switch 3030—also referred to as the switch module—in the Dell Modular Server Chassis and how to set up and configure your switch module. The Dell Modular Server Chassis—also referred to as the server chassis—is a system that supports up to ten server modules and up to four Ethernet switch modules.
Chapter 2 Switch Installation Preparing for Installation Warning To prevent the switch from overheating, do not operate it in an area that exceeds the maximum recommended ambient temperature of 113°F (45°C). To prevent airflow restriction, allow at least 3 inches (7.6 cm) of clearance around the ventilation openings. Statement 17B Warning Before working on equipment that is connected to power lines, remove jewelry (including rings, necklaces, and watches).
Chapter 2 Switch Installation Preparing for Installation Warning For connections outside the building where the equipment is installed, the following ports must be connected through an approved network termination unit with integral circuit protection. 10/100/1000 Ethernet Statement 1044 Warning Invisible laser radiation may be emitted from disconnected fibers or connectors. Do not stare into beams or view directly with optical instruments.
Chapter 2 Switch Installation Preparing for Installation • Operating environment is within the ranges listed in Appendix A, “Technical Specifications.” • Cabling is away from sources of electrical noise, such as radios, power lines, and fluorescent lighting fixtures. Make sure the cabling is safely away from other devices that might damage the cables. • Airflow around the switch and through the vents is unrestricted. • Temperature around the unit does not exceed 113°F (45°C).
Chapter 2 Switch Installation Dell Modular Server Chassis Architecture Dell Modular Server Chassis Architecture The four chassis I/O module bays are on the rear panel (see Figure 2-1). You can insert switch modules into the chassis I/O module bays 1 and 2. Use bays 3 and 4 for switch modules only if a Gigabit Ethernet daughter card is installed on the server modules.
Chapter 2 Switch Installation Installing the Switch Module into the Server Chassis Installing the Switch Module into the Server Chassis For a description of the switch module, see the “Features” section on page 1-1.
Chapter 2 Switch Installation Installing the Switch Module into the Server Chassis Step 8 Push the release latch on the front of the switch module to the closed position. Figure 2-3 shows the switch module being inserted into the server chassis.
Chapter 2 Switch Installation Installing the Switch Module into the Server Chassis Connecting through the Switch Module Console Port This section describes how to connect a PC through the switch module console port to set up the switch. Note To run the system configuration dialog, you must first connect the switch to a PC to run a terminal emulation program. There are two ways you can connect the PC to the switch: either through the switch console port or through the DRAC/MC console port.
Chapter 2 Switch Installation Installing the Switch Module into the Server Chassis Step 3 Step 4 Configure the baud rate and character format of the PC or terminal to match these console port default characteristics: • 9600 baud • 8 data bits • 1 stop bit • No parity • None (flow control) Go to the “Waiting for POST to Complete” section on page 2-11 to finish configuring the switch module.
Chapter 2 Switch Installation Installing the Switch Module into the Server Chassis Step 2 On the PC terminal emulation program: a. Set the data format to 8 data bits, 1 stop bit, and no parity. b. Set the terminal emulation speed to 115200 baud. c. Set Flow Control to none. d. Under Properties, select VT100 for Emulation mode. e. Select Terminal keys for Function, Arrow, and Ctrl keys. Ensure that the setting is for Terminal keys (not Windows keys).
Chapter 2 Switch Installation Installing the Switch Module into the Server Chassis Waiting for POST to Complete Follow these steps: Step 1 Wait for the switch to complete POST. It might take several minutes for the switch to complete POST. Step 2 Verify that POST has completed by confirming that the System Status/ID LED is off and that the Console LED is solid green or amber.
Chapter 2 Switch Installation Installing the Switch Module into the Server Chassis Step 2 Enter a hostname for the switch after the prompt, and press Return. The hostname is limited to 20 characters. Do not use -n, where n is a number, as the last character in a host name for any switch. Step 3 Enter an enable secret password, and press Return. The password can be from 1 to 25 alphanumeric characters, can start with a number, is case sensitive, allows spaces, but ignores leading spaces.
Chapter 2 Switch Installation Installing and Removing SFP Modules interface Vlan1 no shutdown ip address 10.0.0.1 255.255.255.0 ! interface GigabitEthernet0/1 ! interface GigabitEthernet0/2 . . . (output truncated) interface GigabitEthernet0/16 ! end Step 10 These choices appear: [0] Go to the IOS command prompt without saving this config. [1] Return back to the setup without saving this config. [2] Save this configuration to nvram and exit.
Chapter 2 Switch Installation Installing and Removing SFP Modules Installing SFP Modules into SFP Module Slots Figure 2-6 shows an SFP module that has a bale-clasp latch. Caution We strongly recommend that you do not install or remove fiber-optic SFP modules with cables attached because of the potential damage to the cables, the cable connector, or the optical interfaces in the SFP module. Disconnect all cables before removing or installing an SFP module.
Chapter 2 Switch Installation Installing and Removing SFP Modules Removing SFP Modules from SFP Module Slots To remove an SFP module from a module receptacle, follow these steps: Step 1 Attach an ESD-preventive wrist strap to your wrist and to a bare metal surface on the chassis. Step 2 Disconnect the cable from the SFP module. Tip For reattachment, note which cable connector plug is send (TX) and which is receive (RX).
Chapter 2 Switch Installation Connecting to the 10/100/1000 Ports Connecting to the 10/100/1000 Ports The switch 10/100/1000 ports configure themselves to operate at the speed of attached devices. If the attached ports do not support autonegotiation, you can explicitly set the speed and duplex parameters. Connecting devices that do not autonegotiate or that have their speed and duplex parameters manually set can reduce performance or result in no linkage.
Chapter 2 Switch Installation Connecting to SFP Modules The port LED is amber while Spanning Tree Protocol (STP) discovers the topology and searches for loops. This takes about 30 seconds, and then the port LED turns green. If the port LED does not turn on, the device at the other end might not be turned on, or there might be a cable problem or a problem with the adapter installed in the attached device. See Chapter 3, “Troubleshooting,” for solutions to cabling problems.
Chapter 2 Switch Installation Connecting to SFP Modules Figure 2-10 Installing an SFP Module 12x 11x Console 11x 14x 16x 15x 14x 13x 12x 15x 16x 143476 I 13x Step 5 If necessary, reconfigure and restart the switch or target device. Connecting to 1000BASE-T SFP Modules Caution Step 1 To prevent ESD damage, follow your normal board and component handling procedures.
Chapter 2 Switch Installation Where to Go Next The LED turns amber while the STP discovers the network topology and searches for loops. This process takes about 30 seconds, and then the port LED turns green. If the LED is off, the target device might not be turned on, there might be a cable problem, or there might be a problem with the adapter installed in the target device. See Chapter 3, “Troubleshooting,” for solutions to cabling problems.
Chapter 2 Switch Installation Where to Go Next Cisco Catalyst Blade Switch 3030 Hardware Installation Guide 2-20 OL-8389-01
C H A P T E R 3 Troubleshooting The LEDs on the front panel provide troubleshooting information about the switch. They show failures in the power-on self-test (POST), port-connectivity problems, and overall switch performance. For a full description of the switch LEDs, see the “LEDs” section on page 1-4. You can also get statistics from the browser interface, from the command-line interface (CLI), or from a Simple Network Management Protocol (SNMP) workstation.
Chapter 3 Troubleshooting Diagnosing Problems You can access the Technical Support Website (http://www.cisco.
Chapter 3 Troubleshooting Diagnosing Problems Table 3-1 Common Problems and Their Solutions Symptom Possible Cause Resolution Poor performance or excessive errors Duplex autonegotiation mismatch. Refer to the switch software configuration guide for information on identifying autonegotiation mismatches. Cabling distance exceeded • Port statistics show excessive frame check sequence (FCS), late-collision, or alignment errors.
Chapter 3 Troubleshooting Diagnosing Problems Table 3-1 Common Problems and Their Solutions (continued) Symptom Possible Cause No connectivity Incorrect or bad cable Resolution These are results of no link at both ends: • A crossover cable was used when a straight-through was required, or the reverse. • For the correct pinouts and the proper application of crossover or straight-through cables, see the “Two Twisted-Pair Cable Pinouts” section on page B-4. • The cable is wired incorrectly.
Chapter 3 Troubleshooting Diagnosing Problems Table 3-1 Common Problems and Their Solutions (continued) Symptom Possible Cause Resolution Switch does not recognize the SFP module The SFP module might be installed upside down. Verify that the SFP module is not installed upside down. The SFP module does not snap into the slot. Remove the SFP module. Inspect for physical damage to the connector, the module, and the module slot. Replace the SFP module with a known good SFP module.
Chapter 3 Troubleshooting Diagnosing Problems Cisco Catalyst Blade Switch 3030 Hardware Installation Guide 3-6 OL-8389-01
A P P E N D I X A Technical Specifications This appendix lists the switch technical specifications in Table A-1.
Appendix A Technical Specifications Cisco Catalyst Blade Switch 3030 Hardware Installation Guide A-2 OL-8389-01
A P P E N D I X B Connector and Cable Specifications This appendix describes the switch module ports and the cables and adapters that you use to connect the switch to other devices. Connector Specifications These sections describe the connectors used with the switch module. 10/100/1000 Ports The 10/100/1000 Ethernet ports on the switch use standard RJ-45 connectors. Figure B-1 shows the pinout.
Appendix B Connector and Cable Specifications Connector Specifications When connecting the ports to 10BASE-T- and 100BASE-TX-compatible devices, such as switches or repeaters, you can use a two or four twisted-pair, crossover cable. Figure B-5 shows the two twisted-pair, crossover cable schematics. Figure B-7 shows the four twisted-pair, crossover cable schematics. You can use Category 3, 4, or 5 cabling when connecting to 10BASE-T-compatible devices.
Appendix B Connector and Cable Specifications Connector Specifications SFP Module Ports The switch uses SFP modules for fiber-optic and copper uplink ports. Refer to the release notes for a list of supported SFP modules. Fiber-Optic SFP Module LC Connector 58476 Figure B-2 Invisible laser radiation may be emitted from disconnected fibers or connectors. Do not stare into beams or view directly with optical instruments.
Appendix B Connector and Cable Specifications Cable and Adapter Specifications Cable and Adapter Specifications These sections describe the cables and adapters used with the switch. Two Twisted-Pair Cable Pinouts Figure B-4 and Figure B-5 show the schematics of two twisted-pair cables for connecting to 10BASE-Tand 100BASE-TX-compatible devices.
Appendix B Connector and Cable Specifications Cable and Adapter Specifications Four Twisted-Pair Crossover Cable Schematics for 10/100/1000 Ports Switch Switch 1 TPO+ 1 TP0+ 2 TPO- 2 TP0- 3 TP1+ 3 TP1+ 6 TP1- 6 TP1- 4 TP2+ 4 TP2+ 5 TP2- 5 TP2- 7 TP3+ 7 TP3+ 8 TP3- 8 TP3- 65274 Figure B-7 Crossover Cable and Adapter Pinouts This section describes how to identify a crossover cable and also describes the adapter pinouts.
Appendix B Connector and Cable Specifications Cable and Adapter Specifications Adapter Pinouts Table B-1 lists the pinouts for the console port, the RJ-45-to-DB-9 adapter cable, and the console device.
A P P E N D I X C Configuring the Switch with the CLI-Based Setup Program This chapter provides a quick installation and setup procedure for the switch. Note For detailed installation procedures, see Chapter 2, “Switch Installation.” For product overview information, see Chapter 1, “Product Overview.” These steps describe how to do a simple installation: 1. Accessing the CLI Through the Console Port, page C-1 2. Taking Out What You Need, page C-1 3. Connecting to the Console Port, page C-2 4.
Appendix C Configuring the Switch with the CLI-Based Setup Program Accessing the CLI Through the Console Port Note If the switch modules are ordered with the server chassis, the switch modules are already installed, and no unpacking is required. The unpacking procedure applies only if a switch module is ordered separately. Note You need to provide the Category 5 straight-through cables to connect the switch ports to other Ethernet devices.
Appendix C Configuring the Switch with the CLI-Based Setup Program Accessing the CLI Through the Console Port Figure C-1 Console 12x 11x 13x 11x 12x 13x Connecting through the Switch Module Console Port 14x 15x 14x 15x 16x 16x 143844 CON Step 2 Start the terminal emulation session so that you can see the output display from the power-on self-test (POST).
Appendix C Configuring the Switch with the CLI-Based Setup Program Accessing the CLI Through the Console Port Completing the Initial Configuration Follow these steps to complete the setup program and to create an initial configuration for the switch. Note For information about automatically configuring the switch, see the “Assigning the Switch IP Address and Default Gateway” chapter in the switch configuration guide.
Appendix C Configuring the Switch with the CLI-Based Setup Program Accessing the CLI Through the Console Port The IP address and subnet mask shown here are examples: Configuring interface Vlan1: Configure IP on this interface? [yes]: IP address for this interface [10.0.0.1]: Subnet mask for this interface [255.255.255.0] : 255.255.255.0 Class A network is 10.0.0.1, 21 subnet bits; mask is /21 Step 9 Enter no when the prompt asks you if you would like to enable the switch as a cluster command switch.
Appendix C Configuring the Switch with the CLI-Based Setup Program Accessing the CLI Through the Console Port Cisco Catalyst Blade Switch 3030 Hardware Installation Guide C-6 OL-8389-01
I N D EX cabling Numerics 10/100/1000 ports 10/100/1000 ports auto-MDIX 1-3, 2-16 1-3, 2-16, 2-18, B-1, C-2 cable lengths 2-3 pinouts connecting to 2-16 See also connectors and cables connectors and cables description B-1 to B-2 cautions 1-3 illustrated B-4 viii Cisco IOS command-line interface 1-2 Cisco IP Phones, connecting to 1000BASE-T SFP module cable lengths 2-3 Class 1 laser warning CLI 2-16 2-2 1-7, 2-19 accessing through console port A 1-7, 2-19 2-8, C-1 command-lin
Index crossover cable B-5 G connecting to 1000BASE-T SFP module ports connectivity problems 2-18 grounded equipment warning 3-4 2-2 pinout four twisted-pair, 1000BASE-T ports B-5 I installation D See also procedures Dell Remote Access Controller/Modular Chassis installation instructions warning installing SFP module See DRAC/MC 2-2 2-14 device manager description 1-6 how to access J 2-19 diagnosing problems jewelry removal warning 3-2 disposal of product warning document conventio
Index procedures N network configuration examples noise, electrical 1-1 2-4 connection 2-16 to 2-19 installation 2-6 to 2-13 publications, related O xiii R overheating prevention warning 2-2 rear panel description 1-5 release latch location 1-2 removing SFP modules P 2-15 restricted access areas warning packing list RJ-45 connector, console port 2-4 performance problems, solving adapters S B-3 B-5 console port safety B-6, B-6 crossover cable 2-1 server chassis B-5 archit
Index T technical specifications A-1 Telnet, and accessing the CLI temperature, operating temperature monitor 1-7, 2-19 A-1 1-4 trained and qualified personnel warning troubleshooting 2-2 3-1 to 3-4 U using the CLI to manage the switch 1-7, 2-19 W warnings Class 1 laser defined 2-2 viii disposal of product electrical codes 2-2 2-3 Ethernet cable shielding 2-2 Ethernet port connections grounded equipment installation 2-3 2-2 2-1 installation instructions jewelry removal laser radiation