Cisco Systems C3850NM210G Switch Connections, Bad or Damaged Cable, Ethernet and Fiber Cables

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Chapter 6 Troubleshooting

Diagnosing Problems

Switch Connections

Bad or Damaged Cable

Always examine the cable for marginal damage or failure. A cable might be just good enough to connect at the physical layer, but it could corrupt packets as a result of subtle damage to the wiring or connectors. You can identify this situation because the port has many packet errors or the port constantly flaps (loses and regains link).

•Exchange the copper or fiber-optic cable with a known good cable.

•Look for broken or missing pins on cable connectors.

•Rule out any bad patch panel connections or media convertors between the source and destination. If possible, bypass the patch panel or eliminate media convertors (fiber-optic-to-copper).

•Try the cable in another port to see if the problem follows the cable.

•For Catalyst 3850 switch StackWise cable, remove and inspect the cable and StackWise port for bent pins or damaged connectors. If the StackWise cable is bad, replace it with a known good cable.

Ethernet and Fiber Cables

Make sure that you have the correct cable:

•For Ethernet, use Category 3 copper cable for 10 Mbps UTP connections. Use either Category 5, Category 5e, or Category 6 UTP for 10/100 or 10/100/1000 Mbps connections.

•Verify that you have the correct fiber-optic cable for the distance (100 meters or less) and port type. Make sure that the connected device ports match and use the same type encoding, optical frequency, and fiber type. For more information about cabling, see the “SFP and SFP+ Module Cable Specifications” section on page B-5.

•Determine if a copper crossover cable was used when a straight-through was required, or the reverse. Enable auto-MDIX on the switch, or replace the cable. See Table 2-2for recommended Ethernet cables.

Link Status

Verify that both sides have a link. A broken wire or a shut-down port can cause one side to show a link even though the other side does not have a link.

A port LED that is on does not guarantee that the cable is functional. It might have encountered physical stress, causing it to function at a marginal level. If the port LED does not turn on:

•Connect the cable from the switch to a known good device.

•Make sure that both ends of the cable are connected to the correct ports.

•Verify that both devices have power.

•Verify that you are using the correct cable type. See Appendix B, “Connector and Cable Specifications” for more information.

•Look for loose connections. Sometimes a cable appears to be seated but is not. Disconnect the cable and then reconnect it.

Catalyst 3850 Switch Hardware Installation Guide

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Contents Catalyst 3850 Switch Hardware Installation Guide Page N T E N T S Installing and Removing SFP and SFP+ Modules Grounding the Switch Power Supply Module Specifications A-2 Installing the Cisco Microsoft Windows USB Device Driver C-4 Viii Purpose PrefaceDocument Conventions Obtaining Documentation and Submitting a Service Request Related DocumentationSwitch Models, Front Panel, Rear Panel, Management Options, Product OverviewSwitch Models Switch Model Cisco IOS Image DescriptionSwitch Model Cisco IOS Image Description Catalyst 3850-48P-L Switch Front Panel Front Panel10/100/1000 Ethernet Ports PoE, PoE+, and Cisco Upoe PortsManagement Ports USB Mini-Type B PortUSB Type a Port Network ModulesSFP and SFP+ Modules Network Module DescriptionLEDs 3 4 5Color System Status Color XPS StatusPort Mode Port LED Color Meaning Mode LED Port Mode DescriptionPort LEDs and Modes 10/100/1000/SFP ports USB Console LED ColorActv LED Color DescriptionColor Status of PoE mode PoE, PoE+, or Cisco Upoe PoE LEDNetwork Module LEDs Color Network Module Link StatusRJ-45 Console Port LED Rear PanelRJ-45 Console Port Status Power Supply Modules StackWise PortsNumber of Power Models Supplies Available PoE Models Default Power Supply Available PoEPoE Option Port Switch PoE Option Port Switch DC-Power Supply Module LEDs AC-Power Supply Module LEDsFan Modules StackPower Connector Fan Module DescriptionEthernet Management Port Management OptionsRJ-45 Console Port Network Configurations Preparing for Installation Switch InstallationSafety Warnings OL-26779-02 Installation Guidelines Planning a Switch Data Stack Verifying Switch OperationPowering Off the Switch Tools and EquipmentData Stack Cabling Configurations Switch Stacking and Power Stacking GuidelinesData Stack Bandwidth and Partitioning Examples 344185Power-On Sequence for Switch Data Stacks Example of a Data Stack with a Failover ConditionPlanning a StackPower Stack StackPower Stacking GuidelinesStackPower Cabling Configurations Part Number Cable Type LengthStackPower Ring Topology Installing the Switch StackPower Partitioning ExamplesRack-Mounting Attaching the Rack-Mount Brackets 11 Rack-Mounting Brackets12 Attaching Brackets for 19-inch Racks Mounting the Switch in a Rack 13 Mounting the Switch in a RackAfter Installing the Switch Table- or Shelf-MountingConnecting to the StackWise Ports Cisco logo Connector screwConnecting to the StackPower Ports 16 Connecting the StackPower Cable to a StackPower PortInstalling a Network Module in the Switch Installing and Removing SFP and SFP+ ModulesConnecting Devices to the Ethernet Ports 10/100/1000 Ethernet Port ConnectionsPoE+ and Cisco Upoe Port Connections Device Crossover CableWhere to Go Next OL-26779-02 Installing a Network Module OverviewCaptive screws Gigabit Ethernet ports Blank module Captive screws Network Module LEDs Color Link StatusInstalling Network Modules Installing the Network Module in the Switch Configuring a Network Module C3850-NM-4-1G moduleC3850-NM-4-10G module Interface ActionSupported GBICs C3850-NM-2-10G moduleTenGigabitEthernet GigabitEthenet Removing a Network Module Installing SFP and SFP+ ModulesSFP and SFP+ Modules Installing an SFP Module in the Network Module Finding the Network Module Serial Number Removing SFP or SFP+ ModulesNetwork Module Serial Number Location Power Supply Module Overview Power Supply InstallationPart Number Description AC OK LED AC Power Supply Module 6 5 AC Power Supply Module LEDs Installation GuidelinesDC Power Supply Module LEDs Installing or Replacing an AC Power Supply Installing a DC Power Supply Inserting the AC-Power Supply in the SwitchGrounding the Switch Equipment That You NeedStripping the Ground Wire 10 Attaching the Ground Lug and Wire Assembly Installing the DC Power Supply in the Switch Wiring the DC Input Power SourceFinding the Power Supply Module Serial Number 12 DC Source a Isolated From Source B with No Common Ground14 1100-W AC Power Supply Serial Number 16 440-W DC Power Supply Module Serial Number Installing the Fan Fan Module Installation Installing a Fan ModuleInstalling the Fan Module Finding the Fan Module Serial NumberFan Module Serial Number Troubleshooting Diagnosing ProblemsSwitch Post Results Switch LEDsSwitch Connections Bad or Damaged CableEthernet and Fiber Cables Link StatusPoE and PoE+ Port Connections 10/100/1000 Port ConnectionsSFP Modules Switch Performance Interface SettingsPing End Device Spanning Tree LoopsAutonegotiation and Network Interface Cards Resetting the SwitchCabling Distance Finding the Switch Serial Number Replacing a Failed Data Stack MemberTechnical Specifications Switch SpecificationsPhysical Specifications Environmental RangesPower Supply Module Specifications Power SpecificationsPower Specifications Physical Specification Fan Module SpecificationsOperating Specification Connector Specifications Connector and Cable Specifications10/100/1000 Ports Gigabit Ethernet CX1 SFP+ Copper Connectors SFP and SFP+ ModulesFigure B-4 Simplex LC Cable Connector 10/100/1000 Ethernet Management PortConsole Port Figure B-7 10/100 Port PinoutsSFP and SFP+ Module Cable Specifications Cable and Adapter SpecificationsStackWise Cables Four Twisted-Pair Cable Pinouts Two Twisted-Pair Cable PinoutsSwitch Console RJ-45-to-DB-9 Port DTE Identifying a Crossover CableConsole Port Adapter Pinouts DeviceGND Switch Console RJ-45-to-DB-25 Port DTE OL-26779-02 Accessing the CLI Configuring the Switch with the CLI-Based Setup ProgramAccessing the CLI Through Express Setup Accessing the CLI Through a Console Port USB Console Port344194 Installing the Cisco Microsoft Windows USB Device Driver Uninstalling the Cisco Microsoft Windows USB DriverIP Settings Entering the Initial Configuration InformationConfiguring the Setup Program Enter an enable password, and press Return These choices appear OL-26779-02

C3850NM41G, C3850NM210G, WSC385024TS specifications

Cisco Systems is a global leader in networking and telecommunications hardware, and its Catalyst series of switches are widely recognized for their innovation, reliability, and performance. Among the numerous models available, the Cisco WSC385024TS, C3850NM41G, and C3850NM210G stand out for their advanced features and capabilities tailored to meet the needs of modern enterprises.

The Cisco WSC385024TS is a stackable switch that offers 24 ports, and it is built on Cisco's IOS XE software. It is designed for high-density environments, making it ideal for organizations that require robust connectivity and scalability. This model supports advanced Layer 2 and Layer 3 features and facilitates intelligent traffic management through Quality of Service (QoS). One of its standout features is the ability to stack up to nine switches together, enabling centralized management and increased fault tolerance. The WSC385024TS also integrates security features such as 802.1X authentication and access control lists, which are essential for maintaining a secure network infrastructure.

The C3850NM41G is a versatile switch that comes with 41 Gigabit Ethernet ports, making it suitable for environments that demand high-speed connectivity. This model supports Cisco's innovative StackWise-480 technology, which provides increased bandwidth and reliable inter-switch communication. Additionally, it features Power over Ethernet (PoE) capabilities, allowing it to deliver power to connected devices such as IP phones and wireless access points, thereby simplifying cabling and reducing the need for additional power sources. The C3850NM41G is also equipped with built-in automatic fault detection and recovery, enhancing the overall resilience of the network.

Lastly, the C3850NM210G model offers 210 Gbps of switching capacity, making it ideal for data-intensive applications. This switch combines performance with security, supporting various security protocols such as Virtual Routing and Forwarding (VRF) and Dynamic Host Configuration Protocol (DHCP) snooping to protect against malicious activity. With its modular design, the C3850NM210G allows for easy upgrades and expansions, facilitating adaptive network growth.

In summary, the Cisco WSC385024TS, C3850NM41G, and C3850NM210G switches provide advanced features, robust performance, and high scalability, making them ideal choices for businesses aiming to enhance their network infrastructure while supporting cutting-edge technologies. Whether for small businesses or large enterprises, these models exemplify Cisco's commitment to delivering high-quality networking solutions that adapt to the evolving demands of today's digital landscape.
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