Cisco Systems WSC385024TS, C3850NM210G Switch Performance, Interface Settings, Ping End Device

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Chapter 6 Troubleshooting

Diagnosing Problems

Note When ordering or using CX1 cables, ensure that the version identifier is 2 or higher.

•For long wave SFP+ modules, a mode conditioning patch might improve performance over maximum link distances with MMF connections.

Interface Settings

Verify that the port or interface is not disabled or powered off. If a port or interface is manually shut down on either side of the link, it does not come up until you reenable the interface. Use the show interfaces privileged EXEC command to see if the interface is error-disabled, disabled, or shut down on either side of the connection. If needed, reenable the interface.

Ping End Device

Ping from the directly connected switch first, and then work your way back port by port, interface by interface, trunk by trunk, until you find the source of the connectivity issue. Make sure that each switch can identify the end device MAC address in its Content-Addressable Memory (CAM) table.

Spanning Tree Loops

STP loops can cause serious performance issues that look like port or interface problems.

A unidirectional link can cause loops. It occurs when the traffic sent by the switch is received by the neighbor, but the traffic from the neighbor is not received by the switch. A broken cable, other cabling problems, or a port issue could cause this one-way communication.

You can enable UniDirectional Link Detection (UDLD) on the switch to help identify unidirectional link problems. For information about enabling UDLD on the switch, see the “Understanding UDLD” section in the software configuration guide on Cisco.com.

Switch Performance

Speed, Duplex, and Autonegotiation

Port statistics that show a large amount of alignment errors, frame check sequence (FCS), or late-collisions errors, might mean a speed or duplex mismatch.

A common issue occurs when duplex and speed settings are mismatched between two switches, between a switch and a router, or between the switch and a workstation or server. Mismatches can happen when manually setting the speed and duplex or from autonegotiation issues between the two devices.

To maximize switch performance and to ensure a link, follow one of these guidelines when changing the duplex or the speed settings:

•Let both ports autonegotiate both speed and duplex.

•Manually set the speed and duplex parameters for the interfaces on both ends of the connection.

•If a remote device does not autonegotiate, use the same duplex settings on the two ports. The speed parameter adjusts itself even if the connected port does not autonegotiate.

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 Preface PurposeDocument 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 StatusMode LED Port Mode Description Port Mode Port LED Color MeaningPort 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 StatusRear Panel RJ-45 Console Port LEDRJ-45 Console Port Status Power Supply Modules StackWise PortsModels Default Power Supply Available PoE Number of Power Models Supplies Available PoEPoE Option Port Switch PoE Option Port Switch AC-Power Supply Module LEDs DC-Power Supply Module LEDsFan Modules StackPower Connector Fan Module DescriptionManagement Options Ethernet Management PortRJ-45 Console Port Network Configurations Switch Installation Preparing for InstallationSafety Warnings OL-26779-02 Installation Guidelines Powering Off the Switch Planning a Switch Data StackVerifying Switch Operation 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 PortConnecting Devices to the Ethernet Ports Installing a Network Module in the SwitchInstalling and Removing SFP and SFP+ Modules 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 C3850-NM-4-10G module Configuring a Network ModuleC3850-NM-4-1G module Interface ActionC3850-NM-2-10G module Supported GBICsTenGigabitEthernet GigabitEthenet Installing SFP and SFP+ Modules Removing a Network ModuleSFP 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 Installation Power Supply Module OverviewPart Number Description AC OK LED AC Power Supply Module 6 5 Installation Guidelines AC Power Supply Module LEDsDC 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 Switch Post Results TroubleshootingDiagnosing Problems Switch LEDsEthernet and Fiber Cables Switch ConnectionsBad or Damaged Cable Link Status10/100/1000 Port Connections PoE and PoE+ Port ConnectionsSFP Modules Ping End Device Switch PerformanceInterface Settings Spanning Tree LoopsResetting the Switch Autonegotiation and Network Interface CardsCabling Distance Finding the Switch Serial Number Replacing a Failed Data Stack MemberPhysical Specifications Technical SpecificationsSwitch Specifications Environmental RangesPower Supply Module Specifications Power SpecificationsPower Specifications Fan Module Specifications Physical SpecificationOperating Specification Connector and Cable Specifications Connector 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 PinoutsCable and Adapter Specifications SFP and SFP+ Module Cable SpecificationsStackWise Cables Four Twisted-Pair Cable Pinouts Two Twisted-Pair Cable PinoutsConsole Port Adapter Pinouts Switch Console RJ-45-to-DB-9 Port DTEIdentifying a Crossover Cable DeviceGND Switch Console RJ-45-to-DB-25 Port DTE OL-26779-02 Configuring the Switch with the CLI-Based Setup Program Accessing the CLIAccessing 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 DriverEntering the Initial Configuration Information IP SettingsConfiguring 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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