SMC Networks SMC8950EM, SMC8926EM manual Stack Troubleshooting

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Stack Troubleshooting A

Stack Troubleshooting

If a stack fails to initialize or function, first check the following items:

•Check that all stacking cables are properly connected.

•Check if any stacking cables appear damaged.

•Check that only one Stack Master button is pressed in.

•Check that all switches in the stack are powered on.

After checking all items, reboot all the switches in the stack.

Switches in the stack may be configured using a ring- or line-topology. To ensure minimal disruption in case a unit or stacking cable fails, always use a ring-topology. When using ring-topology configuration and a switch fails, or a stacking cable is disconnected, the stack continues normal operation using line-topology stacking through the remaining stack connections.

If any changes occur to a slave unit, such as unit failure or insertion of a new unit, operation of the other units in the stack are not affected. On the other hand, if the master unit fails, the unit with the lowest MAC address is elected as the new master. The stack reboots, discovers the new stack topology, assigns identifiers to each unit, and checks the software images on each unit. This process make take up to two minutes.

If you do not connect a wrap-around cable from the bottom unit back up to the top unit in the stack, the failure of a single unit will cause the stack to break into two separate stacks. In this case, a master unit will be elected for both of the stacks. However, backup information inherited from the previous master unit will cause the same IP address to be used by both master units in the two stacks. You must therefore manually reconfigure the IP address of the management interface on one of the master units.

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Contents Installation Guide TigerStack II 10/100/1000 Installation Guide Page Warranty and Product Registration Compliances and Safety Warnings CE Mark Declaration of Conformance for EMI and Safety EEC Safety Compliance Power Cord SafetyPower Cord Set France et Pérou uniquement Environmental Statement Documentation About This Guide Contents Making Network Connections Glossary Index Tables Figures Figures Overview IntroductionNetwork Management Options Switch ArchitectureIntroduction Speed Port Status LEDsCondition Status Link Activity On/Flashing GreenPower Supply Sockets Optional Redundant Power SupplyConnectivity Features and BenefitsOptional Media Extender Modules Extender Module LEDsPerformance ExpandabilityManagement Introduction Network Planning Introduction to SwitchingCollapsed Backbone Application ExamplesNetwork Aggregation Plan Network Aggregation PlanRemote Connections with Fiber Cable Remote Connections with Fiber CableMaking Vlan Connections Making Vlan ConnectionsUsing Layer 3 Routing Application Notes Network Planning Selecting a Site Installing the SwitchEthernet Cabling Package Contents Equipment ChecklistOptional Rack-Mounting Equipment Rack Mounting MountingDesktop or Shelf Mounting Installing the Switch in a RackInstalling an Optional Module Installing an Optional Module into the SwitchInserting an SFP Transceiver into a Slot Installing an Optional SFP TransceiverMaking Stacking Connections Connecting Switches in a StackStacking Topologies Connecting to a Power SourceWiring Map for Serial Cable Connecting to the Console PortSerial Cable Wiring Switch’s 8-Pin Null Modem PC’s 9-Pin Installing the Switch Cabling Guidelines Connecting Network DevicesMaking Network Connections Twisted-Pair DevicesNetwork Wiring Connections Connecting to PCs, Servers, Hubs and SwitchesFiber Optic SFP Devices Network Wiring ConnectionsMaking Connections to SFP Transceivers Gbps Fiber Optic ConnectionsConnecting to an XFP Transceiver 1000BASE-T Cable Requirements Connectivity RulesGbps Ethernet Collision Domain Mbps Fast Ethernet Collision Domain Mbps Gigabit Ethernet Collision DomainMbps Ethernet Collision Domain Cable Labeling and Connection Records Diagnosing Switch Indicators Appendix a TroubleshootingInstallation Power and Cooling ProblemsIn-Band Access Stack Troubleshooting Troubleshooting Twisted-Pair Cable and Pin Assignments Appendix B Cables10BASE-T/100BASE-TX Pin Assignments Crossover Wiring Straight-Through Wiring1000BASE-T Pin Assignments Figure B-3 Crossover WiringAdjusting Existing Category 5 Cabling to Run 1000BASE-T Cable Testing for Existing Category 5 CableFiber Standards Nm Loss-Minimized Dispersion-Shifted FiberNon-Zero Dispersion-Shifted Cables Physical Characteristics Appendix C SpecificationsPower Consumption WeightTemperature Power SupplyManagement Features Switch FeaturesStandards Extender Modules Compliances10BASE-T GlossaryCSMA/CD Ieee TIA Numerics IndexIndex-2 Index-3 Index Index-4 Page 150200000054A R01

SMC8926EM, SMC8950EM specifications

SMC Networks has established itself as a prominent player in the networking and connectivity market, offering a range of professional solutions designed for small to medium-sized enterprises. Among its notable products are the SMC8950EM and the SMC8926EM, two advanced Ethernet switches that cater to the need for reliable and efficient networking.

The SMC8950EM is an enterprise-class managed switch that delivers high-performance capability with 48 10/100/1000Mbps Ethernet ports, providing extensive connectivity for various devices on a local area network. Its architecture is designed to handle high traffic loads, making it apt for environments where speed and reliability are paramount. This switch supports multiple protocols, including VLANs, which allow for flexible network segmentation and improved security. The SMC8950EM also features several Layer 2 and Layer 3 management protocols, enabling the switch to support advanced routing, Quality of Service (QoS), and network traffic management.

On the other hand, the SMC8926EM is a compact yet powerful switch equipped with 24 10/100/1000Mbps Ethernet ports, making it ideal for smaller installations or branch offices that require scalability without compromising on performance. With support for Power over Ethernet (PoE), the SMC8926EM simplifies the implementation of IP phones, security cameras, and wireless access points, making it particularly useful in environments where power outlets may be limited.

Both models employ advanced technologies, such as network storm control and link aggregation, to enhance performance and ensure seamless connectivity. They also provide comprehensive network monitoring capabilities, allowing administrators to manage traffic and troubleshoot issues proactively. The user-friendly web interface facilitates easier management and configuration, while SNMP support enables integration with existing network management systems for enhanced visibility and control.

Ultimately, the SMC8950EM and SMC8926EM represent robust networking solutions that address the challenges faced by modern enterprises. With their combination of high performance, advanced features, and scalability, these switches are well-suited for companies looking to build a reliable and efficient network infrastructure. Whether for a large organization or a small branch office, SMC Networks continues to deliver products that meet the evolving needs of users worldwide.
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