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Spanning Tree

This chapter describes how to configure the Spanning Tree Protocol (STP) on the switch.

It includes the following topics:

•Overview of Spanning Tree

•Configuring STP Status and Global Settings

•Configuring STP Interface Settings

•RSTP Interface Settings

Overview of Spanning Tree

STP enables efficient communication on a network that includes multiple bridges. Devices on these networks can learn multiple (that is, redundant) paths to the same endpoint. While path redundancy is desirable for maintaining traffic flow when particular links are down, it can lead to a traffic loops that affect network performance and confuse forwarding algorithms.

Each STP-enabled bridge exchanges Bridge Protocol Data Units (BPDUs) with other bridges. BPDUs identify the bridge port MAC addresses and the priority and cost associated with each port. STP uses this information to build a topology that provides one active path between any two stations on the network. Duplicate paths between those stations are placed in a stand-by state for use only when the active path becomes unavailable.

BPDU exchanges also facilitate the election of a root bridge and root port for the network. The root bridge provides a reference point that each other bridge uses to calculate a lowest-cost path by summing the cost of the ports in each path and choosing the one with the lowest total. The port that connects a bridge to the lowest-cost path is called the bridge’s root port.

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SLM2008PTNA specifications

Cisco Systems SLM2008PTNA is a robust network switch designed specifically for small to medium-sized businesses. It operates with 8 Fast Ethernet ports, providing advanced features and best-in-class performance to enhance your network infrastructure. This model ensures seamless connectivity for multiple devices, making it an ideal choice for environments requiring reliable network communication.

One of the standout features of the SLM2008PTNA is its Layer 2 switching capabilities. This switch supports auto-negotiation, which allows each port to automatically detect the speed of the connected device and adjust accordingly. This ensures optimal performance and smooth operation across various connected devices. Additionally, the switch supports a non-blocking architecture, ensuring that bandwidth is not shared, which significantly enhances data transmission speed.

Power over Ethernet (PoE) is another key technology incorporated into the Cisco SLM2008PTNA. It simplifies the installation of network devices such as VoIP phones, security cameras, and wireless access points by supplying power through the Ethernet cable. This eliminates the need for separate power sources, reducing installation costs and increasing flexibility in device placement.

Moreover, the SLM2008PTNA comes equipped with advanced security features, such as port security and VLAN support. Port security allows network administrators to restrict access to the network based on MAC addresses, preventing unauthorized access and enhancing network security. The support for Virtual Local Area Networks (VLANs) enables the segmentation of the network into different logical networks, improving traffic management and security within each segment.

The switch is designed for easy management and monitoring, featuring a user-friendly web interface that simplifies configuration. This allows network administrators to quickly set up and manage the device without requiring extensive technical knowledge. Additionally, its compact design makes it suitable for desktop or rack-mount installation, maximizing space efficiency in network environments.

In conclusion, the Cisco Systems SLM2008PTNA is an essential component for small to medium-sized businesses looking to enhance their network performance. With its Layer 2 switching capabilities, Power over Ethernet support, advanced security features, and ease of management, this switch provides a well-rounded solution for modern networking needs, delivering reliable performance and scalability for growth.
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