Chapter 6 Switching Concepts

The following sections provide brief explanations of some of the concepts related to switching. If more information is required, please refer to networking textbooks, online resources (i.e. www.oreillynet.com) or your MIS manager.

6.1 Spanning Tree Protocol

The Spanning Tree Protocol (STP) is part of the IEEE 802.1D standard. It provides for a redundant network without the redundant traffic through closed paths. For example, in a network without spanning tree protocol, the same message will be broadcast through multiple paths, which may start an unending packet-passing cycle. This in turn causes a great amount of extra network traffic, leading to network downtime. The STP reduces a network like this, with multiple, redundant connections, to one in which all points are connected, but where there is only one path between any two points (the connections span the entire network, and the paths are branched, like a tree).

6.1.1 How It Works

All of the bridges (a switch is a complex bridge) on the network communicate with each other using special packets of data called Bridge Protocol Data Units (BPDUs). The information exchanged in the BPDUs allows the bridges on the network to do the following:

∙Elect a single bridge to be the root bridge

∙Calculate the shortest path from each bridge to the root bridge

∙Select a designated bridge on each segment, which lies closest to the root and forwards all traffic to it

∙Select a port on each bridge to forward traffic to the root

∙Select the ports on each bridge that forward traffic, and place the redundant ports in blocking states

6.1.2 Spanning Tree Parameters

The operation of the spanning tree algorithm is governed by several parameters. You should attempt to set these parameters only if you have experience with the 802.1D specification. To set the parameters listed below, access the Spanning Tree/Bridge Settings screen (console or telnet), or the Spanning Tree/Bridge Settings page (in the web interface).

Bridge Priority

Setting the Bridge Priority to a low value will increase the likelihood that the current bridge will become the root bridge. If the current bridge is located physically near the center of your network, you may wish to decrease the Bridge Priority from its default value of 32768 to make it become the root bridge. If the current bridge is near the edge of your network, it is best to leave the value of the Bridge Priority at its default setting.

Hello Time

This is the time period between BPDUs transmitted by each bridge. The default setting is 2 seconds.

Maximum Age

Each bridge should receive regular configuration BPDUs from the direction of the root bridge. If the maximum age timer expires before the bridge receives another BPDU, it assumes that a change in the topology has occurred, and it begins recalculating the spanning tree. The default setting for Maximum Age is 20 seconds.

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Asante Technologies 65120 user manual Switching Concepts, Spanning Tree Protocol, How It Works, Spanning Tree Parameters
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65120 specifications

Asante Technologies 65120 is a high-performance network switch specifically designed to meet the needs of modern business environments. It stands out for its advanced features that ensure efficient data management and robust network performance. One of the key characteristics of the 65120 is its ability to support Gigabit Ethernet, which allows for rapid data transfer rates, crucial for businesses that rely on high-speed internet for their operations.

Equipped with 24 ports, the 65120 provides ample connectivity options, allowing businesses to connect multiple devices, including computers, printers, and servers. This extensive port availability ensures that companies can expand their network effortlessly as they grow, without having to invest in additional switches. The switch also features a compact design, making it easy to install in various environments, whether in a server room or an office space.

The 65120 employs advanced technologies that enhance its operational efficiency. One notable feature is its support for VLAN (Virtual Local Area Network) capabilities. VLANs allow network administrators to segment the network into smaller, manageable pieces, improving performance and security by isolating sensitive data traffic from regular network communication. This is particularly beneficial for organizations that handle sensitive customer information or require separate environments for different departments.

Additionally, the switch supports quality of service (QoS) features, which prioritize network traffic to ensure that critical applications receive the bandwidth necessary for smooth operation. This capability is essential for businesses that utilize voice-over IP (VoIP) or video conferencing technologies, where latency can significantly affect communication quality.

Power over Ethernet (PoE) is another significant advantage of the Asante Technologies 65120. This feature allows devices such as IP cameras, wireless access points, and VoIP phones to receive power through the network cable, eliminating the need for additional power sources and simplifying installation processes.

Overall, the Asante Technologies 65120 is a versatile and robust network switch designed for the evolving demands of modern businesses. Its combination of extensive port availability, advanced networking technologies such as VLAN support and QoS, and the convenience of PoE makes it an ideal choice for organizations seeking to enhance their network infrastructure while ensuring scalability and improved performance. This switch not only simplifies network management but also empowers businesses to stay competitive in an increasingly digital landscape.
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