Using the TSX-1620 Bridge View

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CAUTION

The Spanning Tree Protocol window displays the following information:

Spanning Tree Version

The version shows the Spanning Tree Protocol type employed by this bridge:

•IEEE 802.1d

•DEC LAN 100

•None

You must use either 802.1d or DEC to interconnect all bridges in a network using parallel bridges. By default, a Cabletron bridge turns on the 802.1d Spanning Tree. All of Cabletron’s bridge products have the ability to use either the 802.1d or DEC Spanning Tree version, or they can be set so that no version is in effect. (A bridge should be set to None if there are no redundant loops incorporated within the network.)

All bridges in a network must use the same Spanning Tree version. Mixing Spanning Tree Algorithm protocols will cause an unstable network.

Designated Root

This value represents the bridge that is the current Root Bridge as determined by the STA. The Designated Root value consists of the configurable portion of the bridge ID (i.e., the first two octets of the eight-octet-long bridge ID) and the TSX- 1620’s MAC address (the last six octets of the bridge ID). This value is used as the Root Identifier parameter in all configuration BPDUs originated from this node.

Num. Topology Chgs.

Indicates the number of times the bridge’s Topology Change flag has been changed since the bridge was powered up or initialized. The Topology Change flag increments each time any of the network’s bridges enters or leaves the network or when the Root Bridge ID changes.

The values for the following three fields—Forward Delay, Max Age, and Hello Time—represent the values that are currently being used by all bridges, as dictated by the Root bridge. In the Spanning Tree Protocol window, you can view and set the values—Root Forward Delay, Root Max Age, Root Hello Time—that will be in effect when the bridge for which you are setting the parameters becomes the Root Bridge.

Forward Delay

The length of time, in seconds, that controls how long a bridge port remains in each state (Forwarding, Learning, Listening, etc.) when moving toward the Forwarding state. During a topology change, the Forward Delay is also used as the Filtering Database Ageing Time, which ensures that the Filtering Database will contain current topology information. The Root Bridge sets the Forward Delay.

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The Spanning Tree Protocol Window

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Cabletron Systems TSX-1620 manual Spanning Tree Version, Designated Root, Num. Topology Chgs, Forward Delay
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TSX-1620 specifications

The Cabletron Systems TSX-1620 is a pioneering piece of network hardware that played a significant role in the evolution of networking technologies during the 1990s. This well-engineered device is primarily recognized as a multi-port Ethernet switch that was designed to provide high-speed, reliable connectivity for local area networks (LANs). As organizations increasingly demanded robust performance and enhanced network capabilities, the TSX-1620 emerged as a powerful solution to address these needs.

One of the key features of the TSX-1620 is its support for both 10Base-T and 100Base-T standards, catering to both standard Ethernet and Fast Ethernet connections. This versatility allowed businesses to easily transition from older Ethernet systems to newer, faster specifications without replacing their entire infrastructure. The switch could intelligently manage traffic between devices, minimizing collisions and ensuring that data packets were transmitted efficiently.

The architecture of the TSX-1620 includes support for various advanced technologies that enhance network performance. Its store-and-forward switching capability improves data integrity by checking packets for errors before forwarding them to their destination. This process reduces the risk of corrupted data affecting network performance, making it especially valuable for mission-critical applications.

Another notable feature is its robust security tools. The TSX-1620 incorporates VLAN (Virtual Local Area Network) support, enabling network administrators to segment traffic and improve security across different departments or user groups. This not only mitigates the risk associated with unauthorized access but also optimizes network traffic by confining broadcasts to designated VLANs.

Scalability is a prominent characteristic of the TSX-1620. With ports available for expansion, organizations could easily increase their network capacity as their needs grew. This feature promoted long-term investment in network infrastructure, allowing businesses to adapt quickly to changing demands without incurring substantial costs.

Reliability is paramount in networking equipment, and the TSX-1620 does not disappoint. Engineered with high-quality components, this switch was built to operate efficiently in a variety of environments while maintaining stable performance. Its design ensures a cooling mechanism that minimizes overheating, thereby prolonging its operational lifespan.

In summary, the Cabletron Systems TSX-1620 represents a significant advancement in network switch technology during its era. Its combination of speed, versatility, security features, and robust architecture made it a valuable asset for organizations seeking to enhance their networking capabilities and prepare for the future.
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