Cabletron Systems NB20E, NB25 E Primary and Redundant Data Paths, Multiple Bridging Environments

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INTRODUCTION

1.5.2Primary and Redundant Data Paths

To ensure the integrity of the network, primary data paths through designated bridges, and redundant data paths through alternative bridges are determined in each LAN or loop configuration in the network. A LAN segment’s designated bridge is the bridge in a LAN or loop configuration with the lowest cost path of transmission from that LAN segment to the root bridge. The lowest cost path can be translated in a general way to mean the data transmission path to the root that is most economical.

The bridges in the network send out BPDUs to the other bridges so that they can all learn which is the bridge in the network, or in a potential loop configuration, with the lowest cost path to the root. The bridges can then determine their own priorities and roles as designated or redundant bridges. Redundant bridges are “blocked” from forwarding packets, but they continue to receive topology information.

Figure 1-2 provides a sample illustration of how a potential data loop is prevented in a simple multibridge environment. A data loop exists

NODE A

T

T

BRIDGE 1

NB20E OR 25E

T

T

NB20E OR 25E

BRIDGE 2

NB20E OR 25E

BRIDGE 3

T

T

NODE B

Figure 1-2 Multiple Bridging Environments

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Contents TWO Port Ethernet Bridges USER’S Manual Page Page FCC Notice Contents Contents Using this Manual Chapter IntroductionGetting Help NB20E and NB25E TWO Port Ethernet BridgeBridge Filtering Method Provides an illustration of the filtering processBridging Method Multiple Bridge Environments Root BridgePrimary and Redundant Data Paths Multiple Bridging EnvironmentsRemote Lanview Related Manuals Chapter Installation Requirements Specifications Location RequirementsNetwork Requirements Operating Specifications GeneralNB20E NB25E PerformanceFront Panel Indicators Front Panel SwitchesAUI Port NB20E/NB25E RS232 PortPower Supply Requirements Environmental RequirementsSafety ServicePhysical Properties Chapter Installing the NB20E or NB25E Bridge Installing the BridgeUnpacking the NB20E or NB25E Bridge Installing the Rack Mount Brackets Rack Mount Brackets InstallationCable Support Installation Connecting The Bridge To The NetworkSetting The Mode Switches InstallationConnecting The NB20E or NB25E To The Power Source NB-25EInstalling the NB20E or NB25E Bridge Chapter Testing and Lanview Installation CHECK-OUTUsing Lanview Check Out ConfigurationUsing the Forward Broadcast Switch Using the Root Switch

NB25 E, NB20E specifications

Cabletron Systems, renowned for its innovative networking solutions in the late 20th century, introduced the NB20E and NB25E series, which made a significant impact in the realm of network management and reliability. These devices were tailored for businesses seeking to enhance their network infrastructure with efficiency and reliability.

The NB20E is known for its robust performance in medium-sized network environments. It operates with an architecture that allows for seamless integration into existing networks, providing essential features that cater to both versatility and scalability. One of its standout functionalities is the support for multiple protocols, enabling organizations to harness various networking standards without the need for extensive alterations to their current setups.

On the other hand, the NB25E extends these capabilities further, offering enhanced throughput and a more comprehensive range of networking options. This makes it particularly suitable for larger businesses with growing networking demands. The utilization of advanced technologies, such as its embedded intelligence, ensures that the NB25E can efficiently manage and direct network traffic, thus minimizing latency and maintaining optimal performance even during peak usage times.

Both models provide essential characteristics such as a modular design, allowing for easy upgrades and maintenance. This modularity not only prolongs the lifespan of the devices but also provides flexibility for future expansions or modifications as business needs evolve. The systems support various interfaces, catering to diverse environments and ensuring easy connectivity to other networking equipment.

Security is a paramount concern in today’s interconnected world, and Cabletron Systems addressed this in the NB20E and NB25E series. The devices are equipped with advanced security features that protect against unauthorized access and ensure data integrity, providing peace of mind for organizations relying on critical data transmissions.

In addition to their technical advantages, both models offer user-friendly management software, making monitoring and control straightforward even for those with limited networking expertise. This ease of use ensures that companies can leverage their investment fully without requiring extensive training or resources.

In summary, the Cabletron Systems NB20E and NB25E series represent a significant leap in networking technology during their era. With advanced features, modular capabilities, and a commitment to security, these devices remain a noteworthy consideration for businesses looking to enhance their networks and prepare for future growth.
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