Chapter 5

Bridging

Bridge management overview; the Bridge Status window; bridge Performance Graphs; changing bridge Spanning Tree parameters; configuring the Filtering Database; setting duplex modes; using the port Source Addressing window

Bridging Basics

When configured to operate as a traditional switch, your 9H42x-xx Fast Ethernet SmartSwitch modules have the ability to act as 802.1d Transparent Bridges to direct traffic between the network segments connected to their front panel and the interface to the INB backplane.

Bridges are used in local area networks to connect two or more network segments and to control the flow of packets between the segments. Ideally, bridges forward packets to another network segment only when necessary.

Bridges are also used to increase the fault tolerance in a local area network by creating redundant bridge paths between network segments. In the event of a bridge or bridge segment failure, an alternate bridge path will be available to network traffic, without significant interruption to its flow.

The method a bridge uses to forward packets, choose a bridge path, and ensure that a sending station’s messages take only one bridge path depends on the bridge’s type: Transparent (generally used in Ethernet or FDDI environments) or Source Routing (generally used in Token Ring environments).

Transparent bridging relies on a “Filtering Database” to make forwarding decisions. The source addresses of data coming into each bridge interface are read and stored in a Filtering Database that associates each address with the interface it was detected on. When a packet is received by the bridge, it can then compare the destination address of the packet to the addresses in the Filtering Database, and determine which bridge interface to send the packet to.

In Source Route bridging, the source node sends “explorer” packets to a destination node that pass through a bridged network. Each bridge that sees the explorer packet will append Routing Information (in the form of LAN segment numbers) to it. When the destination node receives these explorer packets, it will

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Cabletron Systems 9H42X-XX manual Bridging Basics
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9H42X-XX specifications

Cabletron Systems 9H42X-XX is an advanced networking device recognized for its robust performance and reliability in various enterprise environments. Designed to meet the growing demands of data communication, this model serves as a vital component of network infrastructure, offering a myriad of features and technologies.

One of the standout characteristics of the 9H42X-XX is its high-speed data processing capabilities. Equipped with multiple Gigabit Ethernet ports, it ensures rapid data transfer rates, making it ideal for bandwidth-intensive applications. This model supports both IPv4 and IPv6 addressing, ensuring compatibility with modern networking standards and future-proofing the investment for organizations transitioning to newer technologies.

The 9H42X-XX excels in flexibility and scalability, accommodating a range of networking topologies. Its modular design allows for the addition of different interface cards, catering to specific networking requirements such as VoIP, video streaming, and cloud services. This adaptiveness is crucial for organizations that must optimize their network as needs evolve over time.

Security is a primary consideration in the design of the 9H42X-XX. With built-in firewall capabilities and support for advanced encryption protocols, data integrity and confidentiality are ensured. Furthermore, the device offers robust access control features, allowing organizations to define user permissions and protect sensitive information from unauthorized access.

Another important feature is the comprehensive management options available with the 9H42X-XX. It provides a user-friendly interface for network administrators to monitor traffic, configure settings, and troubleshoot issues. This ease of management contributes to reduced downtimes and better overall network efficiency.

Additionally, the Cabletron Systems 9H42X-XX is known for its durability and performance consistency in varying environmental conditions. This resilience makes it suitable for both indoor and outdoor deployments, further extending its usability across different types of organizations.

In summary, the Cabletron Systems 9H42X-XX is a versatile networking solution that combines high-speed connectivity, security features, and ease of management within its robust architecture. Its adaptability and technical specifications position it as a reliable choice for enterprises looking to upgrade their network infrastructure and accommodate future growth.
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