Incoming LLC2 traffic that is destined for a terminated MAC address will be for- warded to the node's internal LLC2 processes. Non-terminated LLC2 frames and all other frames will be forwarded to the bridge.

Under the spanning tree concept, bridges automatically maintain forwarding tables via exchange of messages with other bridges on the network, and determination of single paths for traffic between endpoints (assuming there are multiple possible paths).

Each Bridge is identified by a Bridge ID, which is made up of a two-octet Bridge Pri- ority—configured in Bridge Node Defaults —followed by a unique 48-bit ID (which is created automatically by the software).

Bridging is supported on Ethernet, Token Ring, and frame relay interfaces.

The interfaces used for Bridging in the SmartSwitch 1800 are the same as those used for LLC2. When referring to Bridging, however, these inter- faces will be called "Bridge ports," since the IEEE 802.1d standard uses the term "port" to identify a connection to a bridge.

Avoid configuring parallel Bridge/LLC2 frame relay links between two FRMs if one path is in native LLC2 format and the other in some other format. Since native LLC2 interfaces do not support the spanning tree protocol, a loop can be created, causing a node failure.

Required Configuration

To configure a Bridge in a SmartSwitch 1800, make sure the following are properly configured:

●Node parameters (Chapter 4). This is general configuration that must be done no matter which protocols will be run in the node.

●Loaded protocols (Chapter 5): Bridging and frame relay.

●LAN port (page 6-5) that will connect to a Local Area Network.

●Frame relay (Chapter 7) port(s) that will connect to a network and/or frame relay PVC.

●Bridge parameters, described later in this chapter.

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1800 specifications

Cabletron Systems, a leading player in network management and telecommunications solutions during the late 20th century, introduced several innovative products that played a crucial role in shaping enterprise networking. Among these were the Cabletron FRX6000, FRX4000, and the FRX1800, which delivered advanced features aimed at enhancing network performance, security, and scalability.

The Cabletron FRX6000 was designed as a robust multi-layer switch, ideal for large-scale enterprise environments. It supported extensive routing capabilities, allowing organizations to manage traffic efficiently even under heavy loads. The FRX6000 boasted high throughput rates and low latency, making it suitable for demanding applications. With support for various network protocols, including IP, IPX, and AppleTalk, its adaptability made it a versatile choice for diverse networking needs. Moreover, security features like VLAN support and Access Control Lists (ACLs) provided enhanced protection against potential threats.

Moving to the FRX4000, this model offered a balance between performance and cost-effectiveness. The FRX4000 maintained many of the essential features of its larger counterpart while catering to medium-sized enterprises. It provided Layer 3 routing and could handle multiple simultaneous connections, ensuring seamless communication across departments. The modular design allowed for easy upgrades, enabling businesses to expand their network infrastructure without significant overhauls. This made the FRX4000 an attractive option for organizations looking to optimize their network investments.

Lastly, the FRX1800, designed for small to medium businesses, focused on simplicity and ease of use while still incorporating powerful network management capabilities. Its user-friendly interface made it accessible for organizations lacking extensive IT resources. The FRX1800 provided essential functionalities such as Integrated Layer 2 switching and routing, network monitoring, and basic security features, ensuring that even smaller companies could maintain efficient, reliable networking without overwhelming complexity.

All three models utilized advanced technologies, including a high bandwidth backbone and state-of-the-art switching architecture, to enable fast and reliable data transfer. They also supported Quality of Service (QoS) mechanisms, allowing businesses to prioritize critical applications and ensure consistent performance across the network.

In summary, the Cabletron FRX6000, FRX4000, and FRX1800 were pivotal in enhancing network capabilities, providing organizations with scalable, secure, and high-performance options tailored to their specific needs.
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