NB-30 Bridging

Entries to the Source Address Table are one of four types: Permanent, Static, Dynamic, or Learned.

¥Permanent entries are addresses that you add to the Static Database (via the Filtering Database window) that are stored in the deviceÕs battery-backed RAM. Since they remain in the device on shutdown or restart, they are considered ÒPermanent.Ó

¥Static entries are addresses that you add to the Static Database (via the Filtering Database window). These entries remain in the device until it is shut down.

¥Dynamic entries are addresses that you add to the Static Database (via the Filtering Database window). With the Aging Time feature, you set the time period that these addresses are saved in the Source Address Table. Addresses that have not transmitted a packet during one complete cycle of the aging timer are deleted from the database.

¥Learned entries are addresses that are added to the Learned Database through the bridgeÕs learning process. With the Aging Time feature, you set the time period that these addresses are saved in the Source Address Table. Addresses which are inactive within a cycle of the aging timer are dropped from the database.

Learned address entries are divided into two types, Learned and Self. Address entries classiÞed as Learned have transmitted frames destined for a device attached to a device portÕs connected segment. Address entries classiÞed as Self are those that have sent a frame with a destination address of one of the deviceÕs bridging ports.

At the Filtering Database window (Figure 3-7,page 3-26),you can view the number of entries of each type: Permanent, Static, Dynamic, or Learned.

A scrollable Address Entry panel allows you to:

¥View the address entries in the Filtering Database.

¥Alter an entryÕs type (e.g., from Learned to Permanent, Dynamic, or Static).

¥View and conÞgure the bridging action taking place on the packets entering each of the bridging ports.

In addition, you can use buttons to add individual addresses to, or delete them from, these databases, or clear all Permanent, Static, or Dynamic entries in the database.

To access the Filtering Database window:

1.From the Bridge Status window, click on Bridge to display the Bridge menu.

2.Drag down to select Filtering Database. The Filtering Database window, Figure 3-7, will appear.

Filtering Database

3-25

Page 50 Page 52
Page 51
Image 51
Cabletron Systems NB30 manual NB-30 Bridging
Page 50 Page 52

NB30 specifications

Cabletron Systems NB30 is a noteworthy networking device that emerged in the mid-1990s as a critical component for businesses looking to enhance their local area network (LAN) capabilities. Designed primarily for the burgeoning demand of network speed and reliability, the NB30 served as a bridge in networking technology, offering organizations a robust solution to keep up with the advancing digital landscape.

One of the main features of the Cabletron NB30 is its ability to support both Ethernet and Token Ring protocols. This dual compatibility made it an attractive choice for enterprises that were transitioning from older networking systems to newer infrastructures. By accommodating both technologies, the NB30 enabled smoother migrations without necessitating a complete overhaul of existing networking components.

Another significant characteristic of the NB30 is its modular architecture. This design allowed organizations to customize their networking setup according to specific needs and preferences. Users could add or replace modules to enhance functionality, from extra ports to support additional devices or advanced features like network management tools, ensuring that their systems could grow and evolve in tandem with their business requirements.

The NB30 also utilized a stackable design, which facilitated scalability. Organizations could easily connect multiple NB30 units to increase their network capacity and performance. This stacking capability was a significant advantage as it allowed for efficient use of space and resources while providing a path for future growth.

In terms of performance, the Cabletron NB30 boasted a switching capacity that enabled quick data transfer rates, reducing latency and improving overall network responsiveness. This speed was crucial during a period when businesses were increasingly reliant on real-time data exchange and communication.

Additionally, the NB30 incorporated advanced network management features, enabling administrators to monitor traffic, diagnose issues, and implement changes with ease. This level of control was essential for maintaining network health, ensuring that businesses remained operational without unnecessary downtimes.

Overall, Cabletron Systems NB30 played a pivotal role in the evolution of networking technology. Its combination of protocol flexibility, modular design, scalability, and robust performance made it a popular choice for businesses looking to create efficient, dependable networks in an era of rapid technological advancement. The NB30's legacy continues to influence modern networking solutions, demonstrating the importance of adaptability and performance in the ever-changing digital world.
Top Page Image Contents