Cabletron Systems NB30 manual Bridge Spanning Tree Window

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NB-30 Bridging

In Transparent bridging, Spanning Tree must be used to prevent data loops (since in an Ethernet environment, a packet propagated down multiple paths would cause higher volumes of trafÞc and collisions that would cripple a network that relied on carrier sense and collision detection).

In a network designed with multiple bridges placed in parallel, Spanning Tree selects a controlling Root Bridge and Port for the entire bridged local area network, and a Designated Bridge and Port for each individual network segment. The Root bridge is the one that selects one of two or more available bridge paths between two end stations, basing its decision on factors associated with each of the bridges in the path. A Designated Port/Bridge for a network segment relays frames toward the Root Bridge, or from the Root Bridge onto the network segment. When data passes from one end station to another across a bridged local area network, it is forwarded through the Designated Bridge/Port for each network segment towards the Root Bridge, which in turn forwards frames towards Designated Bridges/Ports on its opposite side.

During the Root Bridge selection process, all bridges on the network communicate STA information via Bridge Protocol Data Units (BPDUs). It is with BPDUs that the bridges collectively determine the current network topology and ensure that all bridges have current topology information.

To access the Bridge Spanning Tree window:

1.From the NB-30 Bridge Status window, click on Bridge. The Bridge menu will appear.

2.Click on Spanning Tree.... The Bridge Spanning Tree window, Figure 3-6, will appear.

Figure 3-6. Bridge Spanning Tree Window

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Bridge Spanning Tree

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Contents NB30 User’s Guide Page Virus Disclaimer Page Restricted Rights Notice Page Contents Contents IndexUsing the NB-30 Bridge User’s Guide IntroductionRelated Manuals IntroductionUsing the Mouse Software ConventionsCommon NB-30 Bridge Window Fields Device DescriptionUsing Window Buttons Getting Help Using On-line HelpAccessing On-line Documentation NB-30 Bridge Firmware Getting Help from the Cabletron Systems Global Call CenterIntroduction NB-30 Bridge Firmware NB-30 Bridge Chassis View Viewing Chassis Information Front Panel Information Menu Structure DateDevice Menu Utilities MenuHelp Menu Board MenuNB-30 Bridge Port Status Display Chassis ManagerManaging the Bridge Viewing Hardware TypesSetting the Device Date and Time Edit Date WindowEnabling and Disabling Bridging NB-30 Bridge Chassis View Managing the Bridge NB-30 Bridging Bridging BasicsAbout Transparent Bridging Viewing and Managing Bridging InterfacesBridge Status Bridge Status Condition Bridge LocationBridge State on Interface OK/SQE onBridge Status on Remote Port Interface Interface Name Interface TypeBridge Port Address Local Ethernet Port Segment NameAccessing Bridge Status Window Options Enabling and Disabling BridgingBridge Statistics Performance GraphsFrames Filtered Frames ForwardedFrames Received Device Errors NothingDiscarded Inbound Ethernet Port Only Forwarded OutboundCRC Errors Timeout Remote Port OnlyTotal Errors Out of Window Coll. Ethernet Port OnlyBridge Summary Statistics Bridge Summary Statistics WindowEthernet and Remote Port Statistics Remote Port Statistics Window OOW Ethernet Port Only Packets Filtered Blue Ethernet Port OnlyXmit Aborts Ethernet Port Only Timeout Bridge Spanning TreeFraming GiantsBridge Spanning Tree Window Bridge Level Parameters Forwarding Delay ProtocolHello Time Max AgeBridge Port Level Parameters Configuring Spanning Tree TopologyChanging Bridge Priority Changing the Spanning Tree Algorithm Protocol TypeChanging Max Age Time Changing Forwarding Delay TimeChanging Hello Time Changing Path Cost Filtering DatabaseChanging Port Priority NB-30 Bridging Type NumberCapacity Ageing TimeConfiguring the Filtering Database ListAddress Port FilteringAdding or Deleting Individual Filtering Database Entries Changing the Type of EntryChanging the Port Filtering Action DSX-1 Summary Erasing Entries from the Permanent or Acquired DatabasesConfiguring, Running, and Checking the Loopback Test Bridge DSX-1 Summary WindowRestoring Bridge Defaults Viewing the T1 Link Channel StatusResetting Bridge Counters Select Restore DefaultsSelect Reset Counters Restarting the BridgeNB-30 Bridging Restarting the Bridge NB-30 Bridging Restarting the Bridge Index Index-2 Index-3 Index Index-4

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.
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