Cabletron Systems NB30 manual Device Errors, Nothing, Discarded Inbound Ethernet Port Only

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NB-30 Bridging

Device Errors

The total number of frames (either inbound or outbound) containing errors which prevented them from being processed by the bridgeÕs interfaces.

Nothing

The selected scale is not currently in use.

For the port level window, you can choose from among the following display options. Note that some of these options are available only for the local Ethernet port or only for the remote port, as indicated in the Þeld deÞnitions below.

Frames Received

The total number of frames received by the selected bridge interface from the other bridge interface, as read from the device after each poll interval.

Discarded Inbound (Ethernet Port Only)

Displays the number of packets which were discarded at the port on reception. One possible reason would be to free up buffer space Ñ even though no errors were detected in the packet on reception. Discarding good packets often indicates a very busy network. If a device routinely discards packets, it usually means that network trafÞc is overwhelming the device Ñ perhaps because the deviceÕs performance is inadequate for the rate of trafÞc on the network.

Another reason might be that the incoming packet was not formed correctly for use on an Ethernet Ñ for example, it may be too large or formatted according to an unknown or unsupported protocol.

Forwarded Outbound

The number of frames forwarded by the selected bridge interface to the other interface on the bridge.

Lack of Buffer Space

The number of frames that were discarded speciÞcally because the NB-30Õs frame buffer could not keep up with the rate of trafÞc on the network.

Trans Exceeded (Ethernet)

The number of frames that were discarded because the maximum time for forwarding was exceeded before it could be transmitted by the port.

Collisions (Ethernet Port Only)

The total number of collisions detected in the transmission of frames by the selected port. A collision is a natural by-product of a busy network Ñ although an extremely high rate might indicate a data loop or a node with a hardware problem.

Trans. Aborted (Ethernet Port Only)

The total number of frame transmissions from this port that had to be aborted because of an excessive number of collisions.

Bridge Statistics

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Contents NB30 User’s Guide Page Virus Disclaimer Page Restricted Rights Notice Page Contents Index ContentsIntroduction Using the NB-30 Bridge User’s GuideIntroduction Related ManualsSoftware Conventions Using the MouseDevice Description Common NB-30 Bridge Window FieldsUsing Window Buttons Accessing On-line Documentation Using On-line HelpGetting Help Getting Help from the Cabletron Systems Global Call Center NB-30 Bridge FirmwareIntroduction NB-30 Bridge Firmware NB-30 Bridge Chassis View Viewing Chassis Information Front Panel Information Date Menu StructureUtilities Menu Device MenuHelp Menu Board MenuChassis Manager NB-30 Bridge Port Status DisplayViewing Hardware Types Managing the BridgeEdit Date Window Setting the Device Date and TimeEnabling and Disabling Bridging NB-30 Bridge Chassis View Managing the Bridge Bridging Basics NB-30 BridgingViewing and Managing Bridging Interfaces About Transparent BridgingBridge Status Bridge Location Bridge Status ConditionOK/SQE on Bridge State on InterfaceBridge Status on Remote Port Interface Interface Type Interface NameBridge Port Address Local Ethernet Port Segment NameEnabling and Disabling Bridging Accessing Bridge Status Window OptionsPerformance Graphs Bridge StatisticsFrames Received Frames ForwardedFrames Filtered Nothing Device ErrorsDiscarded Inbound Ethernet Port Only Forwarded OutboundTimeout Remote Port Only CRC ErrorsTotal Errors Out of Window Coll. Ethernet Port OnlyBridge Summary Statistics Window Bridge Summary StatisticsEthernet and Remote Port Statistics Remote Port Statistics Window Xmit Aborts Ethernet Port Only Packets Filtered Blue Ethernet Port OnlyOOW Ethernet Port Only Bridge Spanning Tree TimeoutFraming GiantsBridge Spanning Tree Window Bridge Level Parameters Protocol Forwarding DelayHello Time Max AgeBridge Port Level Parameters Topology Configuring Spanning TreeChanging Bridge Priority Changing the Spanning Tree Algorithm Protocol TypeChanging Hello Time Changing Forwarding Delay TimeChanging Max Age Time Changing Port Priority Filtering DatabaseChanging Path Cost NB-30 Bridging Number TypeCapacity Ageing TimeList Configuring the Filtering DatabaseAddress Port FilteringChanging the Port Filtering Action Changing the Type of EntryAdding or Deleting Individual Filtering Database Entries Erasing Entries from the Permanent or Acquired Databases DSX-1 SummaryBridge DSX-1 Summary Window Configuring, Running, and Checking the Loopback TestViewing the T1 Link Channel Status Restoring Bridge DefaultsSelect Restore Defaults Resetting Bridge CountersSelect 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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