detect this and will issue Beacon MAC frames. These Beacon MAC frames will be repeated by each station (station ″D″ in this case) until they arrive in the DRA in module 1. Upon seeing these Beacon MAC frames, the URA on module 1 will issue Beacon Type 1 MAC frames. The Beacon Type 1 MAC frames will be repeated by every station on module 2 (including the URA and DRA on module 2) until they arrive in the URA in module 1. At this point, the Recovery ASIC on module 1 concludes that the rest of the ring (that is module 2 and its attached stations as well as the backplane) is operational, therefore, the beaconing condition must be on this module.

Recovery ASIC on module 1 starts taking recovery action by isolating module 1 from the backplane and deactivating its ports starting with the one upstream of its DRA (station ″D″) and checking for the status of the ring. After the port attaching station ″D″, the port attaching station ″C″ will be deactivated and so on. As soon as it deactivates the port attaching station ″ B″, the beacon condition is removed; therefore, the fault domain is between station ″ B″ and station ″C″. The Recovery ASIC will then deactivate all the ports on module 1 and then check station ″ B″ and station ″C″ individually, and when it finds that station ″ B″ is the source of problem, it deactivates the port attaching station ″ B″ permanently and then reactivates all the other ports and inserts the module back into the backplane.

Figure 97. Beacon Recovery on the Module Switching Modules

8.9.5 Beacon Recovery on the Per-port Switching Modules

The per-port switching module might have stations attached to 11 token-ring segments consisting of the 10 different rings on the backplane and 11 isolated rings on the module. Therefore, the Recovery ASIC (of which we have only one on each module) is not connected to any rings under normal operating conditions. Instead, the Ring Monitor function (which is implemented on each port) is used to assist the Recovery ASIC with the beacon recovery process in the per-port switching modules.

Under normal operating conditions, the Ring Monitor is located upstream of its associated port. When a Ring Monitor detects the presence of a beaconing condition, by noticing Beacon MAC frames, it alerts the Recovery ASIC. The Recovery ASIC will then be inserted into the ring to which the reporting Ring

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IBM 8260 manual Beacon Recovery on the Per-port Switching Modules, Beacon Recovery on the Module Switching Modules
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8260 specifications

The IBM 8260 is a significant entry in the realm of enterprise servers, recognized for its performance, scalability, and robust features designed to cater to demanding business environments. It primarily serves as a high-capacity server for large organizations, capable of handling extensive workloads and complex applications without compromising speed or efficiency.

One of the standout features of the IBM 8260 is its powerful processing capabilities. It typically comes equipped with multiple processor units based on the IBM POWER architecture, which is renowned for its high-performance computing. This architecture allows the server to execute numerous simultaneous tasks, making it ideal for environments that require multitasking and high throughput.

Memory capacity is another key characteristic of the IBM 8260. Depending on the specific configuration, it can support substantial amounts of RAM, ensuring that applications can run effectively without the bottlenecks often associated with data-intensive tasks. This is crucial for enterprises that rely on real-time data analytics, large database management, and resource-heavy applications.

In terms of storage, the IBM 8260 offers flexible options. It supports a variety of storage solutions, including solid-state drives (SSDs) and traditional hard drives, catering to different performance and capacity needs. This scalability in storage helps organizations manage their data effectively while ensuring quick access and retrieval times.

Connectivity is also a prominent feature of the IBM 8260. The server includes advanced networking capabilities, supporting various protocols and technologies that facilitate fast data transfer and communication between devices. This enhances overall network performance, essential for businesses that depend on cloud computing and distributed computing environments.

Additionally, the IBM 8260 is designed with a focus on reliability and availability. It incorporates redundant components, such as power supplies and cooling systems, minimizing the risk of downtime. This is critically important for enterprises that require continuous availability of services.

The server’s management features are also noteworthy. IBM provides a suite of management tools that allow IT administrators to monitor performance, configure hardware settings, and troubleshoot issues seamlessly. This ease of management is bolstered by automation capabilities, enabling organizations to enhance operational efficiency.

In conclusion, the IBM 8260 stands out in the competitive server landscape due to its high processing power, extensive memory and storage options, advanced connectivity, reliability features, and robust management tools. Such attributes make it a viable choice for organizations seeking to enhance their IT infrastructure and streamline their operations effectively.
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