Manuals / IBM / Computer Equipment / Switch

IBM 8260 manual Beacon Recovery on the Module Switching Modules

Models: 8260

1 354
Download 354 pages 1.89 Kb
Page 180
Image 180

Ring monitors are associated with each port and can be switched from upstream to downstream of that port. When the ring monitor detects a Beacon MAC frame on the ring, it calls in the Recovery ASIC to perform beacon recovery and isolate the faulty port (station). The following sections describe the beacon recovery procedures employed in the module switching modules and the per-port switching modules.

8.9.4 Beacon Recovery on the Module Switching Modules

As described in 8.9.1, ªIntroductionº on page 151, when a ring station detects a failure of token-claiming following a hard error, it transmits a Beacon MAC frame. The Beacon MAC frame can be one of the following types:

∙

∙

∙

Type 2

Type 3

Type 4

The Downstream Recovery ASIC (DRA) is normally operating in ″MAC frame monitor″ mode, but as soon as it detects one of the above beacon frames, it enters ″frame transmit″ mode and starts transmitting Beacon Type 1 MAC frames.

Note

If DRA sees a Beacon Type 1 (that is, a Beacon MAC frame issued by a DRA on another module) it will remain in ″MAC frame monitor″ mode and will not issue its own Beacon Type 1 MAC frames. This happens when a beaconing condition is encountered on another module which is attached to the same ring as this module.

The Beacon Type 1 MAC frames issued by DRA will first go onto the backplane and then through all the other token-ring modules and lobes that make up the beaconing ring. If the Beacon frames reach the Upstream Recovery ASIC (URA) on this module, two conclusions can be made:

1.The rest of the ring is complete and operating normally and

2.The fault must be somewhere in this module or the stations attached to this module or on the trunks

At this point, the module is wrapped from the backplane and Recovery ASIC begins wrapping ports sequentially, starting with the first active port upstream of DRA. The wrapping of the ports continues until the normal operation of the ring is restored. The normal operation of the ring is detected when the DRA starts receiving its own Beacon Type 1 MAC frames. At this point, the Recovery ASIC, has isolated the beacon fault domain to two ports (the last two ports which are wrapped) on this module.

To determine which one of the two ports is causing the beaconing condition, it now wraps all the ports on the module and then tests each of the two ports in the fault domain individually. The faulty port will be wrapped permanently and the remaining ports of the module will be unwrapped and the module will be inserted back into the backplane ring.

For example, in Figure 97 on page 159, if a beaconing condition is caused by station ″ B″ attached to module 1, the downstream station (station ″C″), will

158 8260 Multiprotocol Intelligent Switching Hub

Page 179 Page 181
Page 180
Image 180
IBM 8260 manual Beacon Recovery on the Module Switching Modules
Page 179 Page 181

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.