Now, DRA in ″TR Module 2″ starts tracking the stations that are involved in the neighbor notification process. The tracking will stop when the DRA in ″TR Module 2″ encounters an AMP/SMP MAC frame with the A/C bit set to B′0′, that is, AMP/SMP MAC frame issued by the NAUN to DRA. In this example, that would be the AMP/SMP MAC frame issued by station ″H″.

The stations that take part in the neighbor notification from the time that the URA sees an AMP/SMP MAC with the A/C bit set to B′0′ until the time DRA sees an AMP/SMP MAC with the A/C bit set to B′0′ (stations ″E″ thru ″H″ in our example) are the stations attached to this specific module (″TR Module 2″). These stations will then be associated with the ports that have a raised phantom voltage on the module. In this manner, the Recovery ASIC in each module is able to build the address-to-port map for its portion of the ring.

You can display the address-to-port map using the following DMM command:

SHOW RING_MAP TOKEN_RING LOGICAL token_ring_n or

SHOW RING_MAP TOKEN_RING LOGICAL isolated_n {slot}

An example of the output for this command for a module switching module with two active ports is shown in Figure 98.

 

￿

 

 

 

 

￿

 

 

 

 

 

 

8260>

show ring_map token_ring logical token_ring_1

 

 

 

Token

Ring Logical Map for Network TOKEN_RING_1

 

 

 

MAC Address

Slot

Port

 

 

-----------------

-----

----

 

 

 

 

02-00-00-c0-cc-1c

05.01

1

 

 

 

 

08-00-8f-40-01-a6

05.01

3

 

 

 

￿

8260>

 

 

 

￿

 

 

 

 

 

 

Figure 98. Address-to-Port Map Display for a Module Switching Module

When a new station on the module inserts into the ring, it raises a phantom voltage. The Recovery ASIC waits for the next neighbor notification process to occur to determine the new MAC address and associates that MAC address with the new port.

8.10.1.1 Support for Fan-Out Devices

The 8260 token-ring modules provide support for the attachment of up to a maximum of 8 stations to a single port through the use of fan-out devices (splitters).

Note

Currently, the 8260 only supports the fan-out devices and splitters that provide a phantom signal.

To understand how the address-to-port map is built for the fan-out attached devices, let′s assume that the module shown in Figure 99 on page 162 has a fan-out device attached to its second port and currently there is only a single station (station ″ B″) attached to the fan-out device. This is like having no fan-out

Chapter 8. 8260 Token-Ring Support 161

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IBM 8260 manual Support for Fan-Out Devices, Address-to-Port Map Display for a Module Switching Module
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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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