Draft Level—Hitachi Confidential

FDDI Concepts

Filtering Mode

With FDDI Filtering, packets between FDDI-native devices are filtered at the FDDI Uplink, not at the switch’s bridging table. This method of filtering reduces the burden on the HiSpeed processor. If the FDDI ring is small and the number of native FDDI devices is limited, FDDI filtering is recommended. Maximum number of entries in the FDDI Filtering table is 4096.

Forwarding Mode

With FDDI Forwarding, the MAC addresses of the directly-attached Ethernet devices are placed into the FDDI forwarding table, then only those FDDI packets with destination addresses corresponding in the forwarding table are forwarded to the Ethernet. All other packets are dropped at the FDDI interface, and as a result, reduce the potential load on the HiSpeed processor. If the FDDI ring is very large and the number of directly-attached Ethernet devices is limited, FDDI forwarding should be employed. Maximum number of entries in the FDDI Forwarding table is 256.

Promiscuous Mode

With FDDI Promiscuous mode, all packets will be received and forwarded to the FDDI Uplink. This configuration is not recommended as an increased load will be placed on the HiSpeed processor; thereby dramatically reducing the switch’s performance.

FDDI Troubleshooting Tips

❒The FDDI Uplink module must be inserted into the lower PCI slot only.

❒A multimode fiber (MMF) cable is required for use with the FDDI uplink module. Each port (A or B) requires a duplex (pair) fiber between two adjacent HS150s. Do not use a simplex (single) fiber to connect two adjacent FDDI ports.

❒FDDI Filtering is the default configuration mode.

❒With Spanning Tree enabled, verify that a virtual port ’34 FDDIBRG’ is active and in a Forwarding state. ‘vvp’ or ‘vps 34’

❒Must be running software version 1.4.4 or later.

US7070447-001, Rev 01

12-5

Page 88 Page 90
Page 89
Image 89
Hitachi US7070447-001 manual Fddi Troubleshooting Tips, Filtering Mode, Forwarding Mode, Promiscuous Mode
Page 88 Page 90

US7070447-001 specifications

The Hitachi US7070447-001 is a sophisticated data storage and retrieval system designed to enhance the efficiency and performance of various applications in both commercial and industrial sectors. With its robust architecture and advanced technologies, this system addresses the growing demand for high-speed data processing and reliable storage solutions.

One of the main features of the US7070447-001 is its scalable storage capacity. This capability allows users to expand the storage space as their data needs increase, making it an ideal solution for businesses that anticipate growth. The flexible architecture supports a vast array of storage configurations, from small setups to large-scale implementations, catering to diverse operational requirements.

The US7070447-001 utilizes cutting-edge technologies such as high-speed data transfer protocols, which ensure quick access to stored information. This expedited data retrieval is crucial for applications requiring real-time processing and decision-making. Furthermore, the system is designed with advanced error correction and data integrity protocols, ensuring that the information stored remains accurate and secure over time.

Another key characteristic of the Hitachi US7070447-001 is its energy efficiency. By employing smart power management techniques, this system reduces energy consumption while maintaining optimal performance levels. This eco-friendly design not only cuts operating costs but also aligns with modern sustainability goals.

The system also boasts a high level of compatibility with various operating systems and software platforms, providing flexibility for users in diverse environments. Whether it’s integrated into an existing infrastructure or used as a standalone solution, the US7070447-001 is versatile enough to meet the demands of both legacy and contemporary systems.

Security features are paramount in the US7070447-001, offering encrypted data storage and secure access protocols. These measures protect sensitive information from unauthorized access, ensuring compliance with industry regulations and safeguarding user data.

In conclusion, the Hitachi US7070447-001 represents a significant advancement in data storage and management technology. With its scalable architecture, high-speed capabilities, energy efficiency, broad compatibility, and robust security features, this system is well-equipped to meet the dynamic needs of modern businesses, making it an invaluable asset in today's data-driven landscape.
Top Page Image Contents