Using the SEHI Hub View

counted as CRC errors had only CRC errors — they were of legal size (not runts or giants) and had no truncated bytes. You also know that any packet less than 64 bytes long has been counted as a runt, even if it also had alignment and/or CRC problems (which is likely if the runt is the result of a collision or other transmission problem).

Protocols/Frames Statistics

The Protocols/Frames statistics windows display the following fields:

Protocols

OSI Frames

Novell Frames

Banyan Frames

DECNet Frames

XNS (Xerox Network Systems) Frames

IP Frames

Ctron Frames

AppleTalk Frames

Other Frames

NOTE

Because the SEHI does not currently support Protocol counts, the Protocol fields in the Protocols/Frames window will remain blank.

Frame Sizes

Runt Frames (packets smaller than 64 bytes)

64-127 (byte) Frames

128-255 Frames

256-511 Frames

512-1023 Frames

1024-1518 Frames

Giant Frames (packets larger than 1518 bytes)

Viewing the Port Source Address List

You can use the Source Address List option from the Port menu to view the Port Source Address List (Figure 2-11). The Port Source Address List contains the MAC address and its associated vendor name for each device communicating through a specific port on the SEHI or hubstack.

The full features of Source Addressing (including the device-level Source Address List, port locking, source address traps, and find source address) are discussed in the Source Address chapter, later in this book.

Monitoring Hub Performance

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Cabletron Systems SEHI-22/24, SEHI-32/34 manual Viewing the Port Source Address List, Protocols

SEHI-22/24, SEHI-32/34 specifications

Cabletron Systems was a notable player in the networking hardware market during the rise of local area networks (LANs) in the late 20th century. Among its innovative products were the SEHI-22/24 and SEHI-32/34 modules, which were designed to enhance network capabilities in enterprise environments.

The SEHI-22/24 and SEHI-32/34 were versatile high-performance Ethernet switch modules that offered significant advantages in network management and connectivity. These modules were designed to work with Cabletron's modular switching and routing architecture, allowing for scalable solutions tailored to specific network demands. A key feature of the SEHI series was its support for a range of Ethernet standards, ensuring compatibility with diverse networking environments.

One notable characteristic of the SEHI-22/24 was its ability to support both 10Base-T and 100Base-TX Ethernet technologies. This dual support enabled organizations to leverage existing 10 Mbps infrastructure while facilitating upgrades to 100 Mbps speeds without needing a complete overhaul of the network. Similarly, the SEHI-32/34 offered even greater connectivity options, accommodating more users and devices while maintaining high throughput and low latency.

In terms of management features, the SEHI series was equipped with extensive traffic management capabilities, including Quality of Service (QoS) features that prioritized bandwidth for critical applications. This ensured that essential services such as voice over IP (VoIP) and video conferencing could function optimally, even during heavy network loads.

Furthermore, both modules featured advanced diagnostics and monitoring tools that provided network administrators with critical insights into traffic patterns and potential bottlenecks. This functionality was essential for maintaining network health and optimizing performance, especially in dynamic business environments.

Security also played a crucial role in the design of the SEHI-22/24 and SEHI-32/34. The modules incorporated support for various authentication methods and access controls, ensuring that sensitive data remained protected within the corporate network.

In summary, Cabletron Systems’ SEHI-22/24 and SEHI-32/34 offered significant advancements in Ethernet switching technology, allowing organizations to build robust, scalable, and secure networks. With their impressive features, compatibility, and capacity for management and security, these modules were instrumental in shaping reliable networking solutions for enterprises navigating the rapidly evolving digital landscape.