Link/Seg Traps

NOTE

Unterminated BNC (thin coax) ports appear in the Hub View as segmented ports. When you attach a thin coax cable or a 50 Ω terminator to a port, the repeater generates a portUnsegmenting trap; when you remove the cable or terminator, the repeater generates a portSegmenting trap. Note also that devices at both ends of the cable will generate the portUnsegmenting and portSegmenting traps, even if only one end of the cable has been disconnected.

What is a Link Trap?

Some Cabletron Ethernet repeater ports — including RJ45 twisted pair and fiber optic ports — generate a link signal to monitor the status of their connection with the device at the other end of the cable segment. If the cable is removed or broken, the port’s link status goes to “No Link” and the repeater generates a portLinkDown trap. When a port in a “No Link” condition receives a link signal, the port goes to a “Link” condition and the repeater generates a portLinkUp trap. Note that devices at both ends of the disconnected or broken cable will generate the portLinkDown and portLinkUp traps, even when only one end of the cable has been removed.

NOTE

BNC (thin coax), AUI, and transceiver ports do not support a link signal. As described above, BNC ports respond to changes in link status by generating portSegmenting and portUnsegmenting traps; AUI and transceiver ports do not respond at all to changes in link status (unless the port has been segmented due to excessive collisions), and will always display as on, even if no cable is connected.

Enabling and Disabling Link/Seg Traps

Although each Cabletron device comes with a number of traps built in to the firmware, no device will generate these traps unless it is configured to do so. This can be accomplished via Local Management (by enabling traps and entering your workstation’s IP address in the Community Names screen), or via the SPMA Trap Table utility, accessible from the icon menu or from the command line. Once traps as a whole have been enabled, you can use the Link/Seg Traps feature to selectively enable and disable link and segmentation traps as required by your network management needs.

To open the Repeater Link/Seg Traps window:

from the icon:

1.Click on the appropriate SEHI icon to display the icon menu.

2.Drag down to Link/Seg Traps and release.

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What is a Link Trap?

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Cabletron Systems SEHI-32/34, SEHI-22/24 manual What is a Link Trap?, Enabling and Disabling Link/Seg Traps, From the icon

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.