Source Addressing

NOTE

The snapshots of the Source Address List that you can obtain via this feature do not reflect the current port security status of the SAT — that is, when Source Address Locking is enabled, you can still observe addresses being aged out of the table (for all ports) and new addresses being added (for trunk ports) as you refresh the Source Address List displayed in this window. However, the SEHI remembers the addresses that were in the table when locking was enabled, and will continue to protect station ports (and, in later versions of EMME/EMM-E6 firmware, RIC MIM trunk ports) from access by unauthorized sources. For more information, see Locking Source Addresses, page 5-5.

Setting the Ageing Time

The source address list Ageing Time determines the minimum amount of time an inactive source address will remain in the Source Address Table before it is purged. The source address timer runs continuously beginning at the time the device is turned on; source addresses that are added to the SAT during one timer cycle will remain in the table for the rest of the current cycle and at least through the next complete cycle. If no packets have been received from that address during one complete cycle, the address will be purged.

The Ageing Time is user-configurable, and can be set using the Ageing Time text box in the Source Address list window.

To change the Ageing Time:

1.In the Source Address List window (Figure 5-2, page 5-3), highlight the displayed ageing time.

2.Enter your desired ageing time in minutes; allowable range is 0 to 4320 (three days).

3.Click mouse button 1 on to save your change.

The new Ageing Time takes effect immediately.

Setting the Hash Type

You can increase the efficiency with which your SEHI handles the Source Address Table by selecting the appropriate hashing algorithm. If you are operating in a DECnet environment, or one which incorporates some DECnet elements, select the DEC hashing algorithm; if your network contains no DECnet elements (or at least none operating on the same network segment as your SEHI), select the non- DEC hashing algorithm. Making the wrong selection won’t do any damage, but making the correct selection will optimize performance.

To set the Hash Type for a repeater interface, or channel:

1.In the Repeater Source Address window, click mouse button 1 on the repeater interface for which you would like to set the hash type.

5-4

Setting the Hash Type

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Cabletron Systems SEHI-32/34, SEHI-22/24 manual Setting the Hash Type, Setting the Ageing Time
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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.
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