Introduction

Address Purging

To achieve this routine housekeeping, the filter table contains the LAN addresses, along with their LAN port identifier, and a timer flag. Each time a particular address is looked up or added to the table, a timer flag is set for the “fresh” entry. When a time interval, defined by the Bridge/Router Manager expires, the address table is scanned and any “stale” entries that have not been used since the timer expired are removed. This timer is called the “aging timer” and may be controlled through the bridge options.

Purging the address does not prevent the station from using the bridging facilities, since the location of the station may be re-learned. However, there must be a balance, since a small aging timer value will mean that the bridge must learn many addresses often. This also has an effect on performance.

Aging Exception

“Permanent” address entries are an exception to the aging rule. A permanent address is one that is not subject to the aging timer and will remain in the filter table for an indefinite period of time.

A table is reserved for permanent address entries, separate from the table that is used for those non-permanent entries that are subject to aging. These tables may be displayed and modified with the bridge/router options discussed in this manual. Access is made locally from each Bridge/Router Console or one bridge/router can be made Master, able to control all functions of a partner P840 router.

Filled Address Table

Sometimes filter address table may become full. (The filter table can hold 2048 address entries.) A procedure is automatically followed in this event.

This procedure defines that the address, if it does not exist in the table, will not be added, and will be treated as any other unknown address. In this case the frame will be passed to the other segment. An alarm will also be generated with the message “Station Address Table Full,” and from this point, another alarm will be generated only if in the meantime the table empties by 1/3 and then fills up again.

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Perle Systems P840 manual Filled Address Table, Address Purging, Aging Exception
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P840 specifications

Perle Systems is renowned for its high-performance networking hardware, and the Perle P840 model exemplifies this reputation with its advanced features and technologies. Designed for small to medium-sized enterprises, the P840 serves as a versatile and reliable solution for connectivity needs.

One of the main features of the Perle P840 is its robust network performance, supporting both Ethernet and serial connectivity. With support for RS-232, RS-422, and RS-485 interfaces, the P840 enables seamless integration of legacy devices into modern network architectures, allowing businesses to leverage existing infrastructure without the need for extensive upgrades.

The P840 also boasts advanced security features to protect sensitive data during transmission. It supports SSL encryption and VPN capabilities, ensuring that data travels securely across the network. Additionally, it implements strong authentication protocols, providing organizations with peace of mind knowing that their communications are safeguarded against potential threats.

Another standout characteristic of the P840 is its flexibility in configuration. It offers multiple port configurations, allowing for customization based on specific user needs. With options for both managed and unmanaged modes, the device can easily adapt to various network environments. This flexibility makes it suitable for diverse applications, including industrial automation, process control, and telecommunications.

The Perle P840 is designed for durability and reliability, featuring a rugged enclosure that can withstand demanding environments. Its solid-state components reduce the risk of failure, contributing to increased uptime and lower maintenance costs. Furthermore, the compact design allows for easy installation in tight spaces, making it a practical choice for various deployment scenarios.

In terms of management and monitoring, the P840 includes an intuitive web-based interface, enabling administrators to configure settings and monitor network performance effortlessly. SNMP support further enhances management capabilities, allowing for integration into larger network management systems.

Overall, the Perle P840 stands out as a powerful solution for enterprises seeking seamless connectivity, robust security, and flexibility in configuration. Its combination of advanced features and durable design makes it an ideal choice for industries requiring reliable serial and network connectivity in challenging environments. With the P840, businesses can build a resilient networking infrastructure that supports their growing demands while safeguarding their critical data.
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