N3-LPDU Count, Tw-LPDUs Outstanding | Cabletron Systems 1800

SNA Status and Conﬁguration

The value is the amount of time in milliseconds; the default value is 100. The value must be less than the value for the T1-Reply Timer (see above) to ensure that the remote link station will receive the delayed acknowledgment before the T1 Timer expires.

Ti-Inactivity Timer

This timer is used by the local node to detect an inoperative condition in either the remote link station or the transmission medium. The timer will be started if the T1-Reply Timer has been reset (see above), and additional LPDUs have been sent by the remote link station, and there are no outstanding acknowledgments or responses from the local node.

If the local node does not receive an LPDU before the Ti-Inactivity Timer expires, the station must send an LPDU with the P bit set to BÕ1Õ to solicit the remote stationÕs status. Recovery then proceeds as described under T1-Reply Timer (see above).

The value is the amount of time in seconds; the default value is 30.

N3-LPDU Count

This is the number of Information LPDUs that will be received by the local node before it sends an acknowledgment. This parameter is used in conjunction with the T2-Recv Ack Timer to allow stations to reduce trafÞc. A counter is initialized to the value speciÞed, and is decremented by one each time a valid sequential Information LPDU is received. When the counter reaches 0, an acknowledgment is sent. The counter is reset whenever an Information or Supervisory acknowledgment LPDU is sent by the local node. The default value for this parameter is 3.

Tw-LPDUs Outstanding

This is the maximum number of sequentially numbered Information LPDUs that the local node can have outstanding. When the number is reached, an acknowledgment will be sent. The default value for this parameter is 7.

N2-Expired T1 LPDUs

This is the maximum number of times that an LPDU (including Information LPDUs resent after a checkpoint operation) will be sent following the expiration of the T1 Timer. The default value for this parameter is 8.

Priority

This Þeld prioritizes the interface for trafÞc within the device; the higher the number, the higher the priority. This priority has no effect on trafÞc exiting the device. Priorities are conÞgured on all logical interfaces that use a physical frame relay port. The FRX or SmartSwitch 1800 processor uses these priorities to help determine the order in which it will process protocols. The default value for this parameter is 0.

7-22	Conﬁguring LLC2

1800, FRX4000, FRX6000 specifications

Cabletron Systems, a leading player in network management and telecommunications solutions during the late 20th century, introduced several innovative products that played a crucial role in shaping enterprise networking. Among these were the Cabletron FRX6000, FRX4000, and the FRX1800, which delivered advanced features aimed at enhancing network performance, security, and scalability.

The Cabletron FRX6000 was designed as a robust multi-layer switch, ideal for large-scale enterprise environments. It supported extensive routing capabilities, allowing organizations to manage traffic efficiently even under heavy loads. The FRX6000 boasted high throughput rates and low latency, making it suitable for demanding applications. With support for various network protocols, including IP, IPX, and AppleTalk, its adaptability made it a versatile choice for diverse networking needs. Moreover, security features like VLAN support and Access Control Lists (ACLs) provided enhanced protection against potential threats.

Moving to the FRX4000, this model offered a balance between performance and cost-effectiveness. The FRX4000 maintained many of the essential features of its larger counterpart while catering to medium-sized enterprises. It provided Layer 3 routing and could handle multiple simultaneous connections, ensuring seamless communication across departments. The modular design allowed for easy upgrades, enabling businesses to expand their network infrastructure without significant overhauls. This made the FRX4000 an attractive option for organizations looking to optimize their network investments.

Lastly, the FRX1800, designed for small to medium businesses, focused on simplicity and ease of use while still incorporating powerful network management capabilities. Its user-friendly interface made it accessible for organizations lacking extensive IT resources. The FRX1800 provided essential functionalities such as Integrated Layer 2 switching and routing, network monitoring, and basic security features, ensuring that even smaller companies could maintain efficient, reliable networking without overwhelming complexity.

All three models utilized advanced technologies, including a high bandwidth backbone and state-of-the-art switching architecture, to enable fast and reliable data transfer. They also supported Quality of Service (QoS) mechanisms, allowing businesses to prioritize critical applications and ensure consistent performance across the network.

In summary, the Cabletron FRX6000, FRX4000, and FRX1800 were pivotal in enhancing network capabilities, providing organizations with scalable, secure, and high-performance options tailored to their specific needs.

Cabletron Systems 1800, FRX4000, FRX6000 N3-LPDU Count, Tw-LPDUs Outstanding, N2-Expired T1 LPDUs

Models: 1800 FRX4000 FRX6000