Enable Outgoing Rate Control

determines whether the rate parameters (CIR, BC , BE) will be enforced.

Enable Bandwidth Allocation

determines whether bandwidth allocation (described on page 7-6) will be enforced.

For Backup Use Only?

determines whether all DLCIs on the port will be reserved exclusively as backups for other DLCIs in the same node. See "Configuring Frame Relay Backup Groups" on page 7-22.If this parameter is set to Y, the port will remain disabled until needed for backup.

If configuring the port for backup use only, make sure no DLCIs on the port have been configured on an IP, IPX, or LLC2 interface.

Automatic DCE

enables (if Y) automatic detection by the software of whether the port is a physical DCE or DTE. This can be helpful in cases such as a connected backup CSU/DSU, which might be configured differently than the primary connection. The automatic DCE feature allows switchover to occur without reconfiguring the port.

DLCI Parameters

Committed Information Rate (In/Out)

(CIR) is the incoming or outgoing (depending on the parameter) data throughput that the network agrees to support under normal conditions. Outgoing throughput greater than CIR will be reduced to CIR if (a) a packet is received with the BECN (backward explicit congestion notification) bit set, and (b) Enable Outgoing Rate Control is Y.

Committed Burst Size (In/Out)

(BC) is incoming or outgoing (depending on the parameter) the maximum amount of data that the network agrees to transfer under normal conditions within the time period defined by BC/CIR. Any data exceeding BC will have the Discard Eligibility (DE) bit turned on, and will be tracked by the SmartSwitch 1800 statistic DE/sec (*10).

Turning on the DE bit will not automatically cause a packet to be discarded, but will tell the network which packets it can discard if traffic becomes too heavy.

Excess Burst Size (In/Out)

(BE) is the incoming or outgoing (depending on the parameter) maximum amount of data in excess of the Committed Burst Size that the network will attempt to transfer during the time interval used for the Committed Burst Size. Any outgoing data exceeding this value will be buffered in the SmartSwitch 1800, and any incoming data exceeding the value will be discarded.

BECN Recovery Count

is a method of controlling the rate of return to maximum traffic flow after it has been reduced due to congestion. If a packet is received with the BECN (backward explicit congestion notification) bit set, outgoing traffic will be throttled back to CIR, and the effective value of BE will become 0 (limting traffic flow to the configured BC). From that point on, for each "n" packets (where "n" is the value of BECN Recovery Count)

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Cabletron Systems 1800 manual Dlci Parameters
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1800 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.
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