Configuring X.25 Address Translation Templates

The X.25 address translation function in the SmartSwitch 1800 provides automatic translation of selected fields within a Call Request packet, according to a previously defined "template." You can change the called address, calling address, user data, and/ or facilities fields of a Call Request packet as it passes into or out of the node.

There are various uses for this feature; for example:

●For security reasons, a translation of the calling address might enable routing of all Call Request packets with certain addresses, while all others are cleared.

●Translation of user data can allow rerouting of all packets with the same called address, with all those containing one type of information going to one location, while those with another type go elsewhere.

The translation template has two parts: the template ID and the translation formula. The Call Request packet can be modified (using the translation formula) to replace parts of it with characters specified by the formula and/or with parts of the template ID.

Each port has two sets of translation templates associated with it, one for incoming packets and one for outgoing packets. When an incoming packet enters the node, it is immediately checked against any incoming template defined for that port. If the packet matches the template, a translation is carried out and the packet continues toward its destination, using the routing tables defined by SVC Subscriber configu- ration. If the packet does not match the template, it is not accepted.

An outgoing packet is checked just before it leaves the node. If it matches the tem- plate, a translation is carried out; if it does not match, it continues unchanged.

The hunt group function is performed within the routing table process, so to handle outbound packets, a port that is part of a hunt group needs a set of templates that is specific to that port. This allows a different set of outbound translations for each port.

Address translation is especially useful in providing backup routing via a public data network (PDN), as represented in the following example.

Primary route failed

Node 1

Node 2

Backup route over PDN

Figure 8-8 Backup Using Address Translation

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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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