For reference, the following table describes what happens to a MAC address at the SmartSwitch 1800 if the sending and receiving formats are different.

Table 3-1 MAC Address Conversion

Received from:

Forwarded to: Action taken:

 

 

 

 

 

 

802.3

802.5

Converts MAC header to LAN header (including cached

 

 

RIF), and bit-swaps address

 

 

 

802.3

Native LLC2

Drops MAC header

 

 

 

802.5

802.3

Coverts LAN header to MAC header, and bit-swaps address

 

 

 

802.5

Native LLC2

Drops LAN header

 

 

 

Native LLC2

802.3

Adds MAC header

 

 

 

Native LLC2

802.5

Adds LAN header (including cached RIF)

 

 

 

LAN IDs

LAN IDs can be configured in two places:

●LLC2 node defaults, to identify a virtual bridge that connects the LLC2 function to LAN interfaces.

●LLC2 frame relay interfaces using 802.5 Source Route Bridge format, to identify the ring number used by a source-route bridge at the remote end. (This ID is normally assigned by a system administrator.) Note that the LAN ID on an originated LLC2 interface must match the LAN ID on the corresponding termi- nated interface.

Be aware that when configuring these records, LAN IDs must be entered in hex. Also note that, other than the matching IDs on each originated/terminated interface pair, each LAN ID must be unique within the network on which the SmartSwitch 1800 will operate.

LLC2 Function

Internally, LLC2 connects to interfaces via the Bridge protocol. LLC2 Host and Interface records act as both origination and termination points for LLC2. For example, if you are configuring SDLC-to-LLC2 conversion to be transmitted over frame relay to a Token Ring host, the following is the logical LLC2 record flow: SNA Port/PU record (page 9-4), with the parameter LLC2 Connection set to Yes. (This acts as the both the LLC2 Host and LLC2 Interface termination record). In addition, you must configure an originated Host for the target MAC address, and an interface for the physical connection.

Terminated LLC Host records always make the calls. Originated LLC Host records always expect to receive calls.

Only one Originated and one Terminated LLC Host record can be configured for each MAC address.

3-6

SmartSwitch 1800 4. 0 User Guide, Rev 01

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Cabletron Systems 1800 manual MAC Address Conversion, Received from Forwarded to Action taken
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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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