How Filter Masks Work

Node N ame=node_xyz

Bridge Filter D efinitions
*	Filter Category	5–MA C
*	Filter ID	1
A	Filter Name	filter_abc
B	Sou rce MAC Ad dres s Value	ff00ac00
C	Sou rce MAC Ad dres s Mas k	ffff0000
D	Destination MAC Add ress V alu e	10ac45000001
E	Destination MAC Add ress Mask	ffffff000000

Op tion ::

Figure 16-2 Bridge MAC Filter Configuration Screen

[A],[A],[E],[F],[G] from Main Menu

Most Bridge filter parameters are assigned values and associated "masks." The mask determines (by the process described below) whether the filter will be applied to the packet.

The binary bits of the mask will be "ANDed" (0+0=0, 0+1=0, 1+1=1) to the value, as in this example:

Assume the value (hex) is 1234 and the mask is F000. The binary "ANDing" is as follows:

Value:0001001000110100

Mask:1111000000000000

AND Result: 0001000000000000

The mask will also be ANDed to its corresponding field in each Bridged packet as determined by Bridge Filter Applications. This result will be compared to the AND result of the configured value and mask. If the two results match, the filter will be applied. This process allows a number of packet field values to match the AND result of the mask and value; for example:

Packet field = 1233, Mask = F000: Binary value: 0001001000110011

Mask: 1111000000000000

AND Result: 0001000000000000

Packet field = 1237, Mask = F000:

Value: 0001001000110111

Mask: 1111000000000000

AND Result: 0001000000000000

Configuring Bridging

16-7

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.

Cabletron Systems 1800 manual How Filter Masks Work, Bridge MAC Filter Configuration Screen

Models: 1800

Figure 16-2 Bridge MAC Filter Configuration Screen

How Filter Masks Work

1800 specifications