Switch Stacking: Which Should You Choose?

Switch stacking, in layman's terms, is to combine multiple switch devices that support stacking features, and then use special cables and modules to plug into the ports with stacking functions, connect these switches together, and logically combine them into switching devices. By controlling the configuration of the main switch to achieve the purpose of configuring the entire stacking unit switch, multiple stacking switches can be managed with only one IP address, which can improve network efficiency and simplify management. The main switch is responsible for the operation, management and maintenance of the system. Other member switches can serve as backups for the main switch and handle business at the same time. Once the main switch device fails, the system will quickly and automatically select a new main switch to ensure that the business is not interrupted. Through switch stacking, high network reliability, large network data forwarding, and simplified network management can be achieved.

Switch stacking methods mainly include three types: DAC high-speed cable direct stacking, AOC active optical cable direct stacking, and optical module + fiber patch cord stacking. Here is a brief explanation of each:

DAC High-Speed Cable Direct Stacking

Description: DAC (Direct Attach Cable) high-speed cables use copper wires to connect and stack switches directly. These cables typically come with fixed transceivers on each end, specifically designed for short-range data transmission.

Characteristics:

Transmission Medium: Copper cable

Advantages:Low Cost: Generally cheaper than the other methods.

Low Latency: Direct cable connections typically have lower latency.

Ease of Use: Simple to install and use.

Disadvantages:

Limited Distance: Typically suitable for short distances (usually not exceeding 7 meters).

Less Flexibility: Copper cables are less flexible and not ideal for environments requiring frequent movement or adjustments.

AOC Active Optical Cable Direct Stacking

Description: AOC (Active Optical Cable) direct stacking uses optical fiber with integrated transceivers and signal amplification components. These cables convert electrical signals to optical signals and vice versa, allowing for longer transmission distances compared to DAC.

Characteristics:

Transmission Medium: Optical fiber

Advantages:Longer Distance: Supports longer transmission distances compared to DAC (typically between 7 and 100 meters).

Lightweight: Optical cables are lighter and easier to manage and route.

High Performance: Active optical cables amplify optical signals, maintaining high performance over longer distances.

Disadvantages:

Higher Cost: More expensive than DACs.

Power Requirement: Active optical cables require power, which can add complexity.

Optical Module + Fiber Patch Cord Stacking

Description: This method involves using separate optical modules (transceivers) and fiber optic patch cords. The optical modules are inserted into the switch's ports, and fiber patch cords are used to connect these modules, enabling high-speed and long-distance data transmission.

Characteristics:

Transmission Medium: Optical fiber

Advantages:Highly Flexible: Supports very long transmission distances (hundreds of meters to kilometers).

Good Scalability: Allows for various types of optical modules and fibers to meet different needs.

High Performance: Optical fiber transmission offers low latency and high bandwidth.

Disadvantages:

Highest Cost: The total cost of optical modules and fiber patch cords is generally the highest.

High Complexity: Installation and maintenance require more specialized knowledge.

Since DAC, AOC, and optical modules can all achieve switch stacking, when should we choose DAC high-speed cables/AOC active optical cables? When should we choose optical module stacking?

Our Selection Suggestions are Short Distance, Cost-Sensitive: Choose DAC high-speed cable direct stacking.Medium Distance, Performance-Oriented: Choose AOC active optical cable direct stacking.Long Distance, High Performance Requirement: Choose optical module + fiber patch cord stacking.Choose the most suitable stacking method based on your specific needs and budget.

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