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What Is L2+ Switch? The Differences of L2, L2+, L2++ Network Switch

Author Moore

Date 08/10/2023

This article introduces what are L2, L2+, and L2++ switches, the difference between them, and how to choose between them to get the best performance.

Ethernet switches have been the backbone of local area networks (LANs) for decades, providing the essential framework for seamless data communication within modern enterprises. As networking technology advances, different variants of switches have emerged to cater to varying requirements. In this article, we delve into the world of Ethernet switches, explicitly focusing on Layer 2 (L2), Layer 2+ (L2+), and Layer 2++ (L2++) switches. We'll explore each type's features, benefits, and differences, helping you make an informed decision when choosing the right switch for your network needs.


What are L2, L2+, and L2++ Switches?


Layer 2 (L2) Switches: Building the Foundation


Layer 2 (L2) switches form the fundamental building blocks of modern network infrastructures. These switches operate at the data link layer of the OSI model, focusing on enhancing the efficiency and speed of data transmission within a local area network (LAN). At their core, L2 switches excel in rapidly forwarding Ethernet frames based on MAC addresses. As data packets arrive, L2 switches learn the source MAC addresses and corresponding switch ports, creating a dynamic MAC address table for efficient future data forwarding. By doing so, L2 switches eliminate the need to flood traffic to all connected devices, resulting in optimized data delivery and reduced network congestion. 


Additionally, L2 switches enable the isolation of broadcast domains by implementing Virtual LANs (VLANs), enhancing network security and ensuring broadcast traffic remains within designated segments. This essential yet crucial network segmentation capability paves the way for improved network management, security, and efficiency. L2 switches are known for their simplicity, making them an ideal choice for small to medium-sized networks


seeking cost-effective solutions that lay a solid foundation for expanding network capabilities.


Layer 2+ (L2+) Switches: Elevating Performance and Security


Layer 2+ (L2+) switches represent a significant step forward in network functionality, offering enhanced features that elevate both performance and security. These switches build upon the foundation of Layer 2 switches while introducing advanced capabilities to meet the demands of modern networks. 


With L2+ switches, administrators gain more comprehensive control over network traffic through improved VLAN management and the ability to implement port mirroring, facilitating effective network monitoring and troubleshooting. Quality of Service (QoS) capabilities take center stage in L2+ switches, allowing for the prioritization of specific types of traffic to ensure optimal data flow and responsiveness. Security is bolstered with Access Control Lists (ACLs), enabling fine-grained control over data access and preventing unauthorized access. L2+ switches also introduce more advanced network segmentation options, allowing the administrators to create subnets within VLANs for increased segmentation granularity. 


This heightened functionality balances performance and affordability, making L2+ switches an attractive option for networks that require improved management, security, and efficiency without sacrificing cost-effectiveness.


Layer 2++ (L2++) Switches: Unleashing Advanced Features


Layer 2++ (L2++) switches mark the pinnacle of advanced networking solutions, offering a comprehensive suite of features designed to empower networks with unparalleled flexibility and security. L2++ switches redefine network management by encompassing an array of cutting-edge functionalities. 


These switches boast robust Quality of Service (QoS) features that allow for meticulous traffic control, ensuring that critical data receives the utmost priority. Dynamic routing protocols enhance network adaptability by enabling efficient path selection and optimizing data transmission across diverse routes. Security is paramount in L2++ switches, with advanced measures such as DHCP snooping and IP source guard fortifying defenses against unauthorized access and malicious attacks. The Spanning Tree Protocol (STP) is elevated with enhancements that guarantee network redundancy and minimize downtime in case of link failures. 


Perhaps most impressively, L2++ switches facilitate complex network segmentation and management, allowing administrators to create intricate sub-networks precisely. This level of control makes L2++ switches indispensable for organizations seeking the utmost in network customization, security, and performance.


Distinguishing Factors: Comparing L2, L2+, and L2++ Switches


A detailed breakdown of the key differences and unique attributes of L2, L2+, and L2++ switches. The following tabular analysis provides a concise overview of the features and capabilities of Layer 2, Layer 2+, and Layer 2++ switches across various aspects:


Aspects L2 Switches L2+ Switches L2++ Switches
Port Density and Performance Moderate port density Moderate to high port density High port density
Scaling Limited scalability Good scalability Excellent scalability
VLAN and Network Segmentation Basic VLAN support Enhanced VLAN management Complex network segmentation
Flexibility Basic network segmentation More advanced segmentation Highly granular segmentation
Quality of Service (QoS) Basic traffic prioritization Improved QoS implementation Robust QoS capabilities
Hierarchy and Implementation Limited QoS control Prioritization and control Advanced traffic management
Security Mechanisms Basic security measures ACLs for enhanced security Advanced security features
Access Control Basic access controls Fine-grained access control IP source guard, DHCP snooping
Routing Protocols No routing protocols Limited dynamic routing Dynamic routing protocols
Network Flexibility Limited network flexibility Increased flexibility Advanced network adaptability
Redundancy and High Availability Limited redundancy options Improved redundancy features

Enhanced high availability


From this table, we can see that L2 switches only support part of the primary functions. At the same time, L2+ has been partially improved regarding security and functionality, and L2++ switches have obtained most of the advanced functions.


Choosing the Right Switch for Your Network


Selecting the ideal switch type for your network involves a comprehensive evaluation of your requirements. Whether you're considering Layer 2 (L2), Layer 2+ (L2+), or Layer 2++ (L2++) switches, each choice has its unique merits. To help you make an informed decision, let's delve into essential guidelines that cater to various network scenarios.


Considerations for Small-Scale Networks


For smaller networks, understanding the optimal fit for your needs is essential.


Optimal Use Cases for Layer 2 Switches


Layer 2 switches shine in uncomplicated environments where basic network functions suffice. These switches suit small businesses, home networks, or scenarios where simplicity and cost-effectiveness take precedence. QSFPTEK L2 switches include S1300-8T and S1300-16T.


L2 Switches 

Figure 1: L2 Switches


When L2+ Switches Offer the Perfect Balance


L2+ switches step in when you require improved performance and security without overwhelming your network with complexity. These switches find their sweet spot in mid-sized organizations that need moderate network segmentation and advanced security measures. QSFPTEK L2+ switches include S5300-24P4TS, S5300-48T4X, and S5300-24T4S. 


L2+ Switches 

Figure 2: L2+ Switches


Determining Scenarios Warranting L2++ Switches


In cases demanding advanced features such as dynamic routing, intricate QoS control, and complex network segmentation, L2++ switches deliver. Large enterprises, data centers, or organizations with complicated networking requirements benefit significantly from the capabilities of L2++ switches. QSFPTEK L2++ switches include S5300-16S8TS4X and S5300-48P6X.



Figure 3: L2++ Switches


Scalability and Future-Proofing


Anticipating your network's growth and adaptability is vital for long-term success.


Evaluating Network Growth Potential


Assess the potential expansion of your network. If growth is on the horizon, opting for L2+ or L2++ switches ensures your network can handle increased demands, facilitating seamless development.


Compatibility with Future Network Upgrades


Select a switch that aligns with future network upgrades, such as higher bandwidth needs or evolving protocols. L2+ and L2++ switches are engineered to accommodate these upgrades, ensuring your network remains adaptable and up-to-date.


Budgetary Constraints and Cost Efficiency


Balancing advanced features with budget considerations is pivotal in making the right choice.


Aligning Switch Choices with Available Resources


Evaluate your budget and available resources. While L2 switches offer cost-effectiveness, L2+ or L2++ switches provide enhanced functionality and scalability for those willing to invest more.


Maximizing ROI Through Smart Switch Selection


Keep in mind that investing in switches with advanced capabilities can yield a higher return on investment (ROI) over time through enhanced network efficiency, security, and future-proofing.


Integration with Existing Infrastructure


Transitioning to a new switch type should be seamless and interoperable.


Ensuring Compatibility with Current Network Equipment


Choose a switch type that integrates seamlessly with your existing devices, minimizing disruption and the need for extensive reconfiguration.


Seamless Transition and Interoperability


Prioritize a switch that fosters a smooth transition by promoting interoperability with your current infrastructure. This ensures minimal downtime and a hassle-free switch upgrade.


Following these comprehensive guidelines, you can confidently navigate the decision-making process and select the switch type – L2, L2+, or L2++ – that best aligns with your network's size, future goals, budget, and current setup. Making an informed choice today guarantees a network infrastructure that meets current demands and seamlessly accommodates future growth and technological advancements.




As technology continuously advances, the world of Ethernet switches continues to evolve. L2, L2+, and L2++ switches offer a range of features and capabilities, each catering to specific networking needs. Whether establishing a basic LAN, seeking a balance between performance and cost, or requiring an intricate network management solution, understanding these switch variants empowers you to make the right choice. By selecting the appropriate switch for your network requirements, you can pave the way for efficient data communication, enhanced security, and future scalability within your organization's network infrastructure. If you want to get more information about L2 switches, please contact QSFPTEK via sales@qsfptek.com. 


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