Link Aggregation


Link aggregation is a networking concept that involves the combination of multiple network connections in parallel to increase throughput beyond what a single connection could sustain and to provide redundancy in case one of the links fails. It effectively increases the network’s capacity while maintaining fast transmission speed and high data transfer rates. This technique can be used in both wired and wireless networks.


The phonetics for ‘Link Aggregation’ is: lɪŋk æɡrɪˈɡeɪʃən

Key Takeaways

  1. Improved Network Capacity and Availability: Link Aggregation, also known as port trunking or EtherChannel, allows multiple physical links to be grouped together and treated as a single logical link. This enhances the network’s total capacity as the combined bandwidth of the aggregated links is utilized, thus, providing greater throughput.
  2. Load Balancing and Redundancy: Link Aggregation automatically balances the network traffic across all available links. If one link fails, the others continue to carry the load, providing a level of redundancy. This fail-safe mechanism ensures constant network availability – crucial for high-availability data center networks.
  3. Interoperability: Link Aggregation supports connections between different networking devices or between a network device and a server. This interoperability comes from the Link Aggregation Control Protocol (LACP), part of the IEEE 802.3ad standard, which aids in the dynamic management of bundled links with better efficiency and reliability.


Link Aggregation, also known as port trunking or teaming, is a significant technology term as it allows the combination of multiple network connections in parallel. This enhancement is crucial as it augments the data capacity (bandwidth) beyond what a single link can deliver, and it provides redundancy in case one of the links fail. It optimizes the usage by balancing network traffic across the combined links, thus improving data transfer speed and providing a more reliable connection. Consequently, this tool enhances overall network performance, boosts the efficiency of data centers, reduces network downtime, and offers a cost-effective solution by lowering the need for bandwidth upgrades.


Link aggregation is a method used in data networking with switches and servers that combines (aggregates) multiple network connections in parallel. The primary purpose of link aggregation is to increase the available bandwidth beyond what a single connection could provide. This is essentially bundling two or more physical links into a single logical high bandwidth link. For example, if you have two 1 Gbps ports and you bind them together, it essentially behaves like a single 2 Gbps port. However, link aggregation does not just multiply the bandwidth of a single connection, but it also provides a measure of fault tolerance. This means, if one network link fails, the other connections continue to carry the network traffic, thus maintaining network connectivity. So, it’s not just about increasing capacity, but also about increasing availability and redundancy. Therefore, link aggregation forms an essential aspect of network design aimed at high availability and high throughput scenarios.


1. Data Centers: In large data centers, link aggregation is commonly used to combine multiple network connections to increase the overall bandwidth available for data transfer and provide redundancy in case one link fails. This helps ensure seamless operation of servers which need to handle large volumes of data traffic.2. Internet Service Providers: ISPs often use link aggregation to improve the reliability of their network. If a single link fails, they can continue providing service to their customers with minimal disruption using the aggregated links.3. Corporate Networks: In a corporate setting, link aggregation can be used to simultaneously connect a company’s server to multiple switches and routers, enhancing the speed and resilience of the network’s data transfer capabilities. This ensures that if one link fails, the network continues to function smoothly with minimal downtime.

Frequently Asked Questions(FAQ)

**Q: What is Link Aggregation?**A: Link Aggregation, also known as Port Trunking, is a method of combining multiple physical network connections into a single logical connection. This process enhances network speed and offers redundancy in case one link fails. **Q: Why do we use Link Aggregation?**A: Link Aggregation increases the network capacity while maintaining a fast transmission speed. It also provides network redundancy, increasing the availability of the network if a single link fails.**Q: How does Link Aggregation contribute to network performance?**A: Link Aggregation allows the simultaneous transmission of multiple data paths, thereby increasing the bandwidth available for data transmission. It also allows for failover when one link becomes slow or fails, leading to more consistent network performance.**Q: Can Link Aggregation be used with all network devices?**A: Not all network devices support Link Aggregation. Both ends of the connection should support the Link Aggregation protocol for it to function properly. **Q: What are some common Link Aggregation protocols?**A: Common Link Aggregation protocols include the Link Aggregation Control Protocol (LACP) by IEEE and the Port Aggregation Protocol (PAgP) by Cisco.**Q: What is LACP?**A: LACP stands for Link Aggregation Control Protocol. It’s an IEEE standard protocol that controls the bundling of several physical ports to form a single logical channel.**Q: What is the difference between static and dynamic Link Aggregation?**A: Static Link Aggregation is manually configured and doesn’t require a network protocol to negotiate between the links. Dynamic Link Aggregation, on the other hand, uses protocols like LACP to automatically manage and negotiate the multiple links.**Q: Does Link Aggregation increase network speed for a single data stream?**A: No, Link Aggregation cannot increase the network speed of a single data stream as it gets sent over one link only. However, it allows multiple data streams to be sent simultaneously over different links, thereby effectively increasing the total bandwidth.

Related Tech Terms

  • Network Interface Card (NIC) bonding
  • Port trunking
  • Spanning Tree Protocol (STP)
  • EtherChannel
  • Switched Fabric

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