There are a number of things that is required for LAG to work and some things that UniFi doesn't support. So LAG provides benefits for improved network capacity and greater network redundancy, but the effectiveness depends on your network setup and use case. ![]() A single device may still see a maximum of 1 Gbps in a single direction, as UniFi doesn't load balance or split TCP connections over both links. To break beyond the gigabit barrier and make use of the doubled capacity, usually multiple devices will need to be sending and receiving traffic. That results in a total of 2 Gbps of throughput.īy combining two gigabit Ethernet ports in a LAG, you can have a maximum of 2 Gbps in one direction, or 4 Gbps in total. Theoretically, you can have 1 Gbps of traffic flowing from the device, and 1 Gbps of traffic flowing to the device at the same time. This is due to how UniFi implements LAG and balances traffic across the multiple physical ports.įor example, with a standard gigabit Ethernet switch, a single port can handle 1 Gbps of traffic in either direction. To fully utilize all available bandwidth, it usually requires traffic from multiple devices to be passing through the LAG connection. Once you have two or more network cables between switches or devices, this can allow for greater network redundancy and increased maximum throughput. I have ports 2 and 4 on Switch 1 connecting to 1 and 3 on Switch 2. Below is an example of a LAG setup that would not work, due to the port numbers not being in sequential order. With UniFi switches, there is a requirement to use sequential ports. This can be between many network devices, such as a PC with multiple NICs installed, NAS servers, or network switches. Once this is enabled, the devices or switch connected to each end of the cables have multiple physical connections between each other. Simply put, link aggregation is the the aggregation or combination of two or more ports. How To Enable Link Aggregation (LAG) In UniFi We'll also explore what benefits it provides and whether you should be looking at enabling it in your network. ![]() This guide covers what port aggregation / link aggregation (LAG) is and how to enable and use it within UniFi.
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