UniFi Network - Link Aggregation (LAG) FAQs

What is the benefit of LAG? 

LAG can increase maximum throughput, and allow for network redundancy. It does this by splitting traffic across multiple ports instead of forcing clients to use a single uplink port on a switch. Note that these performance improvements will only occur when multiple clients are passing traffic simultaneously through the LAG.

Who may be interested in using LAG?

Most home-users do not need this, but those with a NAS may experience improved throughput. Various enterprise users will see the benefit both from the increased throughput, as well as the redundancy it provides.

What devices support LAG?

All UniFi Switches support LAG except the following: USW-Flex, USW-Flex-Mini and USW-Ultra.

LAGs are not supported on UniFi Gateways. Because of this, you should not aggregate two ports connected from a UniFi Switch to a UniFi Gateway.

What are the limitations of LAG?

  • Ports must be sequential in number.
  • Static LAG configurations are not supported, only LACP (802.3ad).
  • Multi-chassis Link Aggregation Group (MLAG) is not supported.

In what order should I configure LAG on my switches?

When enabling the LAG, you should be certain that configuration changes are first done on the most downstream switch, and then move upstream towards your UniFi Console.

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