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August 01, 2011
Scalability and Fault Tolerance with Link Aggregation
By Joe Purcell
Link aggregation is a great networking trick to achieve network scalability and fault tolerance. Let's take a look at the general concepts of how link aggregation is setup and the benefits and restrictions that apply.

The Link Aggregation Control Protocol (LACP) was established as an open protocol by IEEE 802.3ad in 2000. However, the most popular solutions are proprietary, such as Cisco's EtherChannel. The aggregation technique can be used on the three lower tiers of the OSI model: physical, data link, or network layers. The idea is to combine physical ports between switches to create a single channel.

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