With Link Aggregation, each individual link can be configured to carry a separate class of traffic (like voice) if desired, using QoS parameters. So, the traffic is split evenly between the various links which ensures its effective utilization. Link Aggregation can also do load balancing among the various links in the Link Aggregation Group. All the aggregated links need to operate at the same speed (100 Mbps or 1GE or 10GE).
You can Link Aggregate two copper links (or) two single more fiber links (or) two multi mode fiber links (a combination of copper/ fiber is not allowed though). So, this gives cable level redundancy for all the interconnections made using Link Aggregation protocol. More importantly, as multiple links connect from one switch to another using Link Aggregation, if one link fails, the traffic would continue to flow through the other link(s).
Compare this with replacing all the switches with newer ones and getting a 10x increase in throughput which may not be fully utilized.
#WHAT DOES A LAG SWITCH DO UPGRADE#
In case you want to upgrade the network backbone, this method of connecting the switches using Link Aggregation not only uses the existing switches, but also gives a 2x,3x… higher backbone throughput. For example, if two 1 GE ports from two switches connect to each other using Link Aggregation, we get a single virtual 2 GE port. The main advantage of doing this is the higher capacity obtained from each group of aggregated links. Similarly, two (or more) links from two (or more) ports from a server can also connect to two (or more) switch ports to form a bigger link. It can be either two links from two ports of each switch connecting to another switch as shown in the above diagram, or multiple links from multiple ports. Link Aggregation is a very useful method to combine multiple links to form a single (bigger) link. Extending your network using Link Aggregation: Link Aggregation and its advantages:
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