Hardware upgrades can increase Ethernet link bandwidth but at high
costs. In addition, hardware upgrades are less flexible than software upgrades.
Ethernet link aggregation addresses these issues and supports the following
functions:
A logical link aggregating several physical links is called a LAG.- The maximum bandwidth of a link aggregation group (LAG) is equal to the total bandwidths of all links in a LAG. Hardware upgrades are not required and costs are curtailed.
- Traffic in a LAG is distributed to member links using the load sharing algorithm, implementing load sharing and improving link usage.
- Member links in a LAG dynamically back up each other. When one link is interrupted, a bakckup link immediately takes over.
- Link aggregation functions between interconnected devices only and is independent of the network topology.
Link aggregation is also called port aggregation because
each link corresponds to two specific ports on an Ethernet network.
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