What Is Ethernet Link Aggregation
As broadband services are widely used, carriers require higher bandwidth and reliability for Ethernet links.
- 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.
A logical link aggregating several physical links is called a LAG.
NOTE:As shown in Figure 1-1, two devices are interconnected through several pairs of Ethernet ports. These ports are bound into a logical link, called a LAG.




