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Terminology
Link Aggregation:
It is a method to have multiple physical links with the same media and speed
bundled to be a logical link forming a Link Aggregation Group with a group ID. With
the viewpoint of MAC client, each Link Aggregation Group is an independent link.
There are three cases of link used in the network, which are switch to switch,
switch to station and station to station. Here station may be a host or a router.
Link Aggregation, called port trunking sometimes, has two types of link
configuration, including static port trunk and dynamic port trunk.
Static Port Trunk:
When physical links are changed, administrator needs to manually
configure the switches one by one.
Dynamic Port Trunk:
When physical links are changed, LACP takes over and automatically
reconfigure. Administrator does not have to do anything and may see the
trap message of LACP changed in NMS.
Fig. 3-10 Example of Link Aggregation Application