Trunking is connecting switched together so that they can share VLAN information between them.
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In telecommunications, trunking is a technology for providing network access to multiple clients simultaneously by sharing a set of circuits, carriers, channels, or frequencies, instead of providing individual circuits or channels for each client. This is reminiscent to the structure of a tree with one trunk and many branches. Trunking in telecommunication originated in telegraphy, and later in telephone systems, but other applications include the two-way radios commonly used by police agencies. In the form of link aggregation and VLAN tagging, trunking has been applied in computer networking.
A trunk is a communications channel between switching centers. In traffic engineering, a trunk line is a major passage, such as a highway, railroad, or airline, between geographic locations.
