VP (Virtual Path) 1. In SDH and SONET specifications, an end-to-end path that is temporary in nature, which is to say that the path between two endpoints can change from one connection to another. The VP also is shared among multiple calls. See also path, SDH, and SONET. 2. In packet networks, a group of virtual circuits (VCs) sharing the same endpoints. See also packet-switching and VC. |