The Spanning Tree Protocol (STP) and its variants (Rapid STP, Multiple STP and Extended STP) are network layer (ISO-OSI Layer 3) protocols intended to provide a loop free topology for bridged local area networks (LANs). STP is used almost exclusively in all local area networks. Since the proper functioning of the STP is vital to modern infrastructure and society, the dependability of STP implementations must be verified. STP Tester is capable of testing STP implementations for security flaws and robustness problems.
802.1Q-2014 - IEEE Standard for Local and metropolitan area networks--Bridges and Bridged Networks
IEEE Standard for local and metropolitan area networks - Common specifications Part 3: Media Access Control (MAC) Bridges
IEEE Standard for local and metropolitan area networks - Media Access Control (MAC) Bridges
IEEE Standard for local and metropolitan area networks - Virtual Bridged Local Area Networks
IEEE Standard for local and metropolitan area networks - Common specifications Part 5: Media Access Control (MAC) bridging