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IEEE 802.1D is the Ethernet MAC bridges standard which includes bridging, Spanning Tree Protocol and others. It is standardized by the IEEE 802.1 working group. It includes details specific to linking many of the other 802 projects including the widely deployed 802.3 (Ethernet), 802.11 (Wireless LAN) and 802.16 (WiMax) standards.
The original Perlman-inspired Spanning Tree Protocol, called DEC STP, is not a standard and differs from the IEEE version in message format as well as timer settings. Some bridges implement both the IEEE and the DEC versions of the Spanning Tree Protocol, but their interworking can create issues for the network administrator. [16]
It was originally defined in IEEE 802.1s as an amendment to 802.1Q, 1998 edition and later merged into IEEE 802.1Q-2005 Standard, clearly defines an extension or an evolution of Radia Perlman's Spanning Tree Protocol (STP) and the Rapid Spanning Tree Protocol (RSTP).
Superseded by 802.1D-2004 P802.1r GARP Proprietary Attribute Registration Protocol (GPRP) Withdrawn 802.1t-2001 Technical and Editorial corrections for 802.1D-1998 Incorporated into 802.1D-2004 802.1w-2001: Rapid Reconfiguration of Spanning Tree Incorporated into 802.1D-2004 P802.1y Maintenance to 802.1D-1998 Merged into 802.1D-2004 802.1D-2004
IEEE 802.1D – Standard which includes bridging, Spanning Tree Protocol and others IEEE 802.1Q – IEEE networking standard supporting VLANs IEEE 802.1ah-2008 – Standard for bridging over a provider's network Pages displaying short descriptions of redirect targets
Spanning-Tree Protocol (STP) resolves redundant physical topology into a loop-free, tree-like forwarding topology via blocking one or more ports. However, Unidirectional Link failure can cause "traffic blackholing" and loops in the Switch topology.
IEEE 802.1aq is an amendment to the IEEE 802.1Q networking standard which adds support for Shortest Path Bridging (SPB).This technology is intended to simplify the creation and configuration of Ethernet networks while enabling multipath routing.
IEEE 802 is a family of Institute of Electrical and Electronics Engineers (IEEE) standards for local area networks (LANs), personal area networks (PANs), and metropolitan area networks (MANs). The IEEE 802 LAN/MAN Standards Committee (LMSC) maintains these standards.