IEEE 802.1D

802.1D is the IEEE MAC

Media Access Control

The media access control data communication protocol sub-layer, also known as the medium access control, is a sublayer of the data link layer specified in the seven-layer OSI model , and in the four-layer TCP/IP model...

 Bridges standard which includes Bridging

Bridging (networking)

Bridging is a forwarding technique used in packet-switched computer networks. Unlike routing, bridging makes no assumptions about where in a network a particular address is located. Instead, it depends on flooding and examination of source addresses in received packet headers to locate unknown...

, Spanning Tree

Spanning tree protocol

The Spanning Tree Protocol is a network protocol that ensures a loop-free topology for any bridged Ethernet local area network. The basic function of STP is to prevent bridge loops and ensuing broadcast radiation...

 and others. It is standardized by the IEEE 802.1

IEEE 802.1

IEEE 802.1 is a working group of the IEEE 802 project of the IEEE Standards Association.It is concerned with:* 802 LAN/MAN architecture* internetworking among 802 LANs, MANs and other wide area networks* 802 Link Security* 802 overall network management...

 working group. It includes details specific to linking many of the other 802 projects including the widely deployed 802.3 (ethernet), 802.11 (WiFi) and 802.16 (WiMax) standards.

VLANs (virtual LANs) are not part of 802.1D, but specified in 802.1Q

IEEE 802.1Q

IEEE 802.1Q is the networking standard that supports Virtual LANs on an Ethernet network. The standard defines a system of VLAN tagging for Ethernet frames and the accompanying procedures to be used by bridges and switches in handling such frames...

.

Publishing history:

• 1990 — Original publication (802.1D-1990), based on the ISO/IEC 10038 standard
• 1998 — Revised version (802.1D-1998), incorporating the extensions 802.1p
  IEEE 802.1p
  IEEE P802.1p is the name of a task group active during 1995–98 responsible for adding traffic class expediting and dynamic multicast filtering to the IEEE 802.1D standard. Essentially, they provided a mechanism for implementing Quality of Service at the Media Access Control level...
  
  , P802.12e, 802.1j and 802.6k.
• 2004 — Revised version (802.1D-2004), incorporating the extensions 802.11c, 802.1t and 802.1w, which were separately published in 2001, and removing the original Spanning tree protocol
  Spanning tree protocol
  The Spanning Tree Protocol is a network protocol that ensures a loop-free topology for any bridged Ethernet local area network. The basic function of STP is to prevent bridge loops and ensuing broadcast radiation...
  
  , instead incorporating the Rapid Spanning Tree Protocol (RSTP) from 802.1w.
  • 2004 — Small amendment to add in 802.17 bridging support
  • 2007 — Small amendment to add in 802.16 bridging support

See also

• Spanning tree protocol
  Spanning tree protocol
  The Spanning Tree Protocol is a network protocol that ensures a loop-free topology for any bridged Ethernet local area network. The basic function of STP is to prevent bridge loops and ensuing broadcast radiation...
  
  
• Multiple Spanning Tree Protocol
• IEEE 802.1
  IEEE 802.1
  IEEE 802.1 is a working group of the IEEE 802 project of the IEEE Standards Association.It is concerned with:* 802 LAN/MAN architecture* internetworking among 802 LANs, MANs and other wide area networks* 802 Link Security* 802 overall network management...