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IEEE 802.1D 4th Edition, March 31, 2011
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STANDARD FOR LOCAL AND METROPOLITAN AREA NETWORKS MEDIA ACCESS CONTROL (MAC) BRIDGES
Includes all amendments and changes through Amendment 5, March 22, 2007
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For the purpose of compatible interconnection of data-processing equipment using the IEEE 802 MAC Service supported by interconnected IEEE 802 LANs (see 3.4) using different or identical Media Access Control methods, this standard specifies a general method for the operation of MAC Bridges. To this end this standard

a) Positions the bridging function within an architectural description of the MAC Sublayer.

b) Defines the principles of operation of the MAC Bridge in terms of the support and preservation of the MAC Service, and the maintenance of QoS.

c) Specifies the MAC Internal Sublayer Service provided by individual LANs to the Media Access Method Independent Functions that provide frame relay in the Bridge.

d) Identifies the functions to be performed by Bridges, and provides an architectural model of the internal operation of a Bridge in terms of Processes and Entities that provide those functions.

e) Establishes the requirements for a protocol between the Bridges in a Bridged Local Area Network to configure the network, and specifies the distributed computation of a Spanning Tree active topology.

f) Establishes the requirements for a protocol between Bridges in a Bridged Local Area Network to configure multicast filtering information, and specifies the means of registering and distributing multicast filtering information by means of the GARP Multicast Registration Protocol (GMRP).

g) Establishes the requirements for Bridge Management in the Bridged Local Area Network, identifying the managed objects and defining the management operations.

h) Specifies performance requirements and recommends default values and applicable ranges for the operational parameters of a Bridge.

i) Specifies the requirements to be satisfied by equipment claiming conformance to this standard.

j) Specifies criteria for the use of MAC-specific bridging methods.

This standard specifies the operation of MAC Bridges that attach directly to IEEE 802 LANs, as specified in the relevant MAC standards for the MAC technology or technologies implemented.