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IEEE 802.1G
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IEEE 802.1G 1998 Edition, March 13, 1998 Information Technology - Telecommunications and Information Exchange between Systems - Local and Metropolitan Area Networks - Common Specifications - Part 5: Remote Media Access Control (MAC) Bridging
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Description / Abstract:
ISO/IEC 8802 local area networks (LANs) of all types can be connected together using MAC bridges. Each individual LAN has its own independent MAC. The bridged LAN created allows the interconnection of stations as if they were attached to a single LAN, although they are in fact attached to separate LANs each with its own MAC. A MAC bridge operates below the MAC service boundary, and is largely transparent to protocols operating above this boundary, in the Logical Link Control (LLC) sublayer or Network layer. The presence of one or more MAC bridges can lead to differences in the quality of service provided by the MAC sublayer; it is only because of such differences that MAC bridge operation is not fully transparent.
A bridged LAN can provide for
— The interconnection of stations attached to LANs of different MAC types.
— An effective increase in the physical extent, the number of permissible attachments, or the total performance of a LAN.
— Partitioning of the physical LAN for administrative or maintenance reasons.
Local MAC bridges interconnect separate LANs, at geographically close points of attachment. Remote MAC bridges, which can be geographically separated, interconnect LANs sited locally to the individual remote MAC bridges, using non-LAN technologies for communication among the remote bridges. A given piece of equipment can be a local MAC bridge or remote MAC bridge, only, or it can combine the functions of a local MAC bridge and a remote MAC bridge.
A bridged LAN can provide for
— The interconnection of stations attached to LANs of different MAC types.
— An effective increase in the physical extent, the number of permissible attachments, or the total performance of a LAN.
— Partitioning of the physical LAN for administrative or maintenance reasons.
Local MAC bridges interconnect separate LANs, at geographically close points of attachment. Remote MAC bridges, which can be geographically separated, interconnect LANs sited locally to the individual remote MAC bridges, using non-LAN technologies for communication among the remote bridges. A given piece of equipment can be a local MAC bridge or remote MAC bridge, only, or it can combine the functions of a local MAC bridge and a remote MAC bridge.