IEEE 802.1Q-1998 pdf download IEEE Standards for Local and Metropolitan Area Networks: Virtual Bridged Local Area Networks
1. Overview
IEEE 802 Local Area Networks (LANs) of all types can be connected together with Media Access Control(MAC) Bridges, as specified in ISO/IEC 15802-3′, This standard defines the operation of Virtual LAN(VLAN; see 3.16) Bridges that permit the definition, operation, and administration of VLAN topologieswithin a Bridged LAN (see 3.20) infrastructure.
1.1 Scope
For the purpose of compatible interconnection of information technology equipment using the IEEE 802 MAC Service supported by interconnected IEEE 802 standard LANs using different or identical MAC meth- ods, this standard specifies a general method for the operation of MAC Bridges that support the construction of VLANs (see 3.16). To this end it
a) Positions the function of VLANs within an architectural description of the MAC Sublayer;
b) Defines enhancements to the Support of the MAC Service, as described and defined in ISO/IEC 15802-3, for the purposes of VLAN Bridging;
c) Specifies an Enhanced Internal Sublayer Service provided to the Media Access Independent functions that provide frame relay (3.4) in the VLAN Bridge;
d) Specifies the operation of the functions that provide frame relay in the VLAN Bridge;
e) Defines the structure, encoding, and interpretation of the VLAN control information carried in tagged frames (3.12) in a VLAN;
f) Specifies the rules that govern the insertion and removal of VLAN control information in frames;
g) Specifies the rules that govern the ability to carry data in Canonical format and Non-canonical format using different LAN MAC methods;
NOTE—The meanings of the terms Canonical format and Non-canonical format are discussed in Annex F.
h) Establishes the requirements for, and specifies the means of, automatic configuration of VLAN topology information;
i) Defines the management functionality that may be provided in a VLAN Bridge in order to facilitate administrative control over VLAN operation;
j) Specifies the requirements to be satisfied by equipment claiming conformance to this standard.
1.2 VLAN aims and benefits
VLANs aim to offer the following benefits:
a) VLANs are supported over all IEEE 802 LAN MAC protocols, and over shared media LANs as well as point-to-point LANs.
b) VLANs facilitate easy administration of logical groups of stations that can communicate as if they were on the same LAN. They also facilitate easier administration of moves, adds, and changes in members of these groups.
c) Traffic between VLANs is restricted. Bridges forward unicast, multicast, and broadcast traffic only on LAN segments that serve the VLAN to which the traffic belongs.
d) As far as possible, VLANs maintain compatibility with existing bridges and end stations.
e) If all Bridge Ports are configured to transmit and receive untagged frames (3.14), bridges will work in plug-and-play ISO/IEC 15802-3 mode. End stations will be able to communicate throughout the Bridged LAN.
IEEE 802.1Q-1998 pdf download
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