netman 2008-4-13 19:41
802.1Q-2005(Incorporates 802.1Q-1998, 802.1u-2001,802.1v-2001,802.1s-2002)
【资料成文时间】： 19 May 2006
【语言】：English
【页数】： 303
【何人（公司）所著】：IEEE
【文件格式】： PDF
【文件原名】：Virtual Bridged Local Area Networks
【摘要或目录】：
Contents
1. Overview.................................................................................................................................................... 1
1.1 Scope........................................................................................................................................... 1
1.2 VLAN aims and benefits ............................................................................................................. 2
2. Normative references ................................................................................................................................. 3
3. Definitions ................................................................................................................................................. 5
4. Abbreviations............................................................................................................................................. 9
5. Conformance............................................................................................................................................ 11
5.1 Requirements terminology......................................................................................................... 11
5.2 Protocol Implementation Conformance Statement (PICS)........................................................ 11
5.3 VLAN-aware Bridge requirements............................................................................................ 11
5.4 MAC-specific bridging methods ............................................................................................... 13
6. Support of the MAC Service in VLANs................................................................................................... 15
6.1 Support of the MAC service ...................................................................................................... 15
6.2 Preservation of the MAC service............................................................................................... 16
6.3 Quality of service maintenance.................................................................................................. 16
6.4 Internal Sublayer Service........................................................................................................... 21
6.5 Support of the Internal Sublayer Service by specific MAC procedures.................................... 23
6.6 Enhanced Internal Sublayer Service .......................................................................................... 25
6.7 Support of the EISS ................................................................................................................... 26
6.8 Protocol VLAN classification.................................................................................................... 29
7. Principles of network operation ................................................................................................................ 33
7.1 Network overview...................................................................................................................... 33
7.2 Use of VLANs ........................................................................................................................... 34
7.3 VLAN topology ......................................................................................................................... 35
7.4 Locating end stations ................................................................................................................. 35
7.5 Ingress, forwarding, and egress rules......................................................................................... 37
8. Principles of bridge operation................................................................................................................... 38
8.1 Bridge operation ........................................................................................................................ 38
8.2 Bridge architecture.................................................................................................................... 41
8.3 Model of operation..................................................................................................................... 42
8.4 Port states and the active topology ............................................................................................ 44
8.5 Bridge Port Transmit and Receive............................................................................................. 45
8.6 The Forwarding Process ............................................................................................................ 47
8.7 The Learning Process................................................................................................................. 51
8.8 The Filtering Database............................................................................................................... 52
8.9 MST configuration information................................................................................................. 65
8.10 Spanning Tree Protocol Entity.................................................................................................. 66
8.11 GARP Entities.......................................................................................................................... 66
8.12 Bridge Management Entity....................................................................................................... 66
8.13 Addressing ............................................................................................................................... 67
xiv Copyright © 2006 IEEE. All rights reserved.
9. Tagged frame format ............................................................................................................................... 74
9.1 Purpose of tagging ..................................................................................................................... 74
9.2 Representation and encoding of tag fields................................................................................. 74
9.3 Tag format................................................................................................................................. 75
9.4 Tag Protocol Identifier (TPID) formats ..................................................................................... 75
9.5 Tag Protocol Identification ........................................................................................................ 75
9.6 VLAN Tag Control Information................................................................................................ 76
9.7 Embedded Routing Information Field (E-RIF) ......................................................................... 77
10. Use of GMRP in VLANs........................................................................................................................ 79
10.1 Definition of a VLAN Context .................................................................................................. 79
10.2 GMRP Participants and GIP Contexts....................................................................................... 79
10.3 Context identification in GMRP PDUs ..................................................................................... 80
10.4 Default Group filtering behavior and GMRP propagation ........................................................ 80
11. VLAN topology management................................................................................................................. 82
11.1 Static and dynamic VLAN configuration .................................................................................. 82
11.2 GARP VLAN Registration Protocol.......................................................................................... 83
11.3 Conformance to GVRP.............................................................................................................. 88
11.4 Procedural model ....................................................................................................................... 89
12. Bridge management ............................................................................................................................... 90
12.1 Management functions............................................................................................................... 90
12.2 Managed objects ........................................................................................................................ 91
12.3 Data types ................................................................................................................................. 91
12.4 Bridge Management Entity........................................................................................................ 92
12.5 MAC entities............................................................................................................................. 95
12.6 Forwarding process.................................................................................................................... 95
12.7 Filtering Database ...................................................................................................................... 99
12.8 Bridge Protocol Entity ............................................................................................................. 104
12.9 GARP Entities..........................................................................................................................111
12.10 Bridge VLAN managed objects..............................................................................................114
12.11 GMRP entities....................................................................................................................... 124
12.12 MST configuration entities .................................................................................................... 126
13. The Multiple Spanning Tree Protocol (MSTP) .................................................................................... 131
13.1 Protocol design requirements................................................................................................... 131
13.2 Protocol support requirements ................................................................................................. 132
13.3 MSTP overview ....................................................................................................................... 132
13.4 Relationship of MSTP to RSTP............................................................................................... 138
13.5 Modeling an MST Region as a single RSTP Bridge ............................................................... 139
13.6 STP and RSTP compatibility................................................................................................... 140
13.7 MST Configuration Identification ........................................................................................... 141
13.8 MST Regions ........................................................................................................................... 142
13.9 Spanning Tree Priority Vectors ............................................................................................... 143
13.10 CIST Priority Vector calculations.......................................................................................... 144
13.11 MST Priority Vector calculations .......................................................................................... 146
13.12 Port Role assignments............................................................................................................ 148
13.13 Stable connectivity................................................................................................................. 148
Copyright © 2006 IEEE. All rights reserved. xv
13.14 Communicating Spanning Tree information ......................................................................... 150
13.15 Changing Spanning Tree information.................................................................................... 151
13.16 Changing Port States.............................................................................................................. 152
13.17 Updating learned station location information ...................................................................... 157
13.18 MSTP and point-to-point links .............................................................................................. 158
13.19 Multiple Spanning Tree state machines................................................................................. 158
13.20 Notational conventions used in state diagrams...................................................................... 160
13.21 State machine timers.............................................................................................................. 160
13.22 MSTP performance parameters ............................................................................................. 161
13.23 Per-Bridge variables .............................................................................................................. 162
13.24 Per-Port variables................................................................................................................... 164
13.25 State machine conditions and parameters .............................................................................. 169
13.26 State machine procedures ...................................................................................................... 172
13.27 The Port Timers state machine .............................................................................................. 179
13.28 Port Receive state machine .................................................................................................... 179
13.29 Port Protocol Migration state machine .................................................................................. 180
13.30 Bridge Detection state machine ............................................................................................. 180
13.31 Port Transmit state machine .................................................................................................. 180
13.32 Port Information state machine.............................................................................................. 182
13.33 Port Role Selection state machine ......................................................................................... 183
13.34 Port Role Transitions state machine ...................................................................................... 183
13.35 Port State Transition state machine ....................................................................................... 187
13.36 Topology Change state machine............................................................................................ 187
13.37 Performance ........................................................................................................................... 188
14. Use of BPDUs by MSTP ...................................................................................................................... 190
14.1 BPDU Structure ....................................................................................................................... 190
14.2 Encoding of parameter types ................................................................................................... 190
14.3 BPDU formats and parameters ................................................................................................ 192
14.4 Validation of received BPDUs ................................................................................................ 193
14.5 Transmission of BPDUs .......................................................................................................... 193
14.6 Encoding and decoding of STP Configuration, RST, and MST BPDUs ................................ 194
Annex A (normative) PICS proforma.......................................................................................................... 197
Annex B (informative) Shared and Independent VLAN Learning.............................................................. 225
Annex C (informative) MAC method dependent aspects of VLAN support .............................................. 233
Annex D (informative) Background to VLANs .......................................................................................... 265
Annex E (informative) Interoperability considerations ............................................................................... 266
Annex F (informative) Frame translation considerations ............................................................................ 278
Annex G (informative) Priority ................................................................................................................... 279
Annex H (informative) Bibliography .......................................................................................................... 284