IEEE 802.1Q 2012

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IEEE Standard for Local and metropolitan area networks–Media Access Control (MAC) Bridges and Virtual Bridges

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IEEE	2012	1782

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Description

– Active. This standard specifies how the MAC Service is supported by Virtual Bridged Local Area Networks, the principles of operation of those networks, and the operation of VLAN-aware Bridges, including management, protocols, and algorithms. It Incorporates: IEEE Std 802.1Q-2011, IEEE Std 802.1Qbe-2011, IEEE Std 802.1Qbc-2011,IEEE Std 802.1Qbb-2011, IEEE Std 802.1Qaz-2011, IEEE Std 802.1Qbf-2011,IEEE Std 802.1Qbg-2012, IEEE Std 802.1aq-2012, and IEEE Std 802.1Q-2011/Cor 2-2012)

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PDF Pages	PDF Title
1	IEEE Std 802.1Q™, 2012 Edition
15	Contents
48	Figures
55	Tables
61	IMPORTANT NOTICE 1. Overview
62	1.1 Scope 1.2 Purpose 1.3 Introduction
68	1.4 VLAN aims and benefits
70	2. Normative references
74	3. Definitions
92	4. Abbreviations
97	5. Conformance 5.1 Requirements terminology 5.2 Conformant components and equipment
98	5.3 Protocol Implementation Conformance Statement (PICS) 5.4 VLAN-aware Bridge component requirements
105	5.5 C-VLAN component conformance 5.6 S-VLAN component conformance
106	5.7 I-component conformance
107	5.8 B-component conformance
108	5.9 VLAN Bridge conformance 5.10 Provider Bridge conformance
109	5.11 System requirements for Priority-based Flow Control
110	5.12 Backbone Edge Bridge conformance 5.13 VLAN-unaware Bridge component requirements 5.14 TPMR component conformance
111	5.15 TPMR conformance
112	5.16 T-component conformance 5.17 End station requirements for MMRP, MVRP, and MSRP
114	5.18 VLAN-aware end station requirements for Connectivity Fault Management 5.19 End station requirements—forwarding and queuing for time-sensitive streams
115	5.20 End station requirements for congestion notification 5.21 MAC-specific bridging methods
116	5.22 Edge Virtual Bridging (EVB) Bridge requirements 5.23 Edge Virtual Bridging (EVB) station requirements
119	6. Support of the MAC Service
120	6.1 Basic architectural concepts and terms
123	6.2 Provision of the MAC service
124	6.3 Support of the MAC service
125	6.4 Preservation of the MAC service 6.5 Quality of service maintenance
131	6.6 Internal Sublayer Service
135	6.7 Support of the Internal Sublayer Service by specific MAC procedures
141	6.8 Enhanced Internal Sublayer Service
143	6.9 Support of the EISS
148	6.10 Support of the ISS/EISS by Provider Instance Ports
152	6.11 Support of the EISS by Customer Backbone Ports
155	6.12 Protocol VLAN classification
158	6.13 Support of the ISS for attachment to a Provider Bridged Network
160	6.14 Support of the ISS within a system
161	6.15 Support of the ISS by additional technologies 6.16 Filtering services in Bridged Local Area Networks
164	6.17 EISS Multiplex Entity
165	6.18 Backbone Service Instance Multiplex Entity
169	6.19 TESI Multiplex Entity
170	6.20 Support of the ISS with signaled priority
171	6.21 Infrastructure Segment Multiplex Entity
173	7. Principles of network operation 7.1 Network overview
174	7.2 Use of VLANs 7.3 Active topology
175	7.4 VLAN topology
176	7.5 Locating end stations 7.6 Ingress, forwarding, and egress rules
178	8. Principles of bridge operation 8.1 Bridge operation
181	8.2 Bridge architecture
182	8.3 Model of operation
185	8.4 Active topologies, learning, and forwarding
186	8.5 Bridge Port Transmit and Receive
189	8.6 The Forwarding Process
200	8.7 The Learning Process
201	8.8 The Filtering Database
214	8.9 MST, SPB, and ESP configuration information
216	8.10 Spanning Tree Protocol Entity
217	8.11 MRP Entities 8.12 Bridge Management Entity 8.13 Addressing
228	9. Tagged frame format 9.1 Purpose of tagging 9.2 Representation and encoding of tag fields
229	9.3 Tag format 9.4 Tag Protocol Identifier (TPID) formats 9.5 Tag Protocol Identification
230	9.6 VLAN Tag Control Information
231	9.7 Backbone Service Instance Tag Control Information
233	10. Multiple Registration Protocol (MRP) and Multiple MAC Registration Protocol (MMRP) 10.1 MRP overview
236	10.2 MRP architecture
237	10.3 MRP Attribute Propagation (MAP)
239	10.4 Requirements to be met by MRP 10.5 Requirements for interoperability between MRP Participants
241	10.6 Protocol operation
245	10.7 Protocol specification
259	10.8 Structure and encoding of MRP Protocol Data Units
266	10.9 Multiple MAC Registration Protocol (MMRP)—Purpose
267	10.10 Model of operation
270	10.11 Default Group filtering behavior and MMRP propagation
271	10.12 Definition of the MMRP application
276	11. VLAN topology management 11.1 Static and dynamic VLAN configuration
277	11.2 Multiple VLAN Registration Protocol
285	12. Bridge management 12.1 Management functions
286	12.2 VLAN-aware bridge objects
287	12.3 Data types
288	12.4 Bridge Management Entity
293	12.5 MAC entities 12.6 Forwarding process
303	12.7 Filtering Database
308	12.8 Bridge Protocol Entity
315	12.9 MRP Entities
317	12.10 Bridge VLAN managed objects
329	12.11 MMRP entities
330	12.12 MST configuration entities
335	12.13 Provider Bridge management
342	12.14 CFM entities
359	12.15 Backbone Core Bridge management 12.16 Backbone Edge Bridge management
374	12.17 DDCFM entities
385	12.18 PBB-TE Protection Switching managed objects
388	12.19 TPMR managed objects
398	12.20 Management entities for forwarding and queueing for time-sensitive streams
399	12.21 Congestion notification managed objects
404	12.22 SRP entities
406	12.23 Priority-based Flow Control objects
407	12.24 1:1 PBB-TE Infrastructure Protection Switching (IPS) managed objects
411	12.25 Shortest Path Bridging managed objects
425	12.26 Edge Virtual Bridging management
438	12.27 Edge Control Protocol management
439	13. Spanning Tree Protocols
440	13.1 Protocol design requirements
441	13.2 Protocol support requirements
442	13.3 Protocol design goals 13.4 RSTP overview
448	13.5 MSTP overview
453	13.6 SPB overview
454	13.7 Compatibility and interoperability
455	13.8 MST Configuration Identifier
456	13.9 Spanning Tree Priority Vectors
458	13.10 CIST Priority Vector calculations
460	13.11 MST Priority Vector calculations
462	13.12 Port Role assignments
463	13.13 Stable connectivity
464	13.14 Communicating Spanning Tree information
465	13.15 Changing Spanning Tree information
466	13.16 Changing Port States with RSTP or MSTP
471	13.17 Changing Port States with SPB
473	13.18 Managing spanning tree topologies
475	13.19 Updating learned station location information
477	13.20 Managing reconfiguration
478	13.21 Partial and disputed connectivity 13.22 In-service upgrades
479	13.23 Fragile bridges
480	13.24 Spanning tree protocol state machines
482	13.25 State machine timers
484	13.26 Per bridge variables
486	13.27 Per port variables
497	13.28 State machine conditions and parameters
500	13.29 State machine procedures
511	13.30 The Port Timers state machine
512	13.31 Port Receive state machine
513	13.32 Port Protocol Migration state machine 13.33 Bridge Detection state machine 13.34 Port Transmit state machine
515	13.35 Port Information state machine
516	13.36 Port Role Selection state machine 13.37 Port Role Transitions state machine
520	13.38 Port State Transition state machine
522	13.39 Topology Change state machine
523	13.40 Layer 2 Gateway Port Receive state machine 13.41 Customer Edge Port Spanning Tree operation
525	13.42 Virtual Instance Port Spanning Tree operation
526	14. Encoding of Bridge Protocol Data Units (BPDUs) 14.1 BPDU Structure
528	14.2 Encoding of parameter types
530	14.3 Transmission of BPDUs
531	14.4 Encoding and decoding of STP Configuration, RST, MST, and SPT BPDUs
533	14.5 Validation of received BPDUs
534	14.6 Validation and interoperability
536	15. Support of the MAC Service by Provider Bridged Networks 15.1 Service transparency
537	15.2 Customer service interfaces 15.3 Port-based service interface
538	15.4 C-tagged service interface
539	15.5 S-tagged service interface
540	15.6 Remote customer service interfaces
543	15.7 Service instance segregation 15.8 Service instance selection and identification
544	15.9 Service priority selection
545	15.10 Service access protection 15.11 Connectivity Fault Management 15.12 Data-driven and data-dependent connectivity fault management (DDCFM)
546	16. Principles of Provider Bridged Network operation 16.1 Provider Bridged Network overview
547	16.2 Provider Bridged Network
550	16.3 Service instance connectivity
551	16.4 Service provider learning of customer end station addresses 16.5 Detection of connectivity loops through attached networks
552	16.6 Network management
553	17. Management Information Base (MIB) 17.1 Internet Standard Management Framework 17.2 Structure of the MIB
607	17.3 Relationship to other MIBs Relationship to other MIBs
618	17.4 Security considerations
632	17.5 Dynamic component and Port creation
645	17.6 MIB operations for service interface configuration
655	17.7 MIB modules
1110	18. Principles of Connectivity Fault Management operation
1111	18.1 Maintenance Domains and Domain Service Access Points
1113	18.2 Service instances and Maintenance Associations
1114	18.3 Maintenance Domain Levels
1118	19. Connectivity Fault Management Entity operation 19.1 Maintenance Points 19.2 Maintenance association End Point
1125	19.3 MIP Half Function
1128	19.4 Maintenance Point addressing 19.5 Linktrace Output Multiplexer
1129	19.6 Linktrace Responder
1131	20. Connectivity Fault Management protocols
1132	20.1 Continuity Check protocol
1135	20.2 Loopback protocol
1137	20.3 Linktrace protocol
1141	20.4 Connectivity Fault Management state machines 20.5 CFM state machine timers
1143	20.6 CFM procedures
1144	20.7 Maintenance Domain variable 20.8 Maintenance Association variables 20.9 MEP variables
1146	20.10 MEP Continuity Check Initiator variables
1147	20.11 MEP Continuity Check Initiator procedures
1148	20.12 MEP Continuity Check Initiator state machine 20.13 MHF Continuity Check Receiver variables
1149	20.14 MHF Continuity Check Receiver procedures 20.15 MHF Continuity Check Receiver state machine
1150	20.16 MEP Continuity Check Receiver variables
1152	20.17 MEP Continuity Check Receiver procedures
1153	20.18 MEP Continuity Check Receiver state machine 20.19 Remote MEP variables
1155	20.20 Remote MEP state machine 20.21 Remote MEP Error variables
1156	20.22 Remote MEP Error state machine 20.23 MEP Cross Connect variables
1157	20.24 MEP Cross Connect state machine 20.25 MEP Mismatch variables
1158	20.26 MEP Mismatch state machines 20.27 MP Loopback Responder variables
1160	20.28 MP Loopback Responder procedures
1161	20.29 MP Loopback Responder state machine 20.30 MEP Loopback Initiator variables
1162	20.31 MEP Loopback Initiator transmit procedures
1163	20.32 MEP Loopback Initiator transmit state machine 20.33 MEP Loopback Initiator receive procedures
1164	20.34 MEP Loopback Initiator receive state machine 20.35 MEP Fault Notification Generator variables
1166	20.36 MEP Fault Notification Generator procedures 20.37 MEP Fault Notification Generator state machine
1167	20.38 MEP Mismatch Fault Notification Generator variables
1168	20.39 MEP Mismatch Fault Notification Generator procedures 20.40 MEP Mismatch Fault Notification Generator state machine 20.41 MEP Linktrace Initiator variables
1171	20.42 MEP Linktrace Initiator procedures
1172	20.43 MEP Linktrace Initiator receive variables 20.44 MEP Linktrace Initiator receive procedures
1173	20.45 MEP Linktrace Initiator receive state machine 20.46 Linktrace Responder variables
1174	20.47 LTM Receiver procedures
1180	20.48 LTM Receiver state machine 20.49 LTR Transmitter procedure 20.50 LTR Transmitter state machine
1181	20.51 CFM PDU validation and versioning
1184	20.52 PDU identification
1185	20.53 Use of transaction IDs and sequence numbers
1186	21. Encoding of CFM Protocol Data Units 21.1 Structure, representation, and encoding 21.2 CFM encapsulation
1187	21.3 CFM request and indication parameters
1188	21.4 Common CFM Header
1189	21.5 TLV Format
1194	21.6 Continuity Check Message format
1199	21.7 Loopback Message and Loopback Reply formats
1201	21.8 Linktrace Message Format
1203	21.9 Linktrace Reply Format
1209	22. Connectivity Fault Management in systems 22.1 CFM shims in Bridges
1219	22.2 Maintenance Entity creation
1224	22.3 MPs, Ports, and MD Level assignment 22.4 Stations and Connectivity Fault Management
1225	22.5 Scalability of Connectivity Fault Management
1226	22.6 CFM in Provider Bridges
1229	22.7 Management Port MEPs and CFM in the enterprise environment
1231	22.8 Implementing CFM on existing Bridges
1233	23. MAC status propagation
1234	23.1 Model of operation
1236	23.2 MAC status protocol (MSP) overview
1240	23.3 MAC status protocol state machines
1242	23.4 State machine timers 23.5 MSP performance parameters
1243	23.6 State machine variables
1245	23.7 State machine procedures 23.8 Status Transition state machine 23.9 Status Notification state machine 23.10 Receive Process
1246	23.11 Transmit Process 23.12 Management of MSP
1247	23.13 MSPDU transmission, addressing, and protocol identification
1248	23.14 Representation and encoding of octets 23.15 MSPDU structure
1249	23.16 Validation of received MSPDUs 23.17 Other MSP participants
1250	24.
1251	25. Support of the MAC Service by Provider Backbone Bridged Networks
1253	25.1 Service transparency 25.2 Customer service interface
1254	25.3 Port-based service interface
1255	25.4 S-tagged service interface
1257	25.5 I-tagged service interface
1259	25.6 Service instance segregation 25.7 Service instance selection and identification
1260	25.8 Service priority and drop eligibility selection 25.9 Service access protection
1264	25.10 Support of the MAC Service by a PBB-TE Region
1267	25.11 Transparent service interface
1269	26. Principles of Provider Backbone Bridged Network operation 26.1 Provider Backbone Bridged Network overview
1270	26.2 Provider Backbone Bridged Network example
1272	26.3 Backbone VLAN connectivity
1273	26.4 Backbone addressing
1275	26.5 Detection of connectivity loops through attached networks 26.6 Scaling of Provider Backbone Bridges
1276	26.7 Network Management 26.8 Connectivity Fault Management in Provider Backbone Bridges
1284	26.9 Connectivity Fault Management in a PBB-TE Region
1291	26.10 Protection switching for point-to-point TESIs
1300	26.11 Infrastructure Protection Switching in PBB-TE Region
1312	26.12 Mismatch defect
1313	26.13 Signaling VLAN registrations among I-components
1314	27. Shortest Path Bridging (SPB)
1316	27.1 Protocol design requirements
1317	27.2 Protocol support 27.3 Protocol design goals 27.4 ISIS-SPB VLAN configuration
1321	27.5 ISIS-SPB information 27.6 Calculating CIST connectivity
1322	27.7 Connectivity between regions in the same domain
1323	27.8 Calculating SPT connectivity
1324	27.9 Loop prevention 27.10 SPVID and SPSourceID allocation
1326	27.11 Allocation of VIDs to FIDs 27.12 SPBV SPVID translation
1327	27.13 VLAN topology management
1328	27.14 Individual addresses and SPBM
1329	27.15 SPBM group addressing
1330	27.16 Backbone service instance topology management
1331	27.17 Equal cost shortest paths, ECTs, and load spreading 27.18 Using SPBV and SPBM
1335	27.19 Security considerations
1336	28. ISIS-SPB Link State Protocol 28.1 ISIS-SPB control plane MAC
1337	28.2 Formation and maintenance of ISIS-SPB adjacencies
1338	28.3 Loop prevention 28.4 The Agreement Digest
1341	28.5 Symmetric shortest path tie breaking
1342	28.6 Symmetric ECT framework
1343	28.7 Symmetric ECT
1344	28.8 Predefined ECT Algorithm details
1345	28.9 ECT Migration
1346	28.10 MAC Address registration
1347	28.11 Circuit IDs and Port Identifiers 28.12 ISIS-SPB TLVs
1358	29. DDCFM operations and protocols 29.1 Principles of DDCFM operation
1361	29.2 DDCFM Entity operation
1366	29.3 DDCFM protocols
1376	29.4 Encoding of DDCFM Protocol Data Units
1379	30. Principles of congestion notification 30.1 Congestion notification design requirements
1381	30.2 Quantized Congestion Notification protocol
1385	30.3 Congestion Controlled Flow
1386	30.4 Congestion Notification Priority Value 30.5 Congestion Notification Tag 30.6 Congestion Notification Domain
1387	30.7 Multicast data
1388	30.8 Congestion notification and additional tags
1389	31. Congestion notification entity operation 31.1 Congestion aware Bridge Forwarding Process
1390	31.2 Congestion aware end station functions
1396	32. Congestion notification protocol 32.1 Congestion Notification Domain operations
1399	32.2 CN component variables
1400	32.3 Congestion notification per-CNPV variables
1402	32.4 CND defense per-Port per-CNPV variables
1405	32.5 Congestion Notification Domain defense procedures
1406	32.6 Congestion Notification Domain defense state machine 32.7 Congestion notification protocol
1407	32.8 Congestion Point variables
1409	32.9 Congestion Point procedures
1412	32.10 Reaction Point per-Port per-CNPV variables 32.11 Reaction Point group variables
1414	32.12 Reaction Point timer 32.13 Reaction Point variables
1415	32.14 Reaction Point procedures
1417	32.15 RP rate control state machine
1419	32.16 Congestion notification and encapsulation interworking function
1421	33. Encoding of congestion notification Protocol Data Units 33.1 Structure, representation, and encoding 33.2 Congestion Notification Tag format
1422	33.3 Congestion Notification Message
1423	33.4 Congestion Notification Message PDU format
1426	34. Forwarding and queuing for time-sensitive streams 34.1 Overview 34.2 Detection of SRP domains
1427	34.3 The bandwidth availability parameters
1428	34.4 Deriving actual bandwidth requirements from the size of the MSDU
1429	34.5 Mapping priorities to traffic classes for time-sensitive streams
1431	34.6 End station behavior
1433	35. Stream Registration Protocol (SRP)
1434	35.1 Multiple Stream Registration Protocol (MSRP)
1437	35.2 Definition of the MSRP application
1461	36. Priority-based Flow Control 36.1 Priority-based Flow Control operation
1464	36.2 PFC aware system queue functions
1467	37. Enhanced Transmission Selection (ETS) 37.1 Overview 37.2 ETS configuration parameters 37.3 ETS algorithm
1468	37.4 Legacy configuration
1469	38. Data Center Bridging eXchange Protocol (DCBX) 38.1 Overview 38.2 Goals 38.3 Types of DCBX attributes 38.4 DCBX and LLDP
1473	39. Multiple I-SID Registration Protocol 39.1 MIRP overview
1475	39.2 Definition of the MIRP application
1481	40. Edge Virtual Bridging (EVB)
1483	40.1 EVB architecture without S-channels
1484	40.2 EVB architecture with S-channels
1486	40.3 Asymmetric EVB architecture without S-channels
1488	41. VSI discovery and configuration protocol (VDP) 41.1 VSI manager ID TLV definition
1489	41.2 VDP association TLV definitions
1496	41.3 Organizationally defined TLV definitions 41.4 Validation rules for VDP TLVs
1497	41.5 VDP state machines
1504	42. S-Channel Discovery and Configuration Protocol (CDCP) 42.1 CDCP discovery and configuration 42.2 CDCP state machine overview
1505	42.3 CDCP configuration state machine
1506	42.4 CDCP configuration variables
1508	42.5 CDCP configuration procedures
1510	43. Edge Control Protocol (ECP) 43.1 Edge control protocol operation
1511	43.2 Edge Control Sublayer Service (ECSS) 43.3 Edge control protocol (ECP) and state machine
1517	Annex A PICS proforma—Bridge implementations A.1 Introduction A.2 Abbreviations and special symbols
1518	A.3 Instructions for completing the PICS proforma
1520	A.4 PICS proforma for IEEE Std 802.1Q—Bridge implementations
1521	A.5 Major capabilities
1525	A.6 Media Access Control methods
1526	A.7 Relay and filtering of frames
1527	A.8 Basic Filtering Services
1528	A.9 Addressing
1530	A.10 Rapid Spanning Tree Protocol
1532	A.11 BPDU encoding A.12 Implementation parameters
1533	A.13 Performance
1534	A.14 Bridge management
1543	A.15 Remote management
1544	A.16 Expedited traffic classes A.17 Extended Filtering Services A.18 Multiple Spanning Tree Protocol
1546	A.19 VLAN support
1550	A.20 MMRP
1551	A.21 MVRP
1552	A.22 MRP
1553	A.23 Connectivity Fault Management
1559	A.24 Management Information Base (MIB)
1561	A.25 Protection Switching
1562	A.26 Data-driven and data-dependent connectivity fault management A.27 TPMR
1563	A.28 MSP A.29 Forwarding and queuing for time-sensitive streams
1564	A.30 Congestion notification
1565	A.31 Stream Reservation Protocol
1568	A.32 MIRP
1569	A.33 Priority-based Flow Control A.34 Enhanced Transmission Selection
1570	A.35 DCBX A.36 Shortest Path Bridging
1571	A.37 EVB Bridge
1572	A.38 EVB station
1574	A.39 Edge relay
1576	A.40 VEB and VEPA edge relay components
1577	A.41 VDP, CDCP, and ECP
1578	Annex B PICS proforma—End station implementations B.1 Introduction B.2 Abbreviations and special symbols
1579	B.3 Instructions for completing the PICS proforma
1581	B.4 PICS proforma for IEEE Std 802.1Q—End station implementations
1582	B.5 Major capabilities B.6 MMRP
1583	B.7 MVRP
1584	B.8 MRP
1585	B.9 Forwarding and queuing for time-sensitive streams B.10 SRP (Stream Reservation Protocol)
1588	B.11 Congestion notification
1590	Annex C DMN (Designated MSRP Node) Implementations C.1 Designated MSRP nodes on CSNs
1593	C.2 Designated MSRP Node on MoCA
1598	C.3 Designated MSRP Nodes on IEEE 802.11 media
1607	Annex D IEEE 802.1 Organizationally Specific TLVs D.1 Requirements of the IEEE 802.1 Organizationally Specific TLV sets
1608	D.2 Organizationally Specific TLV definitions
1624	D.3 IEEE 802.1 Organizationally Specific TLV management
1625	D.4 IEEE 802.1/LLDP extension MIB
1708	D.5 PICS proforma for IEEE 802.1 Organizationally Specific TLV extensions
1711	Annex E Notational conventions used in state diagrams
1713	Annex F Shared and Independent VLAN Learning F.1 Requirements for Shared and Independent Learning
1722	F.2 Configuring the Global VLAN Learning Constraints
1723	F.3 Interoperability
1725	Annex G MAC method dependent aspects of VLAN support G.1 Example tagged IEEE 802.3 Ethertype-encoded frame format G.2 Padding and frame size considerations
1727	Annex H Interoperability considerations H.1 Requirements for interoperability
1728	H.2 Homogenous IEEE 802.1Q networks
1730	H.3 Heterogeneous networks: Intermixing IEEE 802.1D (D) and IEEE 802.1Q (Q) Bridges
1731	H.4 Heterogeneous networks: GARP and MRP issues
1733	H.5 Intermixing Port-based classification and Port-and-Protocol-based classification or future enhancements in IEEE Std 802.1Q
1735	Annex I Priority and drop precedence I.1 Traffic types
1736	I.2 Managing latency and throughput I.3 Traffic type to traffic class mapping
1738	I.4 Traffic types and priority values
1739	I.5 Supporting the credit-based shaper algorithm
1740	I.6 Supporting drop precedence
1741	I.7 Priority code point allocation I.8 Interoperability
1743	Annex J Connectivity Fault Management protocol design and use J.1 Origin of Connectivity Fault Management J.2 Deployment of Connectivity Fault Management
1744	J.3 MD Level allocation alternative J.4 Relationship of IEEE Std 802.1Q CFM to other standards
1745	J.5 Interpreting Linktrace results
1746	J.6 MP addressing: Individual and Shared MP addresses
1751	Annex K TPMR use cases K.1 Use case 1—TPMR as User to Network Interface (UNI) demarcation device
1752	K.2 Use case 2—TPMRs with aggregated links K.3 Use case 3—Multiple TPMRs
1753	K.4 Special cases
1756	Annex L Operation of the credit-based shaper algorithm L.1 Overview of credit-based shaper operation
1759	L.2 “Class measurement intervals” in Bridges
1761	L.3 Determining worst-case latency contribution and buffering requirements
1771	L.4 Operation of the credit-based shaper in a coordinated shared network
1773	Annex M Support for PFC in link layers without MAC Control M.1 Overview M.2 PFC PDU Format
1774	Annex N Buffer requirements for Priority-based Flow Control N.1 Overview
1775	N.2 Delay model
1777	N.3 Interface Delay N.4 Cable Delay N.5 Higher Layer Delay
1778	N.6 Computation example
1779	Annex O Bibliography

Additional information

Standard Title	IEEE Standard for Local and metropolitan area networks–Media Access Control (MAC) Bridges and Virtual Bridges
Published Code	IEEE
Publication Date	2012
Pages Count	1782

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