IEEE Std 802.1w-2001 Part 3: Media Access Control (MAC) Bridges—Amendment 2: Rapid Reconfiguration -Description

Abstract: This amendment to 802.1D, 1998 Edition (15802-3: 1998) and 802.1t-2001 defines the changes necessary to the operation of a MAC Bridge in order to provide rapid Spanning Tree reconfiguration capability.

Keywords: local area networks, MAC Bridge management, MAC Bridges, media access control (MAC) bridges, Rapid Spanning Tree Algorithm and Protocol (RSTP)

Content

• Editorial notes
• • 1. Overview
  • 1.1 Introduction
  • 1.2 Scope
  • 2. References
  • 4. Abbreviations
  • 5. Conformance
  • 5.1 Static conformance requirements
  • 5.2 Options
  • 6. Support of the MAC Service
  • 6.3 Quality of service maintenance
  • • 6.3.1 Service availability
    • 6.3.2 Frame loss
    • 6.3.3 Frame misordering
    • 6.3.4 Frame duplication
  • 6.4 Internal Sublayer Service provided within the MAC Bridge
  • • 6.4.3 Point to Point MAC parameters
  • 6.5 Support of the Internal Sublayer Service by specific MAC procedures
  • • 6.5.1 Support by 802.3 (CSMA/CD)
  • 8. The Spanning Tree algorithm and protocol
  • 9. Encoding of Bridge Protocol Data Units (BPDUs)
  • 9.1 Structure
  • • 9.1.1 Transmission and representation of octets
    • 9.1.2 Components
  • 9.2 Encoding of parameter types
  • • 9.2.1 Encoding of protocol identifiers
    • 9.2.2 Encoding of protocol version identifiers
    • 9.2.3 Encoding of BPDU types
    • 9.2.4 Encoding of flags
    • 9.2.5 Encoding of Bridge Identifiers
    • 9.2.6 Encoding of Root Path Cost
    • 9.2.7 Encoding of Port Identifiers
    • 9.2.8 Encoding of Timer Values
    • 9.2.9 Encoding of Port Role values
    • 9.2.10 Encoding of Length Values
  • 9.3 BPDU formats and parameters
  • • 9.3.1 Configuration BPDUs
    • 9.3.2 Topology change notification BPDUs
    • 9.3.3 Rapid Spanning Tree BPDUs (RST BPDUs)
    • 9.3.4 Validation of received BPDUs
  • 12. Generic Attribute Registration Protocol (GARP)
  • 12.7 Overview of GARP protocol operation
  • • 12.7.10 Use of GARP in point-to-point LANs
  • 14. Bridge management
  • 14.2 Managed objects
  • 14.8 Bridge Protocol Entity
  • • 14.8.1 The Protocol Entity
    • 14.8.2 Bridge Port
  • 17. Rapid Spanning Tree Algorithm and Protocol (RSTP)
  • 17.1 Requirements
  • 17.2 Requirements of the MAC bridges
  • 17.3 Overview
  • 17.4 Computation of the active topology
  • • 17.4.1 Port Role Assignment
    • 17.4.2 Spanning tree priority vectors
  • 17.5 Port States
  • 17.6 Topology examples
  • 17.7 Communicating Spanning Tree Information
  • 17.8 Changing Spanning Tree Information
  • 17.9 Changing Port States
  • 17.10 Updating Learned Station Location Information
  • 17.11 RSTP and point-to-point links
  • 17.12 STP compatibility
  • 17.13 Rapid Spanning Tree state machines
  • 17.14 Notational conventions used in State Diagrams
  • 17.15 State machine timers
  • • 17.15.1 fdWhile
    • 17.15.2 helloWhen
    • 17.15.3 mdelayWhile
    • 17.15.4 rbWhile
    • 17.15.5 rcvdInfoWhile
    • 17.15.6 rrWhile
    • 17.15.7 tcWhile
  • 17.16 State machine performance parameters
  • • 17.16.1 ForceVersion
    • 17.16.2 FwdDelay
    • 17.16.3 HelloTime
    • 17.16.4 MigrateTime
    • 17.16.5 PortPathCost
    • 17.16.6 TxHoldCount
  • 17.17 Per-Bridge Variables
  • • 17.17.1 BEGIN
    • 17.17.2 BridgeIdentifier
    • 17.17.3 BridgePriority
    • 17.17.4 BridgeTimes
    • 17.17.5 rootPortId
    • 17.17.6 rootPriority
    • 17.17.7 rootTimes
  • 17.18 Per-Port variables
  • • 17.18.1 agreed
    • 17.18.2 designatedPriority
    • 17.18.3 designatedTimes
    • 17.18.4 forward
    • 17.18.5 forwarding
    • 17.18.6 infoIs
    • 17.18.7 initPm
    • 17.18.8 learn
    • 17.18.9 learning
    • 17.18.10 mcheck
    • 17.18.11 msgPriority
    • 17.18.12 msgTimes
    • 17.18.13 newInfo
    • 17.18.14 operEdge
    • 17.18.15 portEnabled
    • 17.18.16 portId
    • 17.18.17 portPriority
    • 17.18.18 portTimes
    • 17.18.19 proposed
    • 17.18.20 proposing
    • 17.18.21 rcvdBPDU
    • 17.18.22 rcvdMsg
    • 17.18.23 rcvdRSTP
    • 17.18.24 rcvdSTP
    • 17.18.25 rcvdTc
    • 17.18.26 rcvdTcAck
    • 17.18.27 rcvdTcn
    • 17.18.28 reRoot
    • 17.18.29 reselect
    • 17.18.30 role
    • 17.18.31 selected
    • 17.18.32 selectedRole
    • 17.18.33 sendRSTP
    • 17.18.34 sync
    • 17.18.35 synced
    • 17.18.36 tc
    • 17.18.37 tcAck
    • 17.18.38 tcProp
    • 17.18.39 tick
    • 17.18.40 txCount
    • 17.18.41 updtInfo
  • 17.19 State machine procedures
  • • 17.19.1 clearReselectBridge()
    • 17.19.2 disableForwarding()
    • 17.19.3 disableLearning()
    • 17.19.4 enableForwarding()
    • 17.19.5 enableLearning()
    • 17.19.6 flush()
    • 17.19.7 newTcWhile()
    • 17.19.8 rcvBpdu()
    • 17.19.9 recordProposed()
    • 17.19.10 setSyncBridge()
    • 17.19.11 setReRootBridge()
    • 17.19.12 setSelectedBridge()
    • 17.19.13 setTcFlags()
    • 17.19.14 setTcPropBridge()
    • 17.19.15 txConfig()
    • 17.19.16 txRstp()
    • 17.19.17 txTcn()
    • 17.19.18 updtBPDUVersion()
    • 17.19.19 updtRcvdInfoWhile()
    • 17.19.20 updtRoleDisabledBridge()
    • 17.19.21 updtRolesBridge()
  • 17.20 The Port Timers state machine
  • 17.21 The Port Information state machine
  • 17.22 The Port Role Selection state machine
  • 17.23 The Port Role Transitions state machine
  • • 17.23.1 Disabled, alternate, and backup port role transitions
    • 17.23.2 Root Port role transitions
    • 17.23.3 Designated Port role transitions
  • 17.24 Port State Transition state machine
  • 17.25 Topology Change state machine
  • 17.26 Port Protocol Migration state machine
  • 17.27 Port Transmit state machine
  • 17.28 Performance
  • • 17.28.1 Requirements
    • 17.28.2 Parameter values
• Annex A PICS Proforma
• • A.4 PICS proforma for ISO/IEC 15802-3 802.1D
  • • A.4.1 Implementation identification
    • A.4.2 Protocol summary, 15802-3 802.1D
  • A.5 Major capabilities and options
  • A.6 Relay and filtering of frames
  • A.7 Maintenance of filtering entries in the filtering database
  • A.8 Addressing
  • A.9 Spanning Tree algorithm
  • A.10 Rapid Spanning Tree algorithm
  • A.11 Bridge management
  • A.12 Performance
  • A.13 GARP and GMRP
• Annex B Calculating Spanning Tree parameters
• • B.1 Overview
  • B.2 Abbreviations and special symbols
  • B.3 Calculation
  • • B.3.1 Lifetime, diameter, and transit delay
• auto Recommended values for IEEE 802 Bridged LANs
• • B.3.2 Transmission of BPDUs
  • • B.3.3 Accuracy of message age
    • B.3.4 Hello time
    • B.3.5 Bridge protocol message propagation time
    • B.3.6 Hold time
    • B.3.7 Max age
    • B.3.8 Forward delay
  • B.4 Selection of parameter ranges
  • • B.4.1 Absolute maximum values
    • B.4.2 Hold time
    • B.4.3 Range of hello time
    • B.4.4 Maximum required values of max age and forward delay
    • B.4.5 Minimum values for max age and forward delay
    • B.4.6 Relationship between max age and forward delay
• Annex F Target topology, migration, and interoperability
• • F.2 RSTP considerations
  • • F.2.1 Overview of protocol changes
    • F.2.2 BPDU formats
    • F.2.3 RSTP performance
    • F.2.4 Misordering and Duplication in RSTP Bridges
• Annex G Bibliography

links: [Standard Status] - [Purchase] - [PDF^*] - [LAN/MAN (802) Collection - Description]

available for Standards Online LAN/MAN (802) Collection subscribers only