RFC 3931:Layer Two Tunneling Protocol - Version 3 ...
RFC-Ref

Layer Two Tunneling Protocol - Version 3 (L2TPv3)


1. Introduction
1.1. Changes from RFC 2661
1.2. Specification of Requirements
1.3. Terminology
2. Topology
3. Protocol Overview
3.1. Control Message Types
3.2. L2TP Header Formats
3.2.1. L2TP Control Message Header
3.2.2. L2TP Data Message
3.3. Control Connection Management
3.3.1. Control Connection Establishment
3.3.2. Control Connection Teardown
3.4. Session Management
3.4.1. Session Establishment for an Incoming Call
3.4.2. Session Establishment for an Outgoing Call
3.4.3. Session Teardown
4. Protocol Operation
4.1. L2TP Over Specific Packet-Switched Networks (PSNs)
4.1.1. L2TPv3 over IP
4.1.1.1. L2TPv3 Session Header Over IP
4.1.1.2. L2TP Control and Data Traffic over IP
4.1.2. L2TP over UDP
4.1.2.1. L2TP Session Header Over UDP
4.1.2.2. UDP Port Selection
4.1.2.3. UDP Checksum
4.1.3. L2TP and IPsec
4.1.4. IP Fragmentation Issues
4.2. Reliable Delivery of Control Messages
4.3. Control Message Authentication
4.4. Keepalive (Hello)
4.5. Forwarding Session Data Frames
4.6. Default L2-Specific Sublayer
4.6.1. Sequencing Data Packets
4.7. L2TPv2/v3 Interoperability and Migration
4.7.1. L2TPv3 over IP
4.7.2. L2TPv3 over UDP
4.7.3. Automatic L2TPv2 Fallback
5. Control Message Attribute Value Pairs
5.1. AVP Format
5.2. Mandatory AVPs and Setting the M Bit
5.3. Hiding of AVP Attribute Values
5.4. AVP Summary
5.4.1. General Control Message AVPs
5.4.2. Result and Error Codes
5.4.3. Control Connection Management AVPs
5.4.4. Session Management AVPs
5.4.5. Circuit Status AVPs
6. Control Connection Protocol Specification
6.1. Start-Control-Connection-Request (SCCRQ)
6.2. Start-Control-Connection-Reply (SCCRP)
6.3. Start-Control-Connection-Connected (SCCCN)
6.4. Stop-Control-Connection-Notification (StopCCN)
6.5. Hello (HELLO)
6.6. Incoming-Call-Request (ICRQ)
6.7. Incoming-Call-Reply (ICRP)
6.8. Incoming-Call-Connected (ICCN)
6.9. Outgoing-Call-Request (OCRQ)
6.10. Outgoing-Call-Reply (OCRP)
6.11. Outgoing-Call-Connected (OCCN)
6.12. Call-Disconnect-Notify (CDN)
6.13. WAN-Error-Notify (WEN)
6.14. Set-Link-Info (SLI)
6.15. Explicit-Acknowledgement (ACK)
7. Control Connection State Machines
7.1. Malformed AVPs and Control Messages
7.2. Control Connection States
7.3. Incoming Calls
7.3.1. ICRQ Sender States
7.3.2. ICRQ Recipient States
7.4. Outgoing Calls
7.4.1. OCRQ Sender States
7.4.2. OCRQ Recipient (LAC) States
7.5. Termination of a Control Connection
8. Security Considerations
8.1. Control Connection Endpoint and Message Security
8.2. Data Packet Spoofing
9. Internationalization Considerations
10. IANA Considerations
10.1. Control Message Attribute Value Pairs (AVPs)
10.2. Message Type AVP Values
10.3. Result Code AVP Values
10.4. AVP Header Bits
10.5. L2TP Control Message Header Bits
10.6. Pseudowire Types
10.7. Circuit Status Bits
10.8. Default L2-Specific Sublayer bits
10.9. L2-Specific Sublayer Type
10.10. Data Sequencing Level
11. References
11.1. Normative References
11.2. Informative References
12. Acknowledgments
13. Appendix A: Control Slow Start and Congestion Avoidance
14. Appendix B: Control Message Examples
14.1. B.1 : Lock-Step Control Connection Establishment
14.2. B.2 : Lost Packet with Retransmission
15. Appendix C: Processing Sequence Numbers
16. Editors' Addresses
17. Full Copyright Statement
18. Intellectual Property
19. Acknowledgement

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