Licklider Transmission Protocol - Specification
RFC 5326
| Document | Type |
RFC - Experimental
(September 2008; Errata)
Was draft-irtf-dtnrg-ltp (dtnrg RG)
|
|
|---|---|---|---|
| Last updated | 2015-10-14 | ||
| Stream | IRTF | ||
| Formats | plain text pdf html bibtex | ||
| Stream | IRTF state | (None) | |
| Consensus Boilerplate | Unknown | ||
| RFC Editor Note | (None) | ||
| IESG | IESG state | RFC 5326 (Experimental) | |
| Telechat date | |||
| Responsible AD | Russ Housley | ||
| Send notices to | ipr@ietf.org., draft-irtf-dtnrg-ltp-motivation@ietf.org | ||
Networking Working Group M. Ramadas
Request for Comments: 5326 ISTRAC, ISRO
Category: Experimental S. Burleigh
NASA/Jet Propulsion Laboratory
S. Farrell
Trinity College Dublin
September 2008
Licklider Transmission Protocol - Specification
Status of This Memo
This memo defines an Experimental Protocol for the Internet
community. It does not specify an Internet standard of any kind.
Discussion and suggestions for improvement are requested.
Distribution of this memo is unlimited.
IESG Note
This RFC is not a candidate for any level of Internet Standard. It
represents the consensus of the Delay Tolerant Networking (DTN)
Research Group of the Internet Research Task Force (IRTF). It may be
considered for standardization by the IETF in the future, but the
IETF disclaims any knowledge of the fitness of this RFC for any
purpose and in particular notes that the decision to publish is not
based on IETF review for such things as security, congestion control,
or inappropriate interaction with deployed protocols. See RFC 3932
for more information.
Abstract
This document describes the Licklider Transmission Protocol (LTP),
designed to provide retransmission-based reliability over links
characterized by extremely long message round-trip times (RTTs)
and/or frequent interruptions in connectivity. Since communication
across interplanetary space is the most prominent example of this
sort of environment, LTP is principally aimed at supporting "long-
haul" reliable transmission in interplanetary space, but it has
applications in other environments as well.
This document is a product of the Delay Tolerant Networking Research
Group and has been reviewed by that group. No objections to its
publication as an RFC were raised.
Ramadas, et al. Experimental [Page 1]
RFC 5326 LTP - Specification September 2008
Table of Contents
1. Introduction ....................................................3
2. Terminology .....................................................4
3. Segment Structure ...............................................9
3.1. Segment Header ............................................10
3.1.1. Segment Type Flags .................................11
3.1.2. Segment Type Codes .................................13
3.1.3. Segment Class Masks ................................14
3.1.4. Extensions Field ...................................14
3.2. Segment Content ...........................................16
3.2.1. Data Segment (DS) ..................................16
3.2.2. Report Segment (RS) ................................17
3.2.3. Report Acknowledgment Segment ......................19
3.2.4. Session Management Segments ........................20
3.3. Segment Trailer ...........................................20
4. Requests from Client Service ...................................20
4.1. Transmission Request ......................................21
4.2. Cancellation Request ......................................22
5. Requirements from the Operating Environment ....................23
6. Internal Procedures ............................................24
6.1. Start Transmission ........................................25
6.2. Start Checkpoint Timer ....................................25
6.3. Start RS Timer ............................................25
6.4. Stop Transmission .........................................25
6.5. Suspend Timers ............................................26
6.6. Resume Timers .............................................26
6.7. Retransmit Checkpoint .....................................27
6.8. Retransmit RS .............................................27
6.9. Signify Red-Part Reception ................................28
6.10. Signify Green-Part Segment Arrival .......................28
6.11. Send Reception Report ....................................28
6.12. Signify Transmission Completion ..........................30
6.13. Retransmit Data ..........................................30
6.14. Stop RS Timer ............................................31
6.15. Start Cancel Timer .......................................32
6.16. Retransmit Cancellation Segment ..........................32
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