VMTP: Versatile Message Transaction Protocol: Protocol specification
RFC 1045
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(February 1988; No errata)
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Network Working Group David Cheriton
Request for Comments: 1045 Stanford University
February 1988
VMTP: VERSATILE MESSAGE TRANSACTION PROTOCOL
Protocol Specification
STATUS OF THIS MEMO
This RFC describes a protocol proposed as a standard for the Internet
community. Comments are encouraged. Distribution of this document is
unlimited.
OVERVIEW
This memo specifies the Versatile Message Transaction Protocol (VMTP)
[Version 0.7 of 19-Feb-88], a transport protocol specifically designed
to support the transaction model of communication, as exemplified by
remote procedure call (RPC). The full function of VMTP, including
support for security, real-time, asynchronous message exchanges,
streaming, multicast and idempotency, provides a rich selection to the
VMTP user level. Subsettability allows the VMTP module for particular
clients and servers to be specialized and simplified to the services
actually required. Examples of such simple clients and servers include
PROM network bootload programs, network boot servers, data sensors and
simple controllers, to mention but a few examples.
RFC 1045 VMTP February 1988
Table of Contents
1. Introduction 1
1.1. Motivation 2
1.1.1. Poor RPC Performance 2
1.1.2. Weak Naming 3
1.1.3. Function Poor 3
1.2. Relation to Other Protocols 4
1.3. Document Overview 5
2. Protocol Overview 6
2.1. Entities, Processes and Principals 7
2.2. Entity Domains 9
2.3. Message Transactions 10
2.4. Request and Response Messages 11
2.5. Reliability 12
2.5.1. Transaction Identifiers 13
2.5.2. Checksum 14
2.5.3. Request and Response Acknowledgment 14
2.5.4. Retransmissions 15
2.5.5. Timeouts 15
2.5.6. Rate Control 18
2.6. Security 19
2.7. Multicast 21
2.8. Real-time Communication 22
2.9. Forwarded Message Transactions 24
2.10. VMTP Management 25
2.11. Streamed Message Transactions 25
2.12. Fault-Tolerant Applications 28
2.13. Packet Groups 29
2.14. Runs of Packet Groups 31
2.15. Byte Order 32
2.16. Minimal VMTP Implementation 33
2.17. Message vs. Procedural Request Handling 33
2.18. Bibliography 34
3. VMTP Packet Formats 37
3.1. Entity Identifier Format 37
3.2. Packet Fields 38
Cheriton [page i]
RFC 1045 VMTP February 1988
3.3. Request Packet 45
3.4. Response Packet 47
4. Client Protocol Operation 49
4.1. Client State Record Fields 49
4.2. Client Protocol States 51
4.3. State Transition Diagrams 51
4.4. User Interface 52
4.5. Event Processing 53
4.6. Client User-invoked Events 54
4.6.1. Send 54
4.6.2. GetResponse 56
4.7. Packet Arrival 56
4.7.1. Response 58
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