Final text of DIS 8473, Protocol for Providing the Connectionless-mode Network Service
RFC 994

Document Type RFC - Unknown (March 1986; Errata)
Obsoletes RFC 926
Last updated 2014-12-25
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Network Working Group                                   ANSI X3S3.3 86-80
Request for Comments: 994                             ISO TC97/SC6/N 3998
                                                               March 1986

                                 I S O
             INTERNATIONAL ORGANIZATION FOR STANDARDIZATION
              ORGANISATION INTERNATIONALE DE NORMALISATION

     ______________________________________________________________________
    |                                                                     |
    |                            ISO/TC 97/SC 6                           |
    |                TELECOMMUNICATIONS AND INFORMATION                   |
    |                     EXCHANGE BETWEEN SYSTEMS                        |
    |                       Secretariat: USA (ANSI)                       |
    |                                                                     |
    |                                                                     |
    |_____________________________________________________________________|

Title:  Final Text of DIS 8473, Protocol for Providing the Connectionless-
        mode Network Service

Source:  DIS 8473 Editor

ISO 8473                                                        [Page 1]
RFC 994                                                    December 1986

Contents

1   Scope and Field of Application                                         6

2   References                                                             7

SECTION ONE. GENERAL                                                       9

3   Definitions                                                            9
    3.1   Reference Model Definitions  . . . . . . . . . . . . . . . . .   9
    3.2   Service Conventions Definitions  . . . . . . . . . . . . . . .   9
    3.3   Network Layer Architecture Definitions . . . . . . . . . . . .   9
    3.4   Network Layer Addressing Definitions . . . . . . . . . . . . .  10
    3.5   Additional Definitions . . . . . . . . . . . . . . . . . . . .  10

4   Symbols and Abbreviations                                             11
    4.1   Data Units   . . . . . . . . . . . . . . . . . . . . . . . . .  11
    4.2   Protocol Data Units  . . . . . . . . . . . . . . . . . . . . .  11
    4.3   Protocol Data Unit Fields  . . . . . . . . . . . . . . . . . .  11
    4.4   Parameters . . . . . . . . . . . . . . . . . . . . . . . . . .  11
    4.5   Miscellaneous  . . . . . . . . . . . . . . . . . . . . . . . .  11

5   Overview of the Protocol                                              12
    5.1   Internal Organization of the Network Layer . . . . . . . . . .  12
    5.2   Subsets of the Protocol  . . . . . . . . . . . . . . . . . . .  12
    5.3   Addresses and Titles . . . . . . . . . . . . . . . . . . . . .  13
          5.3.1   Addresses  . . . . . . . . . . . . . . . . . . . . . .  13
          5.3.2   Network-entity Titles  . . . . . . . . . . . . . . . .  13
    5.4   Service Provided by the Network Layer  . . . . . . . . . . . .  14
    5.5   Underlying Service Assumed by the Protocol . . . . . . . . . .  14
          5.5.1   Subnetwork Points of Attachment  . . . . . . . . . . .  15
          5.5.2   Subnetwork Quality of Service  . . . . . . . . . . . .  15
          5.5.3   Subnetwork User Data   . . . . . . . . . . . . . . . .  16
          5.5.4   Subnetwork Dependent Convergence Functions . . . . . .  16
    5.6   Service Assumed from Local Environment . . . . . . . . . . . .  16

SECTION  TWO.  SPECIFICATION  OF  THE  PROTOCOL                           18

6   Protocol Functions                                                    18
    6.1   PDU Composition Function . . . . . . . . . . . . . . . . . . .  18
    6.2   PDU Decomposition Function . . . . . . . . . . . . . . . . . .  19
    6.3   Header Format Analysis Function  . . . . . . . . . . . . . . .  19

ISO 8473                                                        [Page 2]
RFC 994                                                    December 1986

    6.4   PDU Lifetime Control Function  . . . . . . . . . . . . . . . .  20
    6.5   Route PDU Function . . . . . . . . . . . . . . . . . . . . . .  20
    6.6   Forward PDU Function . . . . . . . . . . . . . . . . . . . . .  21
    6.7   Segmentation Function  . . . . . . . . . . . . . . . . . . . .  21
    6.8   Reassembly Function  . . . . . . . . . . . . . . . . . . . . .  22
    6.9   Discard PDU Function . . . . . . . . . . . . . . . . . . . . .  23
    6.10  Error Reporting Function . . . . . . . . . . . . . . . . . . .  24
          6.10.1  Overview . . . . . . . . . . . . . . . . . . . . . . .  24
          6.10.2  Requirements . . . . . . . . . . . . . . . . . . . . .  25
          6.10.3  Processing of Error Reports  . . . . . . . . . . . . .  25
          6.10.4  Relationship of Data PDU Options to Error Reports  . .  26
    6.11  PDU Header Error Detection . . . . . . . . . . . . . . . . . .  27
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