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rfc:rfc1708

Network Working Group: D. Gowin Request for Comments: 1708 Vitro Corp. Category: Informational October 1994

                         NTP PICS PROFORMA
              For the Network Time Protocol Version 3

Status of this Memo

 This memo provides information for the Internet community.  This memo
 does not specify an Internet standard of any kind.  Distribution of
 this memo is unlimited.

Abstract

 This RFC describes a PICS Proforma translated into an Internet
 acceptable form.  The Original document was developed according to
 ISO 9646 for conformance test purposes.  This document is intended
 for both developers and users of the NTP (Network Time Protocol).
 This document contains specific information and performance
 characteristics for the use of NTP within the context of Internet
 usage.  It is suggested, that users wishing to use the
 synchronization capabilities of the Internet abide by the
 characteristics set within this document.
 For more information please contact Dr. David Mills at Mills@udel.edu
 or review RFC 1305 for more information.

1. INTRODUCTION

 To evaluate conformance of a particular implementation, it is
 necessary to have a statement of the capabilities and options that
 have been implemented for a given protocol.  Such a statement is
 called a Protocol Implementation Conformance Statement (PICS).

2. SCOPE

 This document provides the PICS proforma for the Network Time
 Protocol (NTP) in compliance with the relevant requirements, and in
 accordance with the relevant guidance, given in ISO/IEC 9646-2.

3. REFERENCE DOCUMENTS

   ISO/IEC 9646-1 1990, Information technology - Open systems
                  interconnection - Conformance testing
                  methodology and framework - Part 1: General
                  concepts.

Gowin [Page 1] RFC 1708 NTP PICS Proforma October 1994

   ISO/IEC 9646-2 1990, Information technology - Open systems
                  interconnection - Conformance testing
                  methodology and framework - Part 2: Abstract
                  test suite specification.
   RFC 1305       Network Time Protocol (Version 3) -
                  Specification, Implementation and Analysis -
                  David L. Mills, University of Delaware -
                  March 1992.

4. DEFINITIONS

 This document uses the following terms defined in ISO/IEC 9646-1:
   a) PICS proforma;
   b) Protocol Implementation Conformance Statement (PICS);
   c) Static conformance review.

4.1 SPECIAL SYMBOLS

 The additional symbols have been identified for use in this document:
        m    Mandatory field/function
        o.#  Optional field/function
        c#   Conditional field/function
        #    Refers to a note # below the table
        x    Prohibited use
        n/a  Not applicable
        Y[]  Indicates the item is implemented
        N[]  Indicates the item is not implemented

5. INSTRUCTIONS FOR COMPLETION OF PICS

 The supplier of a protocol implementation which is claimed to conform
 to NTP version 3 is required to complete a copy of the PICS proforma
 provided in this document and is required to provide the information
 necessary to identify both the supplier and the implementation.

Gowin [Page 2] RFC 1708 NTP PICS Proforma October 1994

6. COPYRIGHT

 Copyright release for PICS proforma.  Users of this RFC may freely
 reproduce the PICS proforma in this document so that it can be used
 for its intended purpose and may further publish the completed PICS.

7. IMPLEMENTATION IDENTIFICATION

 +=======================================+=======================+
 |           SUPPLIER                    |                       |
 |                                       |                       |
 +---------------------------------------+-----------------------+
 |                                       |                       |
 |      CONTACT POINT FOR                |                       |
 |    QUERIES ABOUT THE PICS             |                       |
 |                                       |                       |
 +---------------------------------------+-----------------------+
 |                                       |                       |
 |     IMPLEMENTATION NAME               |                       |
 |          AND VERSION                  |                       |
 |                                       |                       |
 +---------------------------------------+-----------------------+
 |                                       |                       |
 |      OTHER INFORMATION                |                       |
 |      NECESSARY FOR FULL               |                       |
 |     IDENTIFICATION - e.g.             |                       |
 |       NAME AND VERSION                |                       |
 |      FOR MACHINES AND/OR              |                       |
 |      OPERATING SYSTEMS;               |                       |
 |          SYSTEM NAME                  |                       |
 |                                       |                       |
 |                                       |                       |
 |                                       |                       |
 +=======================================+=======================+

8. NETWORK TIME PROTOCOL PICS PROFORMA

8.1 DATA FORMATS

 Item No.    NTP Requirements     Reference     Status    Support
 =================================================================
 8.1.01      64 bit time
             stamp                  3.1           m       Y[] N[]

Gowin [Page 3] RFC 1708 NTP PICS Proforma October 1994

8.2 STATE VARIABLES AND PARAMETERS

8.2.1 COMMON VARIABLES

 Item No.    NTP Requirements     Reference     Status    Support
 =================================================================
 8.2.1.01    Peer Address           3.2.1         m       Y[] N[]
 8.2.1.02    Peer Port              3.2.1         m       Y[] N[]
 8.2.1.03    Host Address           3.2.1         m       Y[] N[]
 8.2.1.04    Host Port              3.2.1         m       Y[] N[]
 8.2.1.05    Leap Indicator         3.2.1         m       Y[] N[]
 8.2.1.06    Mode                   3.2.1         m       Y[] N[]
 8.2.1.07    Stratum                3.2.1         m       Y[] N[]
 8.2.1.08    Poll                   3.2.1         m       Y[] N[]
 8.2.1.09    Precision              3.2.1         m       Y[] N[]
 8.2.1.10    Root Delay             3.2.1         m       Y[] N[]
 8.2.1.11    Root Dispersion        3.2.1         m       Y[] N[]
 8.2.1.12    Reference Clock
             Identifier             3.2.1         m       Y[] N[]
 8.2.1.13    Reference
             Timestamp              3.2.1         m       Y[] N[]
 8.2.1.14    Originate
             Timestamp              3.2.1         m       Y[] N[]
 8.2.1.15    Receive
             Timestamp              3.2.1         m       Y[] N[]
 8.2.1.16    Transmit
             Timestamp              3.2.1         m       Y[] N[]

8.2.2 SYSTEM VARIABLES

 Item No.    NTP Requirements     Reference     Status    Support
 =================================================================
 8.2.2.01    Local Clock            3.2.2         m       Y[] N[]
 8.2.2.02    Clock Source           3.2.2         m       Y[] N[]

8.2.3 PEER VARIABLES

 Item No.    NTP Requirements     Reference     Status    Support
 =================================================================
 8.2.3.01    Configured Bit         3.2.3         m       Y[] N[]
 8.2.3.02    Update Timestamp       3.2.3         m       Y[] N[]
 8.2.3.03    Reachability
             Register               3.2.3         m       Y[] N[]
 8.2.3.04    Peer Timer             3.2.3         m       Y[] N[]

Gowin [Page 4] RFC 1708 NTP PICS Proforma October 1994

8.2.4 PACKET VARIABLES

 Item No.    NTP Requirements     Reference     Status    Support
 =================================================================
 8.2.4.01    Version Number         3.2.4         m       Y[] N[]

8.2.5 CLOCK FILTER VARIABLES

 Item No.    NTP Requirements     Reference     Status    Support
 =================================================================
 8.2.5.01    Filter Register        3.2.5         m       Y[] N[]
 8.2.5.02    Valid Data
             Counter                3.2.5         m       Y[] N[]
 8.2.5.03    Offset                 3.2.5         m       Y[] N[]
 8.2.5.04    Delay                  3.2.5         m       Y[] N[]
 8.2.5.05    Dispersion             3.2.5         m       Y[] N[]

8.2.6 AUTHENTICATION VARIABLES

 Item No.    NTP Requirements     Reference     Status    Support
 =================================================================
 8.2.6.01    Authentication
             Enable Bit             3.2.6         c1      Y[] N[]
 8.2.6.02    Authenticated
             Bit                    3.2.6         c1      Y[] N[]
 8.2.6.03    Key Identifier         3.2.6         c1      Y[] N[]
 8.2.6.04    Cryptographic
             Keys                   3.2.6         c1      Y[] N[]
 8.2.6.05    Crypto Checksum        3.2.6         c1      Y[] N[]
   c1:   IF authentication is used THEN m ELSE o.

8.2.7 PARAMETER VALUES

 Item No.    NTP Requirements     Reference     Status    Support
 =================================================================
 8.2.7.01    Version Number = 3     3.2.7         c1      Y[] N[]
 8.2.7.02    NTP Port = 123         3.2.7         c1      Y[] N[]
 8.2.7.03    Max Stratum = 15       3.2.7         c1      Y[] N[]
 8.2.7.04    Max Clock Age =
             86,400 sec.            3.2.7         c1      Y[] N[]
 8.2.7.05    Max Skew = 1 sec.      3.2.7         c1      Y[] N[]
 8.2.7.06    Max Distance = 1 sec.  3.2.7         c1      Y[] N[]
 8.2.7.07    Min Polling Interval =
             6(64 sec.)             3.2.7         c1      Y[] N[]
 8.2.7.08    Max Polling Interval =
             10(1024 sec.)          3.2.7         c1      Y[] N[]
 8.2.7.09    Min Select Clock = 1   3.2.7         c1      Y[] N[]

Gowin [Page 5] RFC 1708 NTP PICS Proforma October 1994

 8.2.7.10    Max Select Clock = 10  3.2.7         c1      Y[] N[]
 8.2.7.11    Min Dispersion =
             0.01 sec.              3.2.7         c1      Y[] N[]
 8.2.7.12    Max Dispersion =
             16 sec.                3.2.7         c1      Y[] N[]
 8.2.7.13    Reachability Reg
             Size = 8               3.2.7         c1      Y[] N[]
 8.2.7.14    Filter Size = 8        3.2.7         c1      Y[] N[]
 8.2.7.15    Filter Weight = 1/2    3.2.7         c1      Y[] N[]
 8.2.7.16    Select Weight = 3/4    3.2.7         c1      Y[] N[]
   c1:   IF implementation is intended for use on the Internet
         THEN m ELSE o.

8.2.8 MODES OF OPERATION

 Item No.    NTP Requirements     Reference     Status    Support
 =================================================================
 8.2.8.01    Symmetric Active       3.3           o.1     Y[] N[]
 8.2.8.02    Symmetric Passive      3.3           o.1     Y[] N[]
 8.2.8.03    Client                 3.3           o.1     Y[] N[]
 8.2.8.04    Server                 3.3           o.1     Y[] N[]
 8.2.8.05    Broadcast              3.3           o.1     Y[] N[]
   o.1:At least one mode must be implemented.

8.2.9 EVENT PROCESSING

8.2.9.1 TRANSMIT PROCEDURE

 Item No.    NTP Requirements     Reference     Status    Support
 =================================================================
 8.2.9.1.01  Transmit Procedure     3.4.2         m       Y[] N[]
 8.2.9.1.02  Authentication         3.4.2         o       Y[] N[]

8.2.9.2 RECEIVE PROCEDURE

 Item No.    NTP Requirements     Reference     Status    Support
 =================================================================
 8.2.9.2.01  Receive Procedure      3.4.3         m       Y[] N[]
 8.2.9.2.02  Control Messages       3.4.3         o.1     Y[] N[]
 8.2.9.2.03  Authentication         3.4.3         o       Y[] N[]
   o.1:If implemented then section 8.6 must be completed.

Gowin [Page 6] RFC 1708 NTP PICS Proforma October 1994

8.2.9.3 PACKET PROCEDURE

 Item No.    NTP Requirements     Reference     Status    Support
 =================================================================
 8.2.9.3.01  Packet Procedure       3.4.4         m       Y[] N[]
 8.2.9.3.02  Authentication         3.4.4         o       Y[] N[]

8.2.9.4 CLOCK UPDATE PROCEDURE

 Item No.    NTP Requirements     Reference     Status    Support
 =================================================================
 8.2.9.4.01  Clock Update           3.4.5         m       Y[] N[]

8.2.9.5 PRIMARY CLOCK PROCEDURE

 Item No.    NTP Requirements     Reference     Status    Support
 =================================================================
 8.2.9.5.01  Primary Clock          3.4.6         m       Y[] N[]

8.2.9.6 INITIALIZATION PROCEDURES

 Item No.    NTP Requirements     Reference     Status    Support
 =================================================================
 8.2.9.6.01  Initialization         3.4.7.1       m       Y[] N[]
 8.2.9.6.02  Authentication         3.4.7.1       o       Y[] N[]

8.2.9.7 INITIALIZATION INSTANTIATION PROCEDURE

 Item No.    NTP Requirements     Reference     Status    Support
 =================================================================
 8.2.9.7.01  Initialization
             Instantiation          3.4.7.2       m       Y[] N[]
 8.2.9.7.02  Authentication         3.4.7.2       o       Y[] N[]

8.2.9.8 RECEIVE INSTANTIATION PROCEDURE

 Item No.    NTP Requirements     Reference     Status    Support
 =================================================================
 8.2.9.8.01  Receive Instantiation  3.4.7.3       m       Y[] N[]
 8.2.9.8.02  Authentication         3.4.7.3       o       Y[] N[]

8.2.9.9 PRIMARY CLOCK INSTANTIATION PROCEDURE

 Item No.    NTP Requirements     Reference     Status    Support
 =================================================================
 8.2.9.9.01  Clock Instantiation    3.4.7.4       m       Y[] N[]

Gowin [Page 7] RFC 1708 NTP PICS Proforma October 1994

8.2.9.10 CLEAR PROCEDURE

 Item No.    NTP Requirements     Reference     Status    Support
 =================================================================
 8.2.9.10.01 Clear Proc.            3.4.8         m       Y[] N[]

8.2.9.11 POLL UPDATE PROCEDURE

 Item No.    NTP Requirements     Reference     Status    Support
 =================================================================
 8.2.9.11.01 Poll Update            3.4.9         m       Y[] N[]

8.2.9.12 SYNCHRONIZATION DISTANCE PROCEDURE

 Item No.    NTP Requirements     Reference     Status    Support
 =================================================================
 8.2.9.12.01 Distance Proc.         3.5           m       Y[] N[]

8.3 FILTERING AND SELECTION ALGORITHMS

8.3.1 CLOCK FILTER PROCEDURE

 Item No.    NTP Requirements     Reference     Status    Support
 =================================================================
 8.3.1.01    Clock Filter           4.1           o       Y[] N[]

8.3.2 CLOCK SELECTION PROCEDURE

 Item No.    NTP Requirements     Reference     Status    Support
 =================================================================
 8.3.2.01    Clock Selection
             Procedure              4.2           o       Y[] N[]
 8.3.2.02    Intersection Algorithm 4.2.1         c1      Y[] N[]
 8.3.2.03    Clustering Algorithm   4.2.2         c1      Y[] N[]
   c1: IF Clock Selection Procedure implemented THEN m ELSE o.

8.4 LOCAL CLOCKS

 Item No.    NTP Requirements     Reference     Status    Support
 =================================================================
 8.4.01      Logical Clock          5             m       Y[] N[]

Gowin [Page 8] RFC 1708 NTP PICS Proforma October 1994

8.4.1 FUZZBALL LOCAL CLOCK IMPLEMENTATIONS

8.4.1.1 CRYSTAL OSCILLATOR BASED IMPLEMENTATION PARAMETER VALUES

 Item No.    NTP Requirements     Reference     Status    Support
 =================================================================
 8.4.1.1.01  Adjustment Interval =
             4 sec.                 5.1           c1      Y[] N[]
 8.4.1.1.02  PPS Timeout = 60 sec.  5.1           c1      Y[] N[]
 8.4.1.1.02  Step Timeout =
             900 sec.               5.1           c1      Y[] N[]
 8.4.1.1.02  Maximum Aperture =
             q128 ms                5.1           c1      Y[] N[]
 8.4.1.1.03  Frequency Weight = 16  5.1           c1      Y[] N[]
 8.4.1.1.04  Phase Weight = 8       5.1           c1      Y[] N[]
 8.4.1.1.05  Compliance Weight = 13 5.1           c1      Y[] N[]
 8.4.1.1.06  Compliance Maximum = 4 5.1           c1      Y[] N[]
 8.4.1.1.07  Compliance
             Multiplier = 4         5.1           c1      Y[] N[]
   c1:IF implementing a fuzzball using a crystal oscillator
           based local clock THEN m ELSE o.

8.4.1.2 MAIN SYSTEM CLOCK IMPLEMENTATION PARAMETER VALUES

 Item No.    NTP Requirements     Reference     Status    Support
 =================================================================
 8.4.1.2.01  Adjustment
             Interval = 1 sec.      5.1           c1      Y[] N[]
 8.4.1.2.02  PPS Timeout = 60 sec.  5.1           c1      Y[] N[]
 8.4.1.2.02  Step Timeout =
             900 sec.               5.1           c1      Y[] N[]
 8.4.1.2.02  Maximum Aperture =
             q512 ms                5.1           c1      Y[] N[]
 8.4.1.2.03  Frequency Weight = 16  5.1           c1      Y[] N[]
 8.4.1.2.04  Phase Weight = 9       5.1           c1      Y[] N[]
 8.4.1.2.05  Compliance Weight = 13 5.1           c1      Y[] N[]
 8.4.1.2.06  Compliance Maximum = 4 5.1           c1      Y[] N[]
 8.4.1.2.07  Compliance
             Multiplier = 4         5.1           c1      Y[] N[]
   c1:IF implementing a fuzzball using a main system clock
           THEN m ELSE o.

Gowin [Page 9] RFC 1708 NTP PICS Proforma October 1994

8.4.2 PHASE ADJUSTMENT

 Item No.   NTP Requirements      Reference     Status    Support
 =================================================================
 8.4.2.01   Gradual Phase
            Adjustment              5.2           m      Y[] N[]
 8.4.2.02   Step Phase Adjustment   5.3           m      Y[] N[]

8.5 NTP DATA FORMAT

 Item No.   NTP Requirements      Reference     Status    Support
 =================================================================
 8.5.01     Leap Indicator
            is a 2 bit code       App. A          m       Y[] N[]
 8.5.02     Version Number
            is a 3 bit integer    App. A          m       Y[] N[]
 8.5.03     Mode
            is a 3 bit integer    App. A          m       Y[] N[]
 8.5.04     Stratum is an 8
            bit integer           App. A          m       Y[] N[]
 8.5.05     Poll is an 8 bit
            signed integer        App. A          m       Y[] N[]
 8.5.06     Precision is an
            8 bit signed integer  App. A          m       Y[] N[]
 8.5.07     Root Delay is a 32 bit signed
            fixed-point number    App. A          m       Y[] N[]
 8.5.08     Root Dispersion is a 32 bit
            fixed-point number    App. A          m       Y[] N[]
 8.5.09     Reference Identifier is a 4
            octet, left justified, zero
            padded ASCII string   App. A          m       Y[] N[]
 8.5.10     Reference Timestamp is a 64
            bit timestamp format  App. A          m       Y[] N[]
 8.5.11     Originate Timestamp is a 64
            bit timestamp format  App. A          m       Y[] N[]
 8.5.12     Receive Timestamp is a 64
            bit timestamp format  App. A          m       Y[] N[]
 8.5.13     Transmit Timestamp is a 64
            bit timestamp  format App. A          m       Y[] N[]
 8.5.14     Authenticator 96 bits App. A          o       Y[] N[]

Gowin [Page 10] RFC 1708 NTP PICS Proforma October 1994

8.6 NTP Control Messages

8.6.1 NTP Control Message Header Format

 Item No.   NTP Requirements      Reference     Status    Support
 =================================================================
 8.6.1.01   Leap Indicator
            is a 2 bit code       App. B.1        c1      Y[] N[]
 8.6.1.02   Version Number
            is a 3 bit integer    App. B.1        c1      Y[] N[]
 8.6.1.03   Mode is a 3 bit
            integer               App. B.1        c1      Y[] N[]
 8.6.1.04   Response bit is
            a 1 Bit field         App. B.1        c1      Y[] N[]
 8.6.1.05   Error bit is a 1
            bit field             App. B.1        c1      Y[] N[]
 8.6.1.06   More bit is a 1
            bit field             App. B.1        c1      Y[] N[]
 Item No.   NTP Requirements      Reference     Status    Support
 =================================================================
 8.6.1.07   Operation Code
            is a 5 bit integer    App. B.1        c1      Y[] N[]
 8.6.1.08   Sequence is a 16
            bit integer           App. B.1        c1      Y[] N[]
 8.6.1.09   Status is a 16
            bit code              App. B.1        c1      Y[] N[]
 8.6.1.10   Association ID
            is a 16 bit integer   App. B.1        c1      Y[] N[]
 8.6.1.11   Offset is a 16
            bit integer           App. B.1        c1      Y[] N[]
 8.6.1.12   Count is a 16
            bit integer           App. B.1        c1      Y[] N[]
 8.6.1.13   Data is a
            maximum of 468 octets App. B.1        c1      Y[] N[]
 8.6.1.14   Authenticator
            96 bits               App. B.1        c1      Y[] N[]
   c1: IF control messages are used THEN m ELSE o.

Gowin [Page 11] RFC 1708 NTP PICS Proforma October 1994

8.6.1.1 NTP Control Message Required Values

 Item No.   NTP Requirements      Reference     Status    Support
 =================================================================
 8.6.1.1.01 Leap Indicator = 00   App. B.1        c1      Y[] N[]
 8.6.1.1.02 Version Number = 3    App. B.1        c1      Y[] N[]
 8.6.1.1.03 Mode = 6              App. B.1        c1      Y[] N[]
   c1:IF control messages are used THEN m ELSE o.

8.6.2 System Words

8.6.2.1 System Status Word

 Item No.   NTP Requirements      Reference     Status    Support
 =================================================================
 8.6.2.1.01 Leap Indicator
            is a 2 bit code       App.B.2.1       c1      Y[] N[]
 8.6.2.1.02 Clock Source is
            a 6 bit integer       App.B.2.1       c1      Y[] N[]
 8.6.2.1.03 System Event Counter
            is a 4 bit integer    App.B.2.1       c1      Y[] N[]
 8.6.2.1.04 System Event Code
            is a 4 bit integer    App.B.2.1       c1      Y[] N[]
   c1:IF control messages are used THEN m ELSE o.

8.6.2.2 Peer Status Word

 Item No.   NTP Requirements      Reference     Status    Support
 =================================================================
 8.6.2.2.01 Peer Status is a
            5 bit code            App.B.2.2       c1      Y[] N[]
 8.6.2.2.02 Peer Selection
            is a 3 bitinteger     App.B.2.2       c1      Y[] N[]
 8.6.2.2.03 Peer Event Counter
            is a 4 bit integer    App.B.2.2       c1      Y[] N[]
 8.6.2.2.04 Peer Event Code
            is a 4 bit integer    App.B.2.2       c1      Y[] N[]
   c1:IF control messages are used THEN m ELSE o.

Gowin [Page 12] RFC 1708 NTP PICS Proforma October 1994

8.6.2.3 Clock Status Word

 Item No.   NTP Requirements      Reference     Status    Support
 =================================================================
 8.6.2.3.01 Clock Status is
            an 8 bit integer      App.B.2.3       c1      Y[] N[]
 8.6.2.3.02 Clock Event Code
            is an 8 bit integer   App.B.2.3       c1      Y[] N[]
   c1:IF control messages are used THEN m ELSE o.

8.6.2.4 Error Status Word

 Item No.   NTP Requirements      Reference     Status    Support
 =================================================================
 8.6.2.4.01 Error Status is
            an 8 bit integer      App.B.2.4       c1      Y[] N[]
   c1:IF control messages are used THEN m ELSE o.

9. Security Considerations

 Security issues are not discussed in this memo

10. References

 [1] Mills. D., "Network Time Protocol Version 3 - Specification,
     Implementation and Analysis", RFC 1305, UDEL, March 1992.

11. Author's Address

 Dan R. Gowin
 Vitro a Tracor Company
 5001 N. St. Rd. 37 (BUS)
 Bloomington, IN 47404-1626
 Phone: (812) 336-2299 x379
 Fax: (812) 333-0415
 EMail: drg508@crane-ns.nwscc.sea06.navy.MIL

Gowin [Page 13]

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