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rfc:rfc982

Network Working Group ANSI Request for Comments: 982 April 1986

      Guidelines for the Specification of the Structure of the
    Domain Specific Part (DSP) of the ISO Standard NSAP Address
                                  
                ANSI Working Document X3S3.3/85-258

Status of This Memo

 The following is a RFC edition of the ANSI "Guidelines for the
 Specification of the Structure of the Domain Specific Part (DSP) of
 the ISO Standard NSAP Address".  It should be understood that this
 ANSI working document is in a draft state and subject to change.
 These Guidelines are an important prerequirement to allow IP
 addressing within the ISO connectionless protocol (CLNS), which
 itself is necessary to allow the coexistance of the IP and the CLNS
 in the Arpanet attached gateways.
 A RFC to specify a suitable IP addressing method for ISOgrams is
 currently worked on in Internet Task Forces and should be expected as
 an RFC shortly.
 This RFC is for informational purposes only  and  it's distribution
 is unlimited. It does not specify a standard for the Arpa-Internet.
                                  Hans-Werner Braun (HWB@GW.UMICH.EDU)
                                                University of Michigan

ANSI [Page 1]

RFC 982 April 1986 ANSI Guidelines

TITLE: GUIDELINES FOR THE SPECIFICATION OF THE STRUCTURE OF THE

       DOMAIN SPECIFIC PART (DSP) OF THE ISO STANDARD NSAP ADDRESS

STATUS: X3S3.3 WORKING DRAFT

Introduction

 There is a substantial amount of interest in providing guidance to
 private address administration authorities on preferred formats and
 semantics for the Domain Specific Part (DSP) of an NSAP address.  In
 particular it is felt that use of a limited number of preferred DSP
 formats would allow organizations to easily use intermediate and end
 systems from a variety of suppliers.  This technical report specifies
 the way in which the DSP may be constructed so as to facilitate
 efficient address assignment.

1. Scope and Field of Application

 This Technical Report specifies a recommended syntax  and
 interpretation for the Domain Specific Part of an NSAP address.  NSAP
 Address Administration Authorities are urged to use this format when
 the equipment comprising an addressing domain is of a heterogeneous
 nature.

2. References

 ISO 6523           Data  Interchange  -  Structure for the
                    identification of Organizations
 ISO 7498           Information Processing Systems - Open Systems
                    Interconnection - Basic Reference Model
 ISO 8348           Information Processing Systems - Data
                    Communications - Network Service Definition
 ISO DIS 8348/DAD2  Information Processing Systems - Data
                    Communications - Addendum to the Network
                    Service  Definition Covering Network Layer
                    Addressing
 ISO DIS 8802       Information Processing Systems - Data
                    Communications - Local Area Networks
 ECMA TR/20         Layer 4 to 1 Addressing

ANSI [Page 2]

RFC 982 April 1986 ANSI Guidelines

3. Definitions

 (This section to be suppled)

4. Abbreviations

 (This section to be supplied)

5. Addressing Principles

 This section provides a summary of the major points contained in DIS
 8348/DAD2, as they are relevant to this technical report.
 Network addresses are defined to be hierarchical.  An authority may
 either assign a complete address, or else may identify a subdomain of
 its own addressing domain within which addresses may be further
 assigned by an identified authority for the subdomain.  This is done
 in such a way that all addresses are unique.
 When an authority identifies a subdomain, this creates in effect a
 prefix which applies to all addresses assigned within the subdomain.
 Certain methods of assigning authority are recognized within the body
 of DIS 8348/DAD 2.  These take account of existing addressing
 standards such as X.121.  The abstract structure of an address is
 shown in Figure 1.

ANSI [Page 3]

RFC 982 April 1986 ANSI Guidelines

    +---------------------------+---------------------------+
    I                           I                           I
    I        I D P              I          D S P            I
    I                           I                           I
    +---------------------------+---------------------------+
    :                           :
    :                           :
    V                           V
    +-----+---------------------+
    I     I                     I
    I AFI I     I D I           I
    I     I                     I
    +-----+---------------------+
                 Figure 1:  NSAP Address Structure
 The components of this structure are as follows.
 IDP:  Initial Domain Part
    This is the part of the address whose entire content is
    standardized.  It consists of two parts, the AFI and the IDI.
 AFI:  Authority and Format Identifier
    This specifies the format of the IDI, the authority responsible
    for allocating IDI values, and the syntax of the DSP.
 IDI:  Initial Domain Identifier
    This identifies the subdomain from which DSP values are allocated,
    and the authority responsible for allocating the values.
 DSP:  Domain Specific Part
    The contents and semantics of the DSP are not specified in DIS
    8348/DAD2.  Its abstract syntax is however defined by the AFI.  In
    most cases, this means that the DSP abstract syntax can be either
    binary or decimal.
 IDI formats specified in DIS 8348/DAD2 identify a number of
 authorities for IDI allocation. These are:
    1.  X.121 (Public data network numbering)
    2.  F.69 (Telex numbering)

ANSI [Page 4]

RFC 982 April 1986 ANSI Guidelines

    3.  E.163 (Telephone numbering)
    4.  E.164 (ISDN numbering)
    5.  ISO DCC (Geographical address assignment under ISO authority.
        A subset of the DCC values used in X.121 have been used to
        designate the national addressing authorities)
    6.  ISO 6523-ICD (Non-geographic address assignment under ISO
        authority, using the International Code Designators according
        to ISO 6523)
    7.  Local (the IDI is null and the entire address is contained in
        the DSP).

6. Analysis

 (This section to be supplied)

7. Recommendations

 7.1  X.121 DSP format guidelines
    Description of Binary syntax
       The length of the DSP can be determined since the total address
       length is known, and the IDP has fixed length for any given AFI
       value.  If DSP is present, a DSP of 2 or less octets is an NSAP
       selector.  A DSP between 3 and 9 octets is interpreted in the
       manner described below.
       The length of the subnetwork identification is fixed at two
       octets  (16  bits).  The assignment of subnetwork
       identifications is under the control of the administering
       authority for the private domain, except that the value with
       both octets hex "FF" is reserved to indicate that the
       subnetwork is not explicitly identified.
       The length of the subnetwork address may be up to six octets,
       and is determined by the DSP length minus three octets.  For
       subnetworks using DIS 8802 MAC addressing, this field consists
       of the octets of the MAC address in the same order as they are
       defined in DIS 8802.
       The NSAP selector occupies a single octet.

ANSI [Page 5]

RFC 982 April 1986 ANSI Guidelines

    Description of Decimal syntax
       The length of the DSP can be determined since the total address
       length is known, and the IDP has fixed length for any given AFI
       value.  If DSP is present, a DSP of 8 or less decimal digits is
       an NSAP selector.  A DSP between 8 and 23 decimal digits is
       interpreted in the manner described below.
       The length of the subnetwork identification is fixed at five
       decimal  digits.  The assignment of subnetwork identifications
       is under the control of the administering authority for the
       private domain, except that a value of "99999" is reserved to
       indicate that the subnetwork is not explicitly identified.
       The length of the subnetwork address may be up to fifteen
       decimal digits, and is determined by the DSP length minus eight
       decimal digits.
       The NSAP selector occupies three decimal digits.
 7.2  ISO DCC DSP format guidelines
    Description of Binary syntax
       The length of the DSP can be determined since the total address
       length is known, and the IDP has fixed length for any given AFI
       value.  The length of the DSP is between 6 and 12 octets.
       The first three octets identify an organization which has been
       designated as an addressing authority.  This authority is
       responsible for assigning values to the remainder of the DSP.
       The length of the subnetwork identification is fixed at two
       octets (16 bits).  The assignment of subnetwork identifications
       is under the control of the administering authority for the
       private domain, except that the value with both octets hex "FF"
       is reserved to indicate that the subnetwork is not explicitly
       identified.
       The length of the subnetwork address may be up to six octets,
       and is determined by the DSP length minus three octets.  For
       subnetworks using DIS 8802 MAC addressing, this field consists
       of the octets of the MAC address in the same order as they are
       defined in DIS 8802.
       The NSAP selector occupies a single octet.

ANSI [Page 6]

RFC 982 April 1986 ANSI Guidelines

    Description of Decimal syntax
       The length of the DSP can be determined since the total address
       length is known, and the IDP has fixed length for any given AFI
       value.  The length of the DSP is between 14 and 29 decimal
       digits.
       The first six digits identify an organization which as been
       designated as an addressing authority.  This authority is
       responsible for assigning values to the remainder of the DSP.
       The length of the subnetwork identification is fixed at five
       decimal digits.  The assignment of subnetwork identifications
       is under the control of the administering authority for the
       private domain, except that a value of "99999" is reserved to
       indicate that the subnetwork is not explicitly identified.
       The length of the subnetwork address may be up to fifteen
       decimal digits, and is determined by the DSP length minus eight
       decimal digits.
       The NSAP selector occupies three decimal digits.
 7.3  F.69 DSP format guidelines
    Description of Binary syntax
       The length of the DSP can be determined since the total address
       length is known, and the IDP has fixed length for any given AFI
       value.  If DSP is present, a DSP of 2 or less octets is an NSAP
       selector.  A DSP between 3 and 9 octets is interpreted in the
       manner described below.  Interpretation of a DSP greater than 9
       octets in length is not specified in this report.
       The length of the subnetwork identification is fixed at two
       octets (16 bits).  The assignment of subnetwork identifications
       is under the control of the administering authority for the
       private domain, except that the value with both octets hex "FF"
       is reserved to indicate that the subnetwork is not explicitly
       identified.
       The length of the subnetwork address may be up to six octets,
       and is determined by the DSP length minus three octets.  For
       subnetworks using DIS 8802 MAC addressing, this field consists
       of the octets of the MAC address in the same order as they are
       defined in DIS 8802.

ANSI [Page 7]

RFC 982 April 1986 ANSI Guidelines

       The NSAP selector occupies a single octet.
    Description of Decimal syntax
       The length of the DSP can be determined since the total address
       length is known, and the IDP has fixed length for any given AFI
       value.  If DSP is present, a DSP of 8 or less decimal digits is
       an NSAP selector.  A DSP between 8 and 23 decimal digits is
       interpreted in the manner described below.  Interpretation of a
       DSP greater than 23 decimal digits in length is not specified
       in this report.
       The length of the subnetwork identification is fixed at five
       decimal digits.  The assignment of subnetwork identifications
       is under the control of the administering authority for the
       private domain, except that a value of "99999" is reserved to
       indicate that the subnetwork is not explicitly identified.
       The length of the subnetwork address may be up to fifteen
       decimal digits, and is determined by the DSP length minute
       eight decimal digits.
       The NSAP selector occupies three decimal digits.
 7.4  E.163 DSP format guidelines
    Description of Binary syntax
       The length of the DSP can be determined since the total address
       length is known, and the IDP has fixed length for any given AFI
       value.  If DSP is present, a DSP of 2 or less octets is an NSAP
       selector.  A DSP between 3 and 9 octets is interpreted in the
       manner described below.  Interpretation of a DSP greater than 9
       octets in length is not specified in this report.
       The length of the subnetwork identification is fixed at two
       octets (16 bits).  The assignment of subnetwork identifications
       is under the control of the administering authority for the
       private domain, except that the value with both octets hex "FF"
       is reserved to indicate that the subnetwork is not explicitly
       identified.
       The length of the subnetwork address may be up to six octets,
       and is determined by the DSP length minus three octets.  For
       subnetworks using DIS 8802 MAC addressing, this field consists
       of the octets of the MAC address in the same order as they are
       defined in DIS 8802.

ANSI [Page 8]

RFC 982 April 1986 ANSI Guidelines

       The NSAP selector occupies a single octet.
    Description of Decimal syntax
       The length of the DSP can be determined since the total address
       length is known, and the IDP has fixed length for any given AFI
       value.  If DSP is present, a DSP of 8 or less decimal digits is
       an NSAP selector.  A DSP between 8 and 23 decimal digits is
       interpreted in the manner described below.  Interpretation of a
       DSP greater than 23 decimal digits in length is not specified
       in this report.
       The length of the subnetwork identification is fixed at five
       decimal digits.  The assignment of subnetwork identifications
       is under the control of the administering authority for the
       private domain, except that a value of "99999" is reserved to
       indicate that the subnetwork is not explicitly identified.
       The length of the subnetwork address may be up to fifteen
       decimal digits, and is determined by the DSP length minus eight
       decimal digits.
       The NSAP selector occupies three decimal digits.
 7.5  E.164 DSP format guidelines
    Description of Binary syntax
       The length of the DSP can be determined since the total address
       length is known, and the IDP has fixed length for any given AFI
       value.  If DSP is present, a DSP of 2 or less octets is an NSAP
       selector.  A DSP between 3 and 9 octets is interpreted in the
       manner described below.  Interpretation of a DSP greater than 9
       octets in length is not specified in this report.
       The length of the subnetwork identification is fixed at two
       octets (16 bits).  The assignment of subnetwork identifications
       is under the control of the administering authority for the
       private domain, except that the value with both octets hex "FF"
       is reserved to indicate that the subnetwork is not explicitly
       identified.
       The length of the subnetwork address may be up to six octets,
       and is determined by the DSP length minus three octets.  For
       subnetworks using DIS 8802 MAC addressing, this field consists
       of the octets of the MAC address in the same order as they are
       defined in DIS 8802.

ANSI [Page 9]

RFC 982 April 1986 ANSI Guidelines

       The NSAP selector occupies a single octet.
    Description of Decimal syntax
       The length of the DSP can be determined since the total address
       length is known, and the IDP has fixed length for any given AFI
       value.  If DSP is present, a DSP of 8 or less decimal digits is
       an NSAP selector.  A DSP between 8 and 23 decimal digits is
       interpreted in the manner described below.  Interpretation of a
       DSP greater than 23 decimal digits in length is not specified
       in this report.
       The length of the subnetwork identification is fixed at five
       decimal digits.  The assignment of subnetwork identifications
       is under the control of the administering authority for the
       private domain, except that a value of "99999" is reserved to
       indicate that the subnetwork is not explicitly identified.
       The length of the subnetwork address may be up to fifteen
       decimal digits, and is determined by the DSP length minus eight
       decimal digits.
       The NSAP selector occupies three decimal digits.
 7.6  ISO 6523-ICD DSP format guidelines
    Description of Binary syntax
       The length of the DSP can be determined since the total address
       length is known, and the IDP has fixed length for any given AFI
       value.  The length of the DSP is between 5 and 11 octets.
       The first two octets identify an organization which has been
       designated as an addressing authority.  This authority is
       responsible for assigning values to the remainder of the DSP.
       The length of the subnetwork identification is fixed at two
       octets (16 bits).  The assignment of subnetwork identifications
       is under the control of the administering authority for the
       private domain, except that the value with both octets hex "FF"
       is reserved to indicate that the subnetwork is not explicitly
       identified.
       The length of the subnetwork address may be up to six octets,
       and is determined by the DSP length minus three octets.  For

ANSI [Page 10]

RFC 982 April 1986 ANSI Guidelines

       subnetworks using DIS 8802 MAC addressing, this field consists
       of the octets of the MAC address in the same order as they are
       defined in DIS 8802.
       The NSAP selector occupies a single octet.
    Description of Decimal syntax
       The length of the DSP can be determined since the total address
       length is known, and the IDP has fixed length for any given AFI
       value.  The length of the DSP is between 12 and 27 decimal
       digits.
       The first four digits identify an organization which has been
       designated as an addressing authority.  This authority is
       responsible for assigning values to the remainder of the DSP.
       The length of the subnetwork identification is fixed at five
       decimal digits.  The assignment of subnetwork identifications
       is under the control of the administering authority for the
       private domain, except that a value of "99999" is reserved to
       indicate that the subnetwork is not explicitly identified.
       The length of the subnetwork address may be up to fifteen
       decimal digits, and is determined by the DSP length minus eight
       decimal digits.
       The NSAP selector occupies three decimal digits.
 7.7  Local DSP format guidelines
    No recommendations made.

ANSI [Page 11]

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