Question(s):        9/7

SOURCE:          ITU-T Study Group 7

TITLE:               ASN.1:1997 as the notation for SMIng



TO:                    IETF / SMIng working group

FOR:                  Information

APPROVAL:     ITU-T Study Group 7

CONTACT:       Olivier Dubuisson                                     Tel:         +33 2 96 05 38 50

                          France Télécom R&D                              Fax:        +33 2 96 05 39 45

                          France                                                     Email:                                                                         



ITU-T SG 7 Q.9/7 has carefully studied the requirements for the notation to be used to specify SMIng and concludes that it has an available notation that in our understanding fully meets those requirements (even the optional ones). This is a mature notation which is well supported by a number of commercial and public domain tools.

Q.9/7 experts plan to attend the next IETF meeting to be held in Salt Lake City, 9-14 December 2001. We also invite discussion at any upcoming meeting of Q.9/7 (Q.12/17 from September 17 onwards), and will present the notation and discuss with the SMIng group any modifications that may result from open issues that could not directly be identified from the requirements document.

ITU-T sees many advantages in the use of an existing and mature notation, both technically and from the point of view of extending ITU-T and IETF collaboration.

The primary specification of the notation and its semantics would be by using the Information Object Class notation and its WITH SYNTAX clause from the 1997 edition of ASN.1 (now available free on the web, see http://asn1.elibel/ This primary definition can be readily mapped to an ABNF specification of the syntax, which could be included as an Annex to the SMIng RFC.

The SMIng group will recognize that the Information Object Class notation was introduced in 1994 to replace the ASN.1 Macro notation (which was found to have many flaws) and has many similarities with that notation. Thus it will be familiar to those who know the existing SMI.