rfc1095.txt

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Network Working Group                                         U. Warrier
Request for Comments: 1095                            Unisys Corporation
                                                                L. Besaw
                                                         Hewlett-Packard
                                                              April 1989


  The Common Management Information Services and Protocol over TCP/IP
                                 (CMOT)

                        Table of Contents

1. Status of this Memo ............................................    3
2. Introduction ...................................................    4
Part I: Concepts and Models .......................................    7
3. The OSI Management Framework ...................................    7
3.1. Architectural Overview .......................................    7
3.2. Management Models ............................................    8
3.2.1. The Organizational Model ...................................    8
3.2.2. The Functional Model .......................................    8
3.2.3. The Information Model ......................................    9
3.3. ISO Application Protocols ....................................    9
3.3.1. ACSE .......................................................   10
3.3.2. ROSE .......................................................   10
3.3.3. CMISE ......................................................   10
3.3.3.1. Management Association Services ..........................   11
3.3.3.2. Management Notification Services .........................   12
3.3.3.3. Management Operation Services ............................   12
4. The CMOT Architecture ..........................................   13
4.1. Management Models ............................................   13
4.1.1. The Organizational Model ...................................   13
4.1.2. The Functional Model .......................................   14
4.1.3. The Information Model ......................................   14
4.2. Protocol Architecture ........................................   14
4.2.1 The Lightweight Presentation Layer ..........................   15
4.2.2 The Quality of Transport Service ............................   16
4.3. Proxy Management .............................................   17
4.4. Directory Service ............................................   18
5. Management Information .........................................   18
5.1. The Structure of Management Information ......................   19
5.1.1. The ISO SMI ................................................   19
5.1.1.1. Managed Objects and Attributes ...........................   19
5.1.1.2. Management Information Hierarchies .......................   20
5.1.1.2.1 The Registration Hierarchy ..............................   20
5.1.1.2.2. The Containment Hierarchy ..............................   20
5.1.1.2.3. The Inheritance Hierarchy ..............................   22
5.1.2. The Internet SMI ...........................................   22
5.2. The Management Information Base ..............................   23



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5.3. An Interpretation of the Internet SMI ........................   24
5.3.1. Object Class and Attributes ................................   25
5.3.1.1. Object Class .............................................   25
5.3.1.2. Attribute Identifier .....................................   26
5.3.2. Management Information Hierarchies .........................   26
5.3.2.1. The Registration Hierarchy ...............................   26
5.3.2.2. The Containment Hierarchy ................................   26
5.3.2.3. The Inheritance Hierarchy ................................   28
5.4. Scoping, Filtering, and Synchronization ......................   28
5.4.1. Scoping ....................................................   28
5.4.2. Filtering ..................................................   29
5.4.3. Synchronization ............................................   29
5.4.4. Linked Replies .............................................   29
5.5. Accessing Tables .............................................   29
5.5.1. Accessing Whole Tables .....................................   30
5.5.2. Accessing Table Entries ....................................   30
Part II: Protocol Agreements ......................................   32
6. CMOT Protocol Overview .........................................   32
6.1. The CMOT Protocol Suite ......................................   32
6.2. Conformance Requirements .....................................   33
6.3. Abstract Syntax Notation .....................................   33
7. Common Management Information Service Element ..................   34
7.1. CMIS Services ................................................   34
7.1.1. CMIS Services Overview .....................................   34
7.1.2. Functional Units ...........................................   34
7.1.3. Functional Unit Groups .....................................   36
7.1.4. M-INITIALISE Parameters ....................................   37
7.1.4.1. Functional Units .........................................   37
7.1.4.2. User Information .........................................   39
7.1.4.3. Access Control ...........................................   39
7.2. Supporting Services ..........................................   39
7.3. CMIP Agreements ..............................................   39
7.3.1. Invoke Identifier ..........................................   39
7.3.2. Object Class ...............................................   40
7.3.3. Object Instance ............................................   40
7.3.4. Access Control .............................................   41
7.3.5. Synchronization ............................................   41
7.3.6. Scope ......................................................   41
7.3.7. Filter .....................................................   41
7.3.8. Attribute Identifier .......................................   42
7.3.9. Event Type Identifier ......................................   42
7.3.10. Action Type Identifier ....................................   42
7.3.11. Time Fields ...............................................   43
7.3.12. Response PDUs .............................................   43
7.3.13. Error PDUs ................................................   43
8. Association Control Service Element ............................   43
8.1. ACSE Services ................................................   44
8.2. Supporting Services ..........................................   44



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8.3. ACSE Protocol ................................................   45
8.3.1. Application Context Name ...................................   45
8.3.2. User Information ...........................................   45
8.3.3. Presentation Service Parameters ............................   46
9. Remote Operations Service Element ..............................   46
9.1. ROSE Services ................................................   46
9.2. Supporting Services ..........................................   47
9.3. ROSE Protocol ................................................   47
9.3.1. Operation Class ............................................   47
9.3.2. Priority ...................................................   48
10. Lightweight Presentation ......................................   48
10.1. Lightweight Presentation Services ...........................   48
10.2. Supporting Services .........................................   48
10.3. Lightweight Presentation Protocol ...........................   49
11. Acknowledgements ..............................................   49
12. References ....................................................   49
Appendix A - The CMOT Group .......................................   52
Appendix B - Management Information Summary .......................   53
Appendix C - Sample Protocol Exchanges ............................   60

1.  Status of this Memo

   This memo defines a network management architecture that uses the
   International Organization for Standardization's (ISO) Common
   Management Information Services/Common Management Information
   Protocol (CMIS/CMIP) in a TCP/IP environment.  This architecture
   provides a means by which control and monitoring information can be
   exchanged between a manager and a remote network element.  In
   particular, this memo defines the means for implementing the Draft
   International Standard (DIS) version of CMIS/CMIP on top of Internet
   transport protocols for the purpose of carrying management
   information defined in the Internet-standard management information
   base.  DIS CMIS/CMIP is suitable for deployment in TCP/IP networks
   while CMIS/CMIP moves toward becoming an International Standard.
   Together with the relevant ISO standards and the companion RFCs that
   describe the initial structure of management information and
   management information base, these documents provide the basis for a
   comprehensive architecture and system for managing TCP/IP-based
   internets, and in particular the Internet.

   The Internet Activities Board (IAB) has designated two different
   network management protocols with the same status of "Draft Standard"
   and "Recommended".

   The two protocols are the Common Management Information Services and
   Protocol over TCP/IP (CMOT) (this memo) and the Simple Network
   Management Protocol (SNMP) [4].




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   The IAB intends each of these two protocols to receive the attention
   of implementers and experimenters.  The IAB seeks reports of
   experience with these two protocols from system builders and users.

   By this action, the IAB recommends that all IP and TCP
   implementations be network manageable (e.g., implement the Internet
   MIB [3], and that implementations that are network manageable are
   expected to adopt and implement at least one of these two Internet
   Draft Standards.

   Distribution of this memo is unlimited.

2.  Introduction

   As reported in RFC 1052, "IAB Recommendations for the Development of
   Internet Network Management Standards" [1], the Internet Activities
   Board (IAB) has directed the Internet Engineering Task Force (IETF)
   to coordinate the work of three working groups in the area of network
   management. First, the MIB working group was charged with the
   specification and definition of elements to be included in the
   Management Information Base (MIB).  Second, the SNMP working group
   was charged with defining the modifications to the Simple Network
   Management Protocol (SNMP) necessary to accommodate the short-term
   needs of the network vendor and operations communities.  Third, the
   Netman working group was directed to meet the longer-term needs of
   the Internet community by developing a network management system
   based on ISO CMIS/CMIP.  Both the Netman working group and the SNMP
   working group were directed to align their work with the output of
   the MIB working group in order to ensure compatibility of management
   information between the short-term and long-term approaches to the
   management of TCP/IP-based internets.  This will enable a smooth
   transition from the short-term protocol (SNMP) to the long-term
   protocol (CMIP).

   The MIB working group has produced two memos.  RFC 1065 [2] defines
   the Structure of Management Information (SMI) that is necessary for
   naming and defining managed objects in the MIB.  RFC 1066 [3] defines
   the list of managed objects contained in the initial TCP/IP MIB.  The
   SNMP working group has produced a memo [4] giving the protocol
   specification for SNMP and providing the SNMP protocol-specific
   interpretation of the Internet-standard MIB defined in RFC 1066.

   This memo is the output of the Netman working group.  As directed by
   the IAB in RFC 1052, it addresses the need for a long-term network
   management system based on ISO CMIS/CMIP.  The network management
   approach of using ISO protocols in a TCP/IP environment to manage
   TCP/IP networks can be described as "CMIP Over TCP/IP" (CMOT).  This
   memo specifies the CMOT architecture and the protocol agreements



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   necessary to implement CMIP and accompanying ISO protocols over the
   TCP and UDP transport protocols.  In addition, this memo provides an
   interpretation of RFC 1066 that makes it possible to use CMIP to
   convey management information defined in the Internet-standard MIB.

   There is widespread vendor support for the CMOT approach to network
   management.  This is amply shown by the Netman demonstration of
   prototype CMOT implementations at the Interop '88 TCP/IP
   Interoperability Conference.  The demonstration also showed the
   feasibility and power of the CMIS/CMIP framework for multivendor
   network management.  Now that CMIS/CMIP has been voted a Draft
   International Standard (DIS), many vendors feel that the ISO standard
   has become a stable basis for product development.  The clear need to
   standardize this development has led to the present profile of CMIP.
   It is expected that this profile will not change while the ISO
   standard moves from DIS status to International Standard (IS) status.
   If, however, the standard does change unexpectedly, the Netman
   working group will review such changes for appropriate action.

   Another rationale for the CMOT approach is that it will facilitate
   the early use of ISO network management standards in large
   operational networks.  This will make it possible for the Internet
   community to make valuable recommendations to ISO in the language of
   OSI management based on actual experience with the use and
   implementation of these standards.  There is continuing network
   management standards development work in ISO where such contributions
   would be valuable.

   The CMOT architecture is based on the Open Systems Interconnection
   (OSI) management framework and models developed by ISO.  This memo