rfc1442.txt
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Network Working Group J. Case
Request for Comments: 1442 SNMP Research, Inc.
K. McCloghrie
Hughes LAN Systems
M. Rose
Dover Beach Consulting, Inc.
S. Waldbusser
Carnegie Mellon University
April 1993
Structure of Management Information
for version 2 of the
Simple Network Management Protocol (SNMPv2)
Status of this Memo
This RFC specifes an IAB standards track protocol for the
Internet community, and requests discussion and suggestions
for improvements. Please refer to the current edition of the
"IAB Official Protocol Standards" for the standardization
state and status of this protocol. Distribution of this memo
is unlimited.
Table of Contents
1 Introduction .......................................... 2
1.1 A Note on Terminology ............................... 3
2 Definitions ........................................... 4
3.1 The MODULE-IDENTITY macro ........................... 5
3.2 Object Names and Syntaxes ........................... 7
3.3 The OBJECT-TYPE macro ............................... 10
3.5 The NOTIFICATION-TYPE macro ......................... 12
3 Information Modules ................................... 13
3.1 Macro Invocation .................................... 13
3.1.1 Textual Clauses ................................... 14
3.2 IMPORTing Symbols ................................... 14
4 Naming Hierarchy ...................................... 16
5 Mapping of the MODULE-IDENTITY macro .................. 17
5.1 Mapping of the LAST-UPDATED clause .................. 17
5.2 Mapping of the ORGANIZATION clause .................. 17
5.3 Mapping of the CONTACT-INFO clause .................. 17
5.4 Mapping of the DESCRIPTION clause ................... 17
5.5 Mapping of the REVISION clause ...................... 17
5.6 Mapping of the DESCRIPTION clause ................... 18
5.7 Mapping of the MODULE-IDENTITY value ................ 18
5.8 Usage Example ....................................... 19
Case, McCloghrie, Rose & Waldbusser [Page i]
RFC 1442 SMI for SNMPv2 April 1993
6 Mapping of the OBJECT-IDENTITY macro .................. 20
6.1 Mapping of the STATUS clause ........................ 20
6.2 Mapping of the DESCRIPTION clause ................... 20
6.3 Mapping of the REFERENCE clause ..................... 20
6.4 Mapping of the OBJECT-IDENTITY value ................ 20
6.5 Usage Example ....................................... 21
7 Mapping of the OBJECT-TYPE macro ...................... 22
7.1 Mapping of the SYNTAX clause ........................ 22
7.1.1 Integer32 and INTEGER ............................. 22
7.1.2 OCTET STRING ...................................... 23
7.1.3 OBJECT IDENTIFIER ................................. 23
7.1.4 BIT STRING ........................................ 23
7.1.5 IpAddress ......................................... 23
7.1.6 Counter32 ......................................... 24
7.1.7 Gauge32 ........................................... 24
7.1.8 TimeTicks ......................................... 24
7.1.9 Opaque ............................................ 25
7.1.10 NsapAddress ...................................... 25
7.1.11 Counter64 ........................................ 26
7.1.12 UInteger32 ....................................... 26
7.2 Mapping of the UNITS clause ......................... 26
7.3 Mapping of the MAX-ACCESS clause .................... 27
7.4 Mapping of the STATUS clause ........................ 27
7.5 Mapping of the DESCRIPTION clause ................... 27
7.6 Mapping of the REFERENCE clause ..................... 28
7.7 Mapping of the INDEX clause ......................... 28
7.7.1 Creation and Deletion of Conceptual Rows .......... 30
7.8 Mapping of the AUGMENTS clause ...................... 31
7.8.1 Relation between INDEX and AUGMENTS clauses ....... 31
7.9 Mapping of the DEFVAL clause ........................ 32
7.10 Mapping of the OBJECT-TYPE value ................... 33
7.11 Usage Example ...................................... 35
8 Mapping of the NOTIFICATION-TYPE macro ................ 37
8.1 Mapping of the OBJECTS clause ....................... 37
8.2 Mapping of the STATUS clause ........................ 37
8.3 Mapping of the DESCRIPTION clause ................... 37
8.4 Mapping of the REFERENCE clause ..................... 37
8.5 Mapping of the NOTIFICATION-TYPE value .............. 38
8.6 Usage Example ....................................... 39
9 Refined Syntax ........................................ 40
10 Extending an Information Module ...................... 41
10.1 Object Assignments ................................. 41
10.2 Object Definitions ................................. 41
10.3 Notification Definitions ........................... 42
Case, McCloghrie, Rose & Waldbusser [Page ii]
RFC 1442 SMI for SNMPv2 April 1993
11 Appendix: de-OSIfying a MIB module ................... 43
11.1 Managed Object Mapping ............................. 43
11.1.1 Mapping to the SYNTAX clause ..................... 44
11.1.2 Mapping to the UNITS clause ...................... 45
11.1.3 Mapping to the MAX-ACCESS clause ................. 45
11.1.4 Mapping to the STATUS clause ..................... 45
11.1.5 Mapping to the DESCRIPTION clause ................ 45
11.1.6 Mapping to the REFERENCE clause .................. 45
11.1.7 Mapping to the INDEX clause ...................... 45
11.1.8 Mapping to the DEFVAL clause ..................... 45
11.2 Action Mapping ..................................... 46
11.2.1 Mapping to the SYNTAX clause ..................... 46
11.2.2 Mapping to the MAX-ACCESS clause ................. 46
11.2.3 Mapping to the STATUS clause ..................... 46
11.2.4 Mapping to the DESCRIPTION clause ................ 46
11.2.5 Mapping to the REFERENCE clause .................. 46
11.3 Event Mapping ...................................... 46
11.3.1 Mapping to the STATUS clause ..................... 47
11.3.2 Mapping to the DESCRIPTION clause ................ 47
11.3.3 Mapping to the REFERENCE clause .................. 47
12 Acknowledgements ..................................... 48
13 References ........................................... 52
14 Security Considerations .............................. 54
15 Authors' Addresses ................................... 54
Case, McCloghrie, Rose & Waldbusser [Page 1]
RFC 1442 SMI for SNMPv2 April 1993
1. Introduction
A network management system contains: several (potentially
many) nodes, each with a processing entity, termed an agent,
which has access to management instrumentation; at least one
management station; and, a management protocol, used to convey
management information between the agents and management
stations. Operations of the protocol are carried out under an
administrative framework which defines both authentication and
authorization policies.
Network management stations execute management applications
which monitor and control network elements. Network elements
are devices such as hosts, routers, terminal servers, etc.,
which are monitored and controlled through access to their
management information.
Management information is viewed as a collection of managed
objects, residing in a virtual information store, termed the
Management Information Base (MIB). Collections of related
objects are defined in MIB modules. These modules are written
using a subset of OSI's Abstract Syntax Notation One (ASN.1)
[1]. It is the purpose of this document, the Structure of
Management Information (SMI), to define that subset.
The SMI is divided into three parts: module definitions,
object definitions, and, trap definitions.
(1) Module definitions are used when describing information
modules. An ASN.1 macro, MODULE-IDENTITY, is used to
concisely convey the semantics of an information module.
(2) Object definitions are used when describing managed
objects. An ASN.1 macro, OBJECT-TYPE, is used to
concisely convey the syntax and semantics of a managed
object.
(3) Notification definitions are used when describing
unsolicited transmissions of management information. An
ASN.1 macro, NOTIFICATION-TYPE, is used to concisely
convey the syntax and semantics of a notification.
Case, McCloghrie, Rose & Waldbusser [Page 2]
RFC 1442 SMI for SNMPv2 April 1993
1.1. A Note on Terminology
For the purpose of exposition, the original Internet-standard
Network Management Framework, as described in RFCs 1155, 1157,
and 1212, is termed the SNMP version 1 framework (SNMPv1).
The current framework is termed the SNMP version 2 framework
(SNMPv2).
Case, McCloghrie, Rose & Waldbusser [Page 3]
RFC 1442 SMI for SNMPv2 April 1993
2. Definitions
SNMPv2-SMI DEFINITIONS ::= BEGIN
-- the path to the root
internet OBJECT IDENTIFIER ::= { iso 3 6 1 }
directory OBJECT IDENTIFIER ::= { internet 1 }
mgmt OBJECT IDENTIFIER ::= { internet 2 }
experimental OBJECT IDENTIFIER ::= { internet 3 }
private OBJECT IDENTIFIER ::= { internet 4 }
enterprises OBJECT IDENTIFIER ::= { private 1 }
security OBJECT IDENTIFIER ::= { internet 5 }
snmpV2 OBJECT IDENTIFIER ::= { internet 6 }
-- transport domains
snmpDomains OBJECT IDENTIFIER ::= { snmpV2 1 }
-- transport proxies
snmpProxys OBJECT IDENTIFIER ::= { snmpV2 2 }
-- module identities
snmpModules OBJECT IDENTIFIER ::= { snmpV2 3 }
Case, McCloghrie, Rose & Waldbusser [Page 4]
RFC 1442 SMI for SNMPv2 April 1993
-- definitions for information modules
MODULE-IDENTITY MACRO ::=
BEGIN
TYPE NOTATION ::=
"LAST-UPDATED" value(Update UTCTime)
"ORGANIZATION" Text
"CONTACT-INFO" Text
"DESCRIPTION" Text
RevisionPart
VALUE NOTATION ::=
value(VALUE OBJECT IDENTIFIER)
RevisionPart ::=
Revisions
| empty
Revisions ::=
Revision
| Revisions Revision
Revision ::=
"REVISION" value(Update UTCTime)
"DESCRIPTION" Text
-- uses the NVT ASCII character set
Text ::= """" string """"
END
Case, McCloghrie, Rose & Waldbusser [Page 5]
RFC 1442 SMI for SNMPv2 April 1993
OBJECT-IDENTITY MACRO ::=
BEGIN
TYPE NOTATION ::=
"STATUS" Status
"DESCRIPTION" Text
ReferPart
VALUE NOTATION ::=
value(VALUE OBJECT IDENTIFIER)
Status ::=
"current"
| "obsolete"
ReferPart ::=
"REFERENCE" Text
| empty
Text ::= """" string """"
END
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