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1
Pertemuan 05Model Informasi - SMI
Matakuliah : H0372/Manajemen Jaringan
Tahun : 2005
Versi : 1/0
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Learning Outcomes
Pada akhir pertemuan ini, diharapkan mahasiswa
akan mampu :
• Menjelaskan model Information management
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Outline Materi
• SMI
• ASN.1
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Information Model
• Structure of Management Information (SMI)-RFC1155
• Managed Object• Scalar • Aggregate or tabular object
• Management Information Base (RFC 1213)
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SMI
• Structure of Management Information • SMI defines for a managed object
• Syntax• Semantics• Additional information such as status
• Example sysDescr : { system 1 } Syntax : OCTET STRING Definition : "A textual description of the entity " Access : read-only Status : mandatory
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Managed Object
• Managed objects can be• Network elements (hardware, system)
• Hubs, Bridges, Routers, Transmission facilities• Software (non-physical)
• Programs, Algorithms• Administrative information
• Contact person, Name of group of objects (IP group)
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OSI Managed Object
• Scalar object in Internet vs Object-oriented approach in OSI
• OSI characteristics of operations, behaviour, and notification are part of communication model in Internet: get/set and response/alarm
• Internet syntax is absorbed as part of OSI attributes• Internet access is part of OSI security model• Internet status is part of OSI conformance
application• OSI permits creation and deletion of objects; Internet
does not: Enhancement in SNMPv2
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Managed Object
Object
ObjectInstance
ObjectType
Encoding:BER
Syntax:ASN.1
Name:OBJECT
IDENTIFIER
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Abstract Syntax Notation One
• ASN.1 is more than a syntax; it’s a language• Addresses both syntax and semantics• Two type of syntax
• Abstract syntax: set of rules that specify data type and structure for information storage• Transfer syntax: set of rules for communicating information between systems
• Makes application layer protocols independent of lower layer protocols• Can generate machine-readable code: Basic Encoding Rules (BER) is used in management modules
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Management Information Tree
• iso International Standards Organization itu I nternational Telecommunications Union dod Department of Defense• Designation:
• iso 1• org 1.3• dod 1.3.6• internet 1.3.6.1
iso-itu2
itu0
iso1
org3
dod6
internet1
OSI Management Information Tree
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Internet Subnodes
directory OBJECT IDENTIFIER ::= {internet 1} mgmt OBJECT IDENTIFIER ::= {internet 2} experimental OBJECT IDENTIFIER ::= {internet 3} private OBJECT IDENTIFIER ::= {internet 4}
mgmt(2)
directory(1)
experimental(3)
private(4)
Internet{1 3 6 1}
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Object Name
• internet OBJECT IDENTIFIER ::= {ISO(1) ORG(3) DOD(6) INTERNET(1)}
iso-itu2
iso1
itu0
org3
dod6
internet1
private4
enterprise1
IBM2
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SNMP Data Type
SNMP ASN.1Data Type
Defined or Application
Contructor or Structured
Simple or Primitive
Number
Tag
Structure
Class
Universal Application Context-specific
Private