SNMPV1: Communication and Functional Models

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SNMPV1 Communication and Functional Models

• Sri Sharma
• Oakland University
• Winter 2004

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SNMP Architecture

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SNMP Messages

• Get-Request
• Get-Next-Request
• Set-Request
• Get-Response
• Trap
• Generic trap
• Specific trap
• Time stamp

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Administrative Model

• Based on community profile and policy
• SNMP Entities
• SNMP application entities - Reside in
  management stations and network elements
  - Manager and agent
• SNMP protocol entities - Communication
  processes (PDU handlers) - Peer processes that
  support application entities

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SNMP Community

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Community Profile

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Administration Model

• Administration model is SNMP access policy
• SNMP community paired with SNMP community
  profile is SNMP access policy

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Access Policy

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Generalized Administration Model

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Proxy Access Policy

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Protocol Entities

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Get and Set PDU

• VarBindList multiple instances of VarBind pairs

PDU Types enumerated INTEGER
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Error in Response

Error Index No. of VarBind that the first error
occurred
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Trap PDU

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SNMP Operations

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Lexicographic Order

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MIB Lexicographic Order

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A More Complex MIB Example

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Get-Next-Request Operation

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Get-Next-Request Operation

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Sniffer Data

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SNMP MIB