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Java SNMP Oplet 
Tal Lavian
Goals 
• Portable across a range of devices 
• Extensible 
• Simple and convenient for client use 
• Consistent with SNMP model 
• Hide unnecessary SNMP details 
• Permit optimized access 
• Re-use MIB documentation
API Generation 
• Most of the Java code is generated 
automatically 
• ASN.1 MIB definitions are converted into 
Java classes 
• Documentation and commentary in the 
MIB definitions is placed as Javadoc 
formal comments 
• HTML documentation generated from 
Javadoc
MIB Objects 
• The MIB data model is structured as a 
tree 
• API represents MIB groups with Java 
classes 
• MIB variables are represented with 
accessor methods 
• Conceptual tables are represented with 
iterators 
• API converts SNMP data values into 
standard Java types
API Architecture 
Java 
Virtual 
Machine 
Client API 
Abstract Variable Interface 
MIB Map 
Native Variable Interface 
SNMP PDU Layer 
Instrumentation 
& Annotation 
Layer 
Real Time Operating System 
Processor and other Hardware 
Client Bean
Variable access 
• API uses a MIB Map to dispatch requests 
to variable access routines 
• Different parts of the MIB tree can be 
serviced by different mechanisms 
• Two main schemes: 
• An ad hoc interface to the SNMP 
instrumentation layer 
• A generic SNMP loopback
Advantages of MIB map 
• Allows immediate generic 
implementation of the entire MIB via the 
loopback scheme 
• Enables optimized native implementation 
of key MIB variables for maximum 
efficiency 
• Permits definition of pseudo-MIB 
variables for extending MIB dynamically 
• Provides site for centralized access 
management
Proxy mode 
• Uses SNMP loopback mechanism to 
target a remote network element 
• API can be used to control devices that 
don’t have an embedded JVM 
Cisco Router 
JVM on PC with No JVM 
Java Server 
Java “Optlet” 
JSNMP API 
Proxy mode 
SNMP

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Java SNMP Oplet

  • 1. Java SNMP Oplet Tal Lavian
  • 2. Goals • Portable across a range of devices • Extensible • Simple and convenient for client use • Consistent with SNMP model • Hide unnecessary SNMP details • Permit optimized access • Re-use MIB documentation
  • 3. API Generation • Most of the Java code is generated automatically • ASN.1 MIB definitions are converted into Java classes • Documentation and commentary in the MIB definitions is placed as Javadoc formal comments • HTML documentation generated from Javadoc
  • 4. MIB Objects • The MIB data model is structured as a tree • API represents MIB groups with Java classes • MIB variables are represented with accessor methods • Conceptual tables are represented with iterators • API converts SNMP data values into standard Java types
  • 5. API Architecture Java Virtual Machine Client API Abstract Variable Interface MIB Map Native Variable Interface SNMP PDU Layer Instrumentation & Annotation Layer Real Time Operating System Processor and other Hardware Client Bean
  • 6. Variable access • API uses a MIB Map to dispatch requests to variable access routines • Different parts of the MIB tree can be serviced by different mechanisms • Two main schemes: • An ad hoc interface to the SNMP instrumentation layer • A generic SNMP loopback
  • 7. Advantages of MIB map • Allows immediate generic implementation of the entire MIB via the loopback scheme • Enables optimized native implementation of key MIB variables for maximum efficiency • Permits definition of pseudo-MIB variables for extending MIB dynamically • Provides site for centralized access management
  • 8. Proxy mode • Uses SNMP loopback mechanism to target a remote network element • API can be used to control devices that don’t have an embedded JVM Cisco Router JVM on PC with No JVM Java Server Java “Optlet” JSNMP API Proxy mode SNMP