Chapter 23 Simple Network Management Protocol (SNMP)
CONTENTS <ul><li>CONCEPT </li></ul><ul><li>MANAGEMENT COMPONENTS </li></ul><ul><li>SMI </li></ul><ul><li>MIB </li></ul><ul...
CONCEPT 23.1
Figure  23-1 Concept
MANAGEMENT COMPONENTS 23.2
Figure  23-2 Components of network  management on the Internet
SNMP defines the format of packets  exchanged between a manager and  an agent.  It reads and changes the status  (values) ...
SMI defines the general rules for naming  objects, defining object types  (including range and length),  and showing how t...
SMI defines neither the  number of objects an entity  should manage,  nor names the  objects to be managed nor  defines th...
MIB creates a collection of named objects,  their types, and their relationships  to each other in  an entity to be manage...
We can compare the task of network  management to the task of writing  a program. 1. Both tasks need rules. In network    ...
SMI 23.3
Figure  23-3 Object attributes
Figure  23-4 Object  identifier
All objects managed by SNMP  are given an object identifier.  The object identifier always starts  with 1.3.6.1.2.1.
Figure  23-5 Data types
Figure  23-6 Conceptual data types
Figure  23-7 Encoding format
Figure  23-8 Length format
Figure  23-9 Example 1: INTEGER 14
Figure  23-10 Example 2: OCTET STRING “HI”
Figure  23-11 Example 3: ObjectIdentifier 1.3.6.1
Figure  23-12 Example 4: IPAddress 131.21.14.8
MIB 23.4
Figure  23-13 mib-2
Figure  23-14 udp group
Figure  23-15 udp variables and tables
Figure  23-16 Indexes for udpTable
Figure  23-17 Lexicographic ordering
SNMP 23.5
Figure  23-18 SNMP PDUs
Figure  23-19 SNMP PDU format
MESSAGES 23.6
Figure  23-20 SNMP message
Figure  23-21 GetRequest message
UDP PORTS 23.7
Figure  23-22 Port numbers for SNMP
23.8 SECURITY
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Ch23

  1. 1. Chapter 23 Simple Network Management Protocol (SNMP)
  2. 2. CONTENTS <ul><li>CONCEPT </li></ul><ul><li>MANAGEMENT COMPONENTS </li></ul><ul><li>SMI </li></ul><ul><li>MIB </li></ul><ul><li>SNMP </li></ul><ul><li>MESSAGES </li></ul><ul><li>UDP PORTS </li></ul><ul><li>SECURITY </li></ul>
  3. 3. CONCEPT 23.1
  4. 4. Figure 23-1 Concept
  5. 5. MANAGEMENT COMPONENTS 23.2
  6. 6. Figure 23-2 Components of network management on the Internet
  7. 7. SNMP defines the format of packets exchanged between a manager and an agent. It reads and changes the status (values) of objects (variables) in SNMP packets.
  8. 8. SMI defines the general rules for naming objects, defining object types (including range and length), and showing how to encode objects and values.
  9. 9. SMI defines neither the number of objects an entity should manage, nor names the objects to be managed nor defines the association between the objects and their values.
  10. 10. MIB creates a collection of named objects, their types, and their relationships to each other in an entity to be managed.
  11. 11. We can compare the task of network management to the task of writing a program. 1. Both tasks need rules. In network management this is handled by SMI. 2. Both tasks need variable declarations. In network management this is handled by MIB. 3. Both tasks have actions performed by statements.In network management this is handled by SNMP.
  12. 12. SMI 23.3
  13. 13. Figure 23-3 Object attributes
  14. 14. Figure 23-4 Object identifier
  15. 15. All objects managed by SNMP are given an object identifier. The object identifier always starts with 1.3.6.1.2.1.
  16. 16. Figure 23-5 Data types
  17. 17. Figure 23-6 Conceptual data types
  18. 18. Figure 23-7 Encoding format
  19. 19. Figure 23-8 Length format
  20. 20. Figure 23-9 Example 1: INTEGER 14
  21. 21. Figure 23-10 Example 2: OCTET STRING “HI”
  22. 22. Figure 23-11 Example 3: ObjectIdentifier 1.3.6.1
  23. 23. Figure 23-12 Example 4: IPAddress 131.21.14.8
  24. 24. MIB 23.4
  25. 25. Figure 23-13 mib-2
  26. 26. Figure 23-14 udp group
  27. 27. Figure 23-15 udp variables and tables
  28. 28. Figure 23-16 Indexes for udpTable
  29. 29. Figure 23-17 Lexicographic ordering
  30. 30. SNMP 23.5
  31. 31. Figure 23-18 SNMP PDUs
  32. 32. Figure 23-19 SNMP PDU format
  33. 33. MESSAGES 23.6
  34. 34. Figure 23-20 SNMP message
  35. 35. Figure 23-21 GetRequest message
  36. 36. UDP PORTS 23.7
  37. 37. Figure 23-22 Port numbers for SNMP
  38. 38. 23.8 SECURITY

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