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Ch23

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tejindershami

The document discusses Simple Network Management Protocol (SNMP). It describes SNMP's components including the Structure of Management Information (SMI) which defines naming rules and encoding of objects, and Management Information Bases (MIB) which define collections of objects and their relationships. It also discusses SNMP messages for reading and changing object values in SNMP packets, using UDP port 161 for communication.

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Chapter 23 Simple Network Management Protocol (SNMP)
CONTENTS CONCEPT MANAGEMENT COMPONENTS SMI MIB SNMP MESSAGES UDP PORTS SECURITY
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) of objects (variables) in SNMP packets.
SMI defines the general rules for naming objects, defining object types (including range and length), and showing how to encode objects and values.
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.
MIB creates a collection of named objects, their types, and their relationships to each other in an entity to be managed.
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.
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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