Chapter 23. Simple Network Management Protocol (SNMP)
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1 Chapter 23 Simple Network Management Protocol (SNMP) 1 The McGraw-Hill Companies, Inc.,
2 CONTENTS CONCEPT MANAGEMENT COMPONENTS SMI MIB SNMP MESSAGES UDP PORTS SECURITY 2 The McGraw-Hill Companies, Inc.,
3 23.1 Concept Manager checks Agent s performance Manager changes Agent s operating parameters Agent reports warnings to Manager A PC running the SNMP client program Router/ Switch/ Network Printer running the SNM Server program 3 The McGraw-Hill Companies, Inc.,
4 23.2 Components of network management on the Internet Structure of Management Information Management Information Base 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. 4 The McGraw-Hill Companies, Inc.,
5 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. 5 The McGraw-Hill Companies, Inc.,
6 23.3 SMI 6 The McGraw-Hill Companies, Inc.,
7 Object Identifiers All objects managed by SNMP are given an object identifier. The object identifier always starts with The McGraw-Hill Companies, Inc.,
8 Data Types 8 The McGraw-Hill Companies, Inc.,
9 Simple Data Types Integer32 Gauge32 BITS Opaque Type INTEGER Unsigned32 OCTET STRING OBJECT IDENTIFIER IPAddress Counter32 Counter64 TimeTicks Size (in bytes) Variable Variable Variable An integer to Same as INTEGER 0 to Byte-string up to 64K Bytes long An object identifier An IP address An integer whose value can be incremented from 0 to then wraps back to 0 A 64-bit counter Same as Counter32 but remains at its maximum value (without wrapping) until it is reset A counting value that records time in 1/100ths of a second A string of bits Uninterpreted string Description 9 The McGraw-Hill Companies, Inc.,
10 Structured Data Types 10 The McGraw-Hill Companies, Inc.,
11 TLV Encoding Format Type Tag (Hex) Type Tag (Hex) INTEGER 02 IPAddress 40 OCTET STRING 04 Counter 41 OBJECT IDENTIFIER 06 Gauge 42 NULL 05 TimeTicks 43 Sequence, sequence of 30 Opaque The McGraw-Hill Companies, Inc.,
12 Length Format 12 The McGraw-Hill Companies, Inc.,
13 Example 1: The 32-bit INTEGER The McGraw-Hill Companies, Inc.,
14 Example 2: OCTET STRING HI 14 The McGraw-Hill Companies, Inc.,
15 Example 3: The ObjectIdentifier The McGraw-Hill Companies, Inc.,
16 Example 4: The IPAddress The McGraw-Hill Companies, Inc.,
17 23.4 Management Information Base (MIB ver. 2) Each agent (i.e. managed network device) has its own MIB2, a collection of all manageable objects inside the agent. MIB2 classifies the objects into 10 groups 17 The McGraw-Hill Companies, Inc.,
18 Accessing MIB Variable. Example: UDP MIB2 udpindatagram : The value (instance) udplocalport: The McGraw-Hill Companies, Inc.,
19 udp variables and tables 19 The McGraw-Hill Companies, Inc.,
20 Indexes for udptable 20 The McGraw-Hill Companies, Inc.,
21 Lexicographic ordering 21 The McGraw-Hill Companies, Inc.,
22 23.5 SNMP PDUs (8 PDUs) A0 A1 A5 A3 A2 A7 A6 A8 22 The McGraw-Hill Companies, Inc.,
23 SNMP PDU format 23 The McGraw-Hill Companies, Inc.,
24 23.6 SNMP message 24 The McGraw-Hill Companies, Inc.,
25 GetRequest message 25 The McGraw-Hill Companies, Inc.,
26 23.7 Port numbers for SNMP 26 The McGraw-Hill Companies, Inc.,
Chapter 28 Network Management: SNMP Copyright The McGraw-Hill Companies, Inc. Permission required for reproduction or display.
Chapter 28 Network Management: SNMP 28.1 Copyright The McGraw-Hill Companies, Inc. Permission required for reproduction or display. 28-1 NETWORK MANAGEMENT SYSTEM We can say that the functions performed
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