TELE 301 Network Management
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1 TELE 301 Network Management Lecture 20: Management Tools and Protocols Haibo Zhang Computer Science, University of Otago TELE301 Lecture 20: Management tools and protocols 1
2 What is Network Management? Monitoring, testing, configuring, and trouble-shooting network components to meet a set of requirements defined by an organization. These requirements include the smooth, efficient, operation of the network that provides the predefined quality of service to users. TELE301 Lecture 20: Management tools and protocols 2
3 Why we Manage? Early Warning Aim to preempt causes of downtime Imminent failure: changes in rate of errors Planning Trend analysis & capacity planning Daily, weekly, yearly graphs. Statistical tools Monitoring Improve visibility of the network Better alerting, anomaly detection TELE301 Lecture 20: Management tools and protocols 3
4 Areas of Network Management Configuration Management Reconfiguration and documentation Hardware, software, user-account Fault Management Reactive: detect, isolate, correct, and record Proactive: tries to avoid faults from happening Performance Management Capacity, traffic, throughput, and response time Security Management Accounting Management Control user s access to network resources through charges TELE301 Lecture 20: Management tools and protocols 4
5 SNMP (1) Simple Network Management Protocol A framework for managing devices in an internet using the TCP/ IP protocol suite Provides a set of fundamental operations for monitoring and maintaining an internet Use the concept of manager and agent Agent: a managed station (router or host) that runs SNMP server program Manger: a host that runs the SNMP client program Agent Agent Agent Manager Agent variables Agent TELE301 Lecture 20: Management tools and protocols 5
6 SNMP (2) Basic ideas for management with SNMP SNMP is a client pull model Each agent (server) keeps performance information in a database. A manager (client) pulls data from the agent A manager forces an agent to perform a task by resetting values in the agent database SNMP is a server push model An agent (server) pushes out a trap message to the manager process (client) by warning the manager of an unusual situation TELE301 Lecture 20: Management tools and protocols 6
7 Management Components Management SNMP SMI MIB SMI (Structure of Management Information) Defines rules for naming objects, defining object types, and showing how to encode objects and values MIB (Management Information Base) Creates a collection of named objects, their types, and their relationship to each other SNMP Defines the format of packets exchanged between a manager and an agent It reads and changes the status of objects in SNMP packets TELE301 Lecture 20: Management tools and protocols 7
8 An Analogy Language syntax SMI Declaration and definition MIB Program coding SNMP Computer Programming Network Management TELE301 Lecture 20: Management tools and protocols 8
9 SMI Tree Each name object has a unique name (object identifier) ccitt(0) Root Node iso(1) org(3) dod(6) joint(2) Structure of Management Information internet(1) directory(1) mgmt(2) experimental(3) private(4) mib-2(1) system(1) interfaces(2) ip(4) snmp(11) host(25) TELE301 Lecture 20: Management tools and protocols 9
10 Tree Pointing (OIDs) Each object can be defined using a sequence of integers separated by dots (used in SNMP) Each object can also be defined using a sequence of textual names separated by dots (used by people) iso.org.dod.internet.mgmt.mib-2 <--> The objects that are used in SNMP are located under the mib-2 object. So their identifiers always start with TELE301 Lecture 20: Management tools and protocols 10
11 Object Data Types Simple data types INTEGER, OCTET STRING, IPAddress, Counter32, TimeTicks, Structured type Sequence: a combination of simple data types, not necessarily of the same type, Similar to a struct in C. Sequence of: a combination of simple data types all of the same type all a combination of sequence data types all of the same type. Similar to an array in C. TELE301 Lecture 20: Management tools and protocols 11
12 MIB Each agent has its own MIB, which is a collection of all the objects that the manager can manage The objects in MIB are categorized into several groups mib-2 sys if at ip icmp tcp udp egp cmot trans snmp TELE301 Lecture 20: Management tools and protocols 12
13 SNMP Uses both SMI and MIB Uses UDP protocol on port 161 (agent) and port 162 (manager) Defines eight types of protocol data units Client SNMP manager UDP GetRequest GetNextRequest GetBulkRequest SetRequest Response Trap Server SNMP agent InformRequest Report To another manager To another manager TELE301 Lecture 20: Management tools and protocols 13
14 Trap Asynchronous notification from agent to network management station When an interface changes state (up/down/testing) Some threshold is exceeded (e.g error rate) Authentication failure TELE301 Lecture 20: Management tools and protocols 14
15 SNMP Message Request-id Message Header Error-status Error-index Varbind List PDU variable value variable value TELE301 Lecture 20: Management tools and protocols 15
16 SNMP Versions Version 1 Very simple No encryption. Version 2 Introduced bulk operations Still no encryption Version 3 No changes to the protocol Primarily added security and remote configuration enhancements Changed architecture to user/view based access control with payload encryption. TELE301 Lecture 20: Management tools and protocols 16
17 Monitoring Architecture In-band or Out-of-band? Failover? Use in-band Remote admin needs? Use out-of-band Single or Distributed NMS? Distributed can be useful when you have caretaker IT support outside of normal business hours. TELE301 Lecture 20: Management tools and protocols 17
18 In-band vs. Out-of-band In-band Cost vs Reliability Out-of-band TELE301 Lecture 20: Management tools and protocols 18
19 NMS Applications NMS Suites mapping, database storage, pager alerts, extensibility, trend analysis Element managers generally configuration software that comes with the device, e.g. network printer admin utility Trend analysis graphs, forecasting, weather maps TELE301 Lecture 20: Management tools and protocols 19
20 Example (PHP Weathermap) TELE301 Lecture 20: Management tools and protocols 20
21 Server Monitoring There are SNMP MIBs for diverse types of services CPU statistics, e.g., percentages of idle CPU time: Memory Statistics, e.g., Total RAM used: Disk Statistics,.e.g., Available space on the disk: Extensible SNMP Agents extend a particular agent's MIB and retrieve values from an external source (a script, program, or file) TELE301 Lecture 20: Management tools and protocols 21
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