Chapter 3 Overview

1. Chapter 3 Overview • Why is a network implementation strategy necessary? • Why is network mgmt strategy needed? • Principles of network design • ISO network mgmt categories • Overview of network mgmt tools • Network mgmt strategy used in textbook Chapter 3  Network Implementation and Management Strategies 1

2. Network Implementation Strategy • Why is this necessary? • Network is essential today • “There are 3 kinds of death in this world. There’s heart death, there’s brain death, and there’s being off the network.”  Guy Almes • Network must serve organization today • Network must scale if needed in future • Better to plan in advance Chapter 3  Network Implementation and Management Strategies 2

3. Network Mgmt Strategy • Why is such a strategy needed? • Consider a university campus • Campus admins delegate work to depts • Performance, availability, etc., at dept level may cause problems at the university level… • …and vice-versa • Campus level must be able to monitor and coordinate all network mgmt activities • Similar issues arise in any large organization Chapter 3  Network Implementation and Management Strategies 3

4. Network Design • ISO defines 5 network mgmt categories • Network design is “like a 6th category” • Good design makes mgmt easier • Small network: a single LAN • For example, CS dept at SJSU • Medium network: a few LANs • E.g., all departments in College of Science • Large network: geographically distributed • E.g., all CSU campuses Chapter 3  Network Implementation and Management Strategies 4

5. Network Design • “Typical” network • Network may be small, medium, large or super sized Chapter 3  Network Implementation and Management Strategies 5

6. Network Design Chapter 3  Network Implementation and Management Strategies 6

7. Network Design Chapter 3  Network Implementation and Management Strategies 7

8. Network Design Chapter 3  Network Implementation and Management Strategies 8

9. Network Mgmt Issues and Metrics Chapter 3  Network Implementation and Management Strategies 9

10. Network Mgmt Issues and Metrics Chapter 3  Network Implementation and Management Strategies 10

11. Network Mgmt Categories • ISO defined categories • Performance management • Fault management • Configuration management • Security management • Accounting management Chapter 3  Network Implementation and Management Strategies 11

12. Performance Mgmt • Concerned with • Response time • Utilization • Error rates, etc. • Must collect and analyze data • Number and type of packets • Might also rely on simulations Chapter 3  Network Implementation and Management Strategies 12

13. Perform. Mgmt Chapter 3  Network Implementation and Management Strategies 13

14. Fault Management • Preventions, detection and isolation of abnormal behavior • May be caused by malfunction, cable issue, the janitor, etc. • Traffic, trends, connectivity, etc. • SNMP polls • Alarms for automatic fault detection • Monitor statistics • Timeliness, etc. Chapter 3  Network Implementation and Management Strategies 14

15. Fault Mgmt Chapter 3  Network Implementation and Management Strategies 15

16. Configuration Mgmt • Device configuration • May be done locally or remotely • Network configuration • Sometimes called “capacity mgmt” • Critical to have sufficient capacity • Desirable to automate as much as possible • For example, DHCP and DNS • Extensions to SNMP MIB Chapter 3  Network Implementation and Management Strategies 16

17. Configuration Mgmt Chapter 3  Network Implementation and Management Strategies 17

18. Security Management • Control access to network/resources • Authentication: who goes there? • Authorization: are you allowed to do that? • Firewalls • Intrusion detection systems (IDS) • Notification of (attempted) breaches, etc. • Critical to always authenticate participants • SNMPv1 has very little security • SNMPv3 has lots of security built in Chapter 3  Network Implementation and Management Strategies 18

19. Security Mgmt Chapter 3  Network Implementation and Management Strategies 19

20. Accounting Management • Measure usage of network resources • Book does not cover accounting mgmt • Book does cover the other 4 categories • Accounting management is important Chapter 3  Network Implementation and Management Strategies 20

21. Accounting Management Chapter 3  Network Implementation and Management Strategies 21

22. Management Tools • Lots of tools listed in the book • List is included on next few slide • For this class, we want NMS that is • Free • Good enough for our purposes • Free, and most important of all… • …free • CD in book includes Meterware/Analyzer Chapter 3  Network Implementation and Management Strategies 22

23. Mgmt Tools Chapter 3  Network Implementation and Management Strategies 23

24. Mgmt Tools Chapter 3  Network Implementation and Management Strategies 24

25. Mgmt Tools Chapter 3  Network Implementation and Management Strategies 25

26. Other Free Systems • net-snmp • At http://sourceforge.net/projects/net-snmp • It’s free • Available for Windows, maybe OS X and Linux • openSNMP • At http://sourceforge.net/projects/opensnmp/ • It’s free • Available for Windows, maybe OS X and Linux Chapter 3  Network Implementation and Management Strategies 26

27. Network ManagementConfiguration • Centralized vs distributed • Centralized configuration • Illustrated here -----> Chapter 3  Network Implementation and Management Strategies 27

28. Network ManagementConfiguration • Centralized configuration • One mgmt station hosts NMS • Remote monitors/probes on LAN segments • Advantage: NMS has complete view • Disadvantage: single point of failure Chapter 3  Network Implementation and Management Strategies 28

29. Network ManagementConfiguration • Distributed configuration • Illustrated here -----> Chapter 3  Network Implementation and Management Strategies 29

30. Network ManagementConfiguration • Distributed configuration • Each LAN has its own management station and a simple NMS • One mgmt station/NMS manages the backbone and coordinates local NMSs • Advantage: robust in case of failure • Disadvantage: complexity, coordination Chapter 3  Network Implementation and Management Strategies 30

31. Textbook Mgmt Strategy • Many networks and mgmt strategies to choose from • Which to use for this class? • Keep it simple! • Centralized • One LAN, 2 subnets • SNMPv1 (Chapter 12 covers SNMPv3) Chapter 3  Network Implementation and Management Strategies 31

32. Selected Mgmt Strategy • Which MIB? • 4 choices: MIB I, MIB II, proprietary MIBs and RMON MIBs • Book uses MIB II • Which NMS? • Book uses Meterware/Analyzer • Book focuses on fundamental concepts… • …so other NMS would work too Chapter 3  Network Implementation and Management Strategies 32

33. MIB Objects and Instances • NMS • MIB object • Device agents • RMON agents • Instances Chapter 3  Network Implementation and Management Strategies 33

34. Chapter 3 Summary • Network implementation strategy • Network mgmt strategy • ISO network mgmt categories • Management tools • Centralized vs distributed configuration • Textbook network/mgmt strategy Chapter 3  Network Implementation and Management Strategies 34