1. National Chi Nan University Study of Network Performance Measurement Based on SNMP The 8 th International Conference on Computer Supported Cooperative Work in Design Proceedings Author: Shufen Liu, Lu Han, Xinjia Zhang, Kai Nie

2. National Chi Nan University Outline Introduction Usability Response Time Precision Utilization Conclusion 2

3. National Chi Nan University Introduction Performance measurement is the base of network management Modern computer network is an integrated system – Devices – Links – Application services 3

4. National Chi Nan University Introduction Cont. Devices – Network device – Host device Link – Throughput – Usability – Utilization Application service – Response time 4

5. National Chi Nan University Usability The time of computer network system and application services could be used by user – Ex: A network runs 165 hours among 168 hours one week, the usability will be 98.21% Related redundancy – Multiple links or backup devices – SCTP Related reliability – Error rate 5

6. National Chi Nan University Theoretical Model of Usability 6

7. National Chi Nan University Realization Method of Usability Active detection – ICMP ping – SNMP poll Passive receiving notification – SNMP trap Passive is better than active – Unusable during two active requests 7

8. National Chi Nan University Response Time Network response time – Network congestion – Error occurs (Collision) Application service response time – Unnecessary for network performance measurement – Necessary for application performance measurement 8

9. National Chi Nan University Precision 9

10. National Chi Nan University Utilization The percentage of used capacity to usable capacity – Interface utilization – CPU utilization – Memory utilization 10

11. National Chi Nan University Interface Utilization 11 IF: Interface

12. National Chi Nan University CPU & Memory Utilization 12

13. National Chi Nan University Conclusion This paper introduces the important position of network measurement method in network management Briefly introduces the elements which affect network performance 13