網路管理基本觀念

1. 網路管理基本觀念 陳彥錚 (Yen-Cheng Chen) ycchen@ncnu.edu.tw http://www.im.ncnu.edu.tw/~ycchen/

2. 內容大綱 • 1. 網路管理簡介 • 2. 網路管理模型 • 3. 網路管理五大功能領域 • 障礙管理 (FM) • 組態管理 (CM) • 安全管理 (SM) • 效能管理 (PM) • 計量管理 (AM)

3. 1. 網路管理簡介 • 網路管理之定義 • 整合性網路管理之層面 • 管理金字塔 • 管理範圍 • 網路管理基本方式

4. 網路管理之定義 • Network Management is the process of controlling a complex (data) network to maximize its efficiency and productivity. • OAM&P • Operation, Administration, Maintenance, & Provisioning • M&C • Monitoring & Control

5. Provider Structure (Processes, Services, Policies) 企業管理 (Enterprise Management) ... Application Application 應用管理 (Application Management) Application ... 資訊管理 (Information Management) Data Data 網路與系統資源 系統管理 (System Management) 網路管理 (Network Management) UNIX 整 合 性 管 理 之 層 面 通訊網路 Hubs, Bridges, Routers, ... Multiplexers,Switches, ...

6. 管理金字塔 (Management Pyramid) Business Management Customer Management Service Management Distributed System Management Network Management Element Management

7. Configuration Performance IN VPN Accounting Corporate Network Change Fault WAN Operation MAN Accounting LAN Installation Planning Network Management Data System Management Voice Applications Management Video Service Management Multimedia Eneterprise Management Functional Areas Network Types Stages 管理範圍 ? Disciplines Information Types

8. FDDI .... .... .... PC PC PC UNIX UNIX UNIX 網路管理基本方式 network 網管系統 NM ... Notification RMON Device RMON Device Polling Firewall / Router ... Internet

9. 網路管理基本方式 (續) • Polling (輪詢) • 網管系統主動至被管設備要求網管相關資訊 。 • 一般採用週期性輪詢，週期長短視需要而定，一般設為5~15分鐘。 • Notification (通報) • 網路設備自行發現問題時，主動向網管系統發出事件報告(Event Report)。

10. 2. 網路管理模型 Management Station Network Element Management Operation R MA MO Response Event Manager Agent Communication Protocols Communication Protocols Network Legend： MA: Manager Applications MO: Managed Objects R: Real Resource

11. 網路管理構成元素 • 管理者 (Manager) • 代理者 (Agent) • 網路管理通信協定 (Network Management Protocol) • 網路管理資訊 (Network Management Information)

12. 網路管理角色 • 管理者 (Manager) • 執行各項用來監督(Monitor)及控制(Control)網路設備的網管應用程式 • 代理者 (Agent) • 位於網路設備端，負責接受從管理者端送來之要求，執行所付予之工作，並將結果回報給管理者。

13. 網路管理協定 • 網路管理協定專為管理者與代理者所設計之通信協定。 • 網路管理協定提供管理者與代理者間交換網管資訊標準方式。 • 目前主要兩種網管通信協定 • Internet網管通信協定： • SNMP (Simple Network Management) • OSI網管通信協定： • CMIS/P (Common Management Information Service / Protocol)

14. 網路管理資訊 • 被管物件(Managed Object, MO) • 將待管之網路資源，抽象化為物件，稱被管物件，簡寫MO。 • 被管物件所代表之網路資源可大可小，大可至代表整個網路設備如ATM交換器，小可至代表某一網路元件之參數，如介面卡之狀態。 • 管理資訊庫 (Management Information Base) • 被管物件之集合，簡寫MIB。

15. 3. 網管五大管理功能領域 • 管理功能領域 (Management Functional Areas, MFAs) • 障礙管理 (Fault Management) • 組態管理 (Configuration Management) • 安全管理 (Security Management) • 效能管理 (Performance Management) • 計量管理 (Accounting Management)

16. 障礙管理 (Fault Management) • Fault Management (FM) • Detection of a problem, fault isolation and correction to normal operation. • FM involves the following steps: • Discover the problem. • Isolate the problem • Fix the problem (if possible)

17. 障礙管理之功能 • Maintain and examine error logs • Accept and act upon error detection notifications • Trace and identify faults • Carry out sequences of diagnostic tests • Correct faults

18. FDDI .... .... .... PC PC PC UNIX UNIX UNIX 障礙管理實例 User DNS ... RMON Device Firewall / Router ... Internet WWW Server Mail Server

19. FM例子：障礙存錄

20. 組態管理 (Configuration Management) • Configuration Management (CM) • The process of finding and setting up (configuring) network devices. • CM identifies, exercises control over, collects data from, and provides data to networked systems.

21. 組態管理之功能 • Set the parameters that control the routine operation of the networked system. • Associate names with managed objects and sets of managed objects. • Initialize and close down managed objects. • Collect information on demand about the current condition of the networked system. • Obtain announcements of significant changes in the condition of the networked system. • Change the configuration of the networked system.

22. CM 例子: Auto Discovery

23. CM 實例: 中華電信(CHTNet)

24. 安全管理 (Security Management) • Security Management (SM) • The process of controlling access to information on the networked system. • 安全管理之功能 • The creation, deletion, and control of security services and mechanisms. • The distribution of security-relevant information. • The reporting of security-relevant events.

25. 效能管理 (Performance Management) • Performance Management (PM) • Measuring the performance of network hardware, software, and media. • 幾個量測例子： • Overall throughput • Percentage utilization • Error rate • Response time

26. 效能管理之功能 • Gather statistical information. • Maintain and examine logs of system state histories. • Determine system performance under natural and artificial conditions. • Alter system modes of operation for the purpose of conducting PM activities.

27. PM例子|網路訊務量監測

28. 計量管理 (Accounting Management) • Accounting Management (AM) • Tracking each individual and group user's utilization of network resources to better ensure that users have sufficient resources. • AM enables charges to be established for the use of network resources, and the costs to be identified for the use of those network resources.

29. 計量管理之功能 • Inform users of costs incurred or resources consumed. • Enable accounting limits to be set and tariff schedules to be associated with the use of resources. • Enable costs to be combined where multiple resources are invoked to achieve a given communication objective.