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Overview of Network Management. Outline Describe responsibilities of a network manager Define network management vocabulary Discuss network management.

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Presentation on theme: "Overview of Network Management. Outline Describe responsibilities of a network manager Define network management vocabulary Discuss network management."— Presentation transcript:

1 Overview of Network Management

2 Outline Describe responsibilities of a network manager Define network management vocabulary Discuss network management principles Provide an example of network management implementation Identify new network management approaches The evolution of network management

3 Common Network Problems Loss of connectivity (Link, Node, Interface) Duplicate IP address (Procedural) Intermittent ( 間歇的 ) problems Network configuration issues Performance problems

4 Network Management (NM) Goal  To ensure that network users receive IT services with the quality of service (QoS) that they expect Maintenance  Network performance  Failures (hardware and software)  Network capacity  Security Certifications  CAN (Novell ’ s Certified Netware Administrator)  MCP (Microsoft ’ s Certified Professional)  CNE (Novell ’ s Certified Netware Engineer)  MCSE (Microsoft Certified System Engineer)

5 Top-down View of NM functions

6 Network-Based Management SNMP: Simple Network Management Protocol (RFC1157) MIBs: Management Information Base NMS: Network management system RMON1: Remote Monitor (RMON1) RFCs: Request for Comments IETF: Internet Engineering Task Force

7 Network Management Vocabulary Network Management System (NMS)  Consisting of applications Management Station  Managing device - management software (NMS) Management Agent  Managed device – computer, hub, router, or switch Management Agent Management Station NMS

8 Network Management Vocabulary (cont.) Mgmt (Management) process  Service management application programs  Provide an interface to the network management protocol, e.g, SNMP Agent process  An integrator of processes that access information requested by a network management application  An interface to the network management protocol  Collect the values of a specified set of variables when a request is made by the Management Station  The virtual store of such values is called the Management Information Base (MIB), actually maintained by the managed device Transport Presentation Data Link Session Network Physical Agent Process Agent Protocol Management Agent Figure 2-2: Protocol Stacks on the Management Station and the Management Agent Presentation Transport Data Link Session Network Physical Mgmt Process Mgmt Protocol Management Station Mgmt App

9 A Network Management Example The management application calls for the service of the management process The management process calls the program that implements the network management protocol, e.g., SNMP The network management protocol implementation constructs a request packet, which is sent to the management agent The implementation of the network management protocol on the management agent causes the request packet to be passed to the agent process The agent process accesses the value of the requested variable and passes it to the implementation of the network management protocol The network management protocol constructs the response packet, which is sent to the management station The implementation of the network management protocol at the management station receives the response packet and passes it to the management process The management process either passes the value to the application program, or stores it in memory for later retrieval

10 Network Management Vocabulary (cont.) Trap  The management agent send unsolicited messages to the management station  E.g., a device goes from powered-up to the powered- down state Probe (remote monitors, RMON)  Monitor traffic on the network segment, not a particular device  The management agent thus is remote from the devices it is monitoring

11 Evolution of Network Management DATEEVENTREFERENCE 1968 ARPA funds development of packet switching networks 1. RFC 1120 Internet Activities Board. V. Cerf. Sep-01-1989. (Obsoleted by RFC 1160) 2. RFC 1160 Internet Activities Board. V. Cerf. May-01-1990. (Obsoletes RFC 1120) 1974TCP/IP concept proposedCerf V., and R. Kahn, "A Protocol for Packet Network Interconnection", IEEE Trans. on Communications, Vol. COM-22, No. 5, pp. 637-648, May 1974. [Ref 26] 1976Ethernet DevelopedMetcalfe, R., and D. Boggs, "Ethernet: Distributed Packet for Local Computer Networks", Communications of the ACM, Vol. 19, No. 7, pp. 395-404, July 1976. 1978OSI Reference Model Development Initiated 1983OSI Reference Model becomes international standardISO/IEC 7498 (CCITT X.200) [Ref 1] 1987SGMP development started ASN.1 developed [Ref 24] ISO 8824, Parts 1-4

12 Evolution of Network Management (cont.) 1988IAB initiates study of SGMP and CMIP SNMPv1 becomes Interim Draft Standard SNMPv1 becomes Draft Standard IAB initiates development of Internet Standard Network Management Framework (SMI) Draft Standard MIB I developed Interim RFC 1028 (SNMPv1) Draft RFC 1098 (SNMPv1) Draft RFC 1065 (SMI) Draft RFC 1066 (MIB I) [Ref 10] 1989CMOT approach abandoned SNMP becomes the defacto standard for TCP/IP management 1990SMI becomes Recommended Standard SNMPv1 becomes Recommended Standard MIB I becomes Recommended Standard RFC 1155 (SMI) RFC 1157 (SNMP) [Ref 3] RFC 1156 (MIB I) [Ref 11] 1991MIB II RMON1 RFC 1213 (MIB II) RFC 1271 (RMON I) [Ref 12]

13 Evolution of Network Management (cont.) 1993SNMPv2 Proposed SNMPv2 Security SNMPv2 MIB SNMPv2 SMI RFC 1441(SNMPv2 Management Framework RFC 1446(SNMPv2 Security Protocols RFC 1450 (SNMPv2 MIB) RFC 1442 SNMPv2 Structure of Management Information 1995RMON IRFC 1757 [Ref 13] 1997RMON IIRFC2021 1998Desktop Management Interface (DMI) Specification v 2.0s Web-based Management Initiative 1. http://w ww.dmtf.org/sped/dmis 2. Network Computing, Feb 2001, p57 http://www.dmtf.org/standards/standard_w bem.php 1999SNMPv2 Management Frameworks SNMPv3 Security RFC 2571 RFC 2574 (User-based Security Model) 2002SNMP Management Frameworks SNMPv3 Security SNMP VACM SNMP MIB RFC 3411, STD 62 RFC 3414 (User-based Security Model), STD 62 RFC 3415 (View-based Access Control Model), STD 62 RFC 3418, STD 62

14 1964 1968 1972 1976 1980 1984 1988 1992 1996 2000 2004 Packet Switching (ARPA) TCP/IP Ethernet OSI Reference Model Development SGMP SGMP & CMIP SNMPv1 SMIMIB1 MIB 2 RMON 1 SNMPv2SNMPv2 MIB RMON 2 SNMPv3 DMI Web Based Mgmt CMOT Evolution of Network Management Technologies

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