TTM4128: Network and Service Management
"So this concludes the presentation B.. 2.. 3." - Finn Arve Aagesen
Network Management Introduction
The term "network management" is defined as Operations, Administration, Maintenance and Provisions (OAMP) of networks and services. Its main objective is to allow managers to meet the QoS requirements with an optimal cost, facing challenges including:
- Appropriate specification of the system requirements (ex: functionality, dependability, performance, cost)
- Appropriate selection of technology
- The handling of technology heteroginity
- The handling of technology development
- The daily handling of FCAPS
FCAPS
FCAPS, coined by ISO, presents some of the major challenges faced by the network manager:
- Fault management: Managing the occurrence of faulty events, such as disconnections at virtual connections, links and interfaces.
- Configuration management: Setting and tuning various network devices.
- Accounting management: Charging and billing the use of resources in an enterprise.
- Performance management: Measurements of performance metrics and actions.
- Security management: Prevent unauthorized access, attacks, and protecting data.
These challenges can be met by
- Appropriate system architectures
- Scalability, redundancy, flexibility, open solutions for primary as well as management functionality
- Appropriate dimensioning of resources (servers, nodes, network links)
- Appropriate management tools (Monitoring, troubleshooting and configuration tools and systems)
- Appropriate organization of human resources and technical tools
- External and internal service procedures
- Human organization of management tasks
- Appropriate economical resources
SNMP - Simple Network Management Protocol
SMI - Structure of Management Information
Defines SNMP specific ASN.1 syntax and semantics, nodes in the Internet Management tree, the OBJECT-TYPE Macro and mechanism to define Indexes.
MIB Group
A collection of related MIBs that are implemented as a whole in a managed system.
SNMP Versions
Comparisons
Security
SNMP version 1 and 2 is prone to the following security threats:
- Modification of Information
- Masquerade
- Reordering of message fragments (to modify meaning)
- Disclosure
This is resolved in SNMPv3 by implementing the following security services:
- Data integrity
- Data origin authentication
- Encryption
- Prevention of redirection, delay and replay
Semantic Web
RDF - Resource Description Framework
RDF is a framework for describing resources on the web. It is designed to be read and understood by computers, and written in XML. RDF is a W3C recommendation.
Example RDF document:
<?xml version="1.0"?>
<RDF>
<Description about="http://www.w4schools.com/rdf">
<author>Kris. K. Larsen</author>
<homepage>http://www.w4schools.com</homepage>
</Description>
</RDF>
CIM - Common Information Model
Consists of three main components:
- CIM Specification
- CIM Schema
- CIM Extension Schema
CIM Specification
Defines details for integration with other models, as well as syntax and rules and the CIM metaschema.
CIM Schema
Defines the actual model descriptions for systems, applications, local area networks (LANs) and devices. It consists of the Core Model and the Common Models.