A Brief Introduction to Internet Network Management. Geoff Huston
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1 A Brief Introduction to Internet Network Management Geoff Huston
2 What are we talking about? Network Management Tasks fault management configuration management performance management security management inventory management accounting management
3 Fault Management detection exception alarm generation investigation and analysis statistics for steady state behaviour characterisation
4 Configuration Management installation of new hardware/software tracking changes in control configuration who, what and why! revert/undo changes change management configuration audit does it do what was intended?
5 IP Route Management routing integrity consistency with customer requirements consistency with external peers conformance with imposed policyconstraints
6 Security Management exception alarm generation detection uniform access controls to resources backup
7 Performance Management Availability and Reliability metrics Quality metrics real-time measurement historical analysis
8 Accounting Management identifying consumers and suppliers of network resources mapping network resources to customer identity charge back volumetric data time data date time of day
9 Problem Tracking reporting procedures fault management escalation and referral historical data for component reliability analysis
10 Inventory Control hardware components identity location software version control
11 Knowledge Based Management "expert" systems Modelling simulation routing configuration changes
12 No single system will solve all your problems or meet all your requirements Any Network Management package can only complement effective and efficient operational procedures Need to identify what is important to you and your organisation
13 SNMP Simple Network Management Protocol Doesn't SNMP solve all these problems? Don't be silly!
14 SNMP Where did it come from? Internet Engineering Task Force» Network Management Area SNMP V1 MIB definitions SNMPV2*
15 What is it? more than just a protocol...
16 Structure of Management Information (SMI) identifies and defines structure of management information RFC1155 defines commonly defined data item syntax of the data type semantics of the data object
17 Syntax uses ASN.1 (Abstract Syntax Notation) binary encoding is a 1 byte integer, value 6 Primitive Types INTEGER, OCTECT STRING, OBJECT IDENTIFIER, NULL Constructor Types SEQUENCE <primitive-type>... SEQUENCE OF <primitive-type>... ie. a record ie. an array
18 Syntax Defined Data Types IpAddress Counter Gauge TimeTicks what you expect non-negative integer that wraps non-negative integer that latches time in hundredths of seconds
19 SNMP NAMES SNMP Name Structure 1 - iso 3 - org 6 - dod 1 - Internet 1 - directory 2 - mgmt 3 - expt 4 - private 1 - mib 1 - Enterprise 1 - system 2 - interfaces 9 - cisco 1 - sysdescr 2 - sysobjectid 1 - iftable 1 - ifentry 1 - ifindex 2 - ifdescr 3 - iftype ifinoctets
20 SNMP Management Information Base (MIB) "database"of network objects Groups:» System, Interfaces, Address Translation, IP, ICMP, TCP, UDP, EGP "Access" and "Status" attributes actual variables are "instances" of OIDs sysdescr ifinoctets for interface iproutenexthop for network
21 SNMP The SNMP protocol itself allows inspection and alteration of MIB variables UDP Based not acknowledged transactions PUT, GET, GET-NEXT operators
22 SNMP SNMP Traps unsolicited notification of events can include variable list ColdStart, WarmStart LinkUp, LinkDown Authentication Failure EGPNeighbourLoss Enterprise Specific
23 Network Management Software SNMP Agents provided by all router vendors many expanded (enterprise) MIBs bridges, wiring concentrators, toasters
24 Network Management Software Public Domain Application Programming Interfaces available from CMU and MIT include variety of applications
25 Network Management Software Commercially many offerings, UNIX and PC based» HP OpenView» SunNet Manager» ciscoworks» Cabletron Spectrum» *MANY* others
26 Does it: Choosing a Management Platform a) Support your systems? b) Run on your platforms? c) Meet your requirements? d) Match your resources?
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