1. 1 Network Management Computer Networks

2. 2 OSI Network Management Model Performance Management e.g. utilization Fault Management e.g. SNMP traps Configuration Management e.g. configuration files Accounting Management e.g. chargeback systems Security Management e.g. access control

3. 3 Components of a Network Management System Manager centralized collects, controls, and reports Managed entities agent software management information base (MIB) Network management protocol

4. 4 Simple Network Management Protocol Most popular version is SNMPv1 SNMPv2 exists, but no one uses it SNMPv3 enhances admin and security SNMPv1 defined in RFC 1157 Two popular books The Simple Book - M. Rose SNMP, SNMPv2, SNMPv3 and RMON 1 and 2 - W. Stallings

5. 5 Structure of Management Information (SMI) Based on ASN.1 Defines information in managed entity Integer32, Unsigned32 IPaddress Counter32, Counter64 High level constructs

6. 6 SMI Example ipInDeliversObjectType SYNTAXCounter32 MAX-ACCESSread-only STATUScurrent DESCRIPTION "T he total number of input datagrams successfully delivered to IP user-protocols (including ICMP).” :: = ( ip 9 )

7. 7 Management Information Base (MIB) Stores information of managed entity Values can be queried and often set using the network management protocol (SNMP) Many standard MIBs and many more private MIBs Objects arranged in MIB according to its Object ID (OID)

8. 8 MIB Naming Format Uses ISO format Example Cisco ’ s MIB: 1.3.6.1.4.1.9 A Cisco MIB object: 1.3.6.1.4.1.9.9.13.1.3.1. 3 device temperature

9. 9 SNMP Protocol Operation GetRequest GetNextRequest SetRequest GetResponse Trap SNMPv2 adds functionality e.g. GetBulkRequest

10. 10 SNMP Message Format

11. 11 Remote Network Monitoring (RMON) RMON is a MIB for remote management of a network as opposed to a single managed entity Probes collect and process information Standard RMON groups statistics, history, alarm, host, hostTopN, matrix, filter, packet capture, event

12. 12 John’s Theory on Network Management If you spend more time managing your network management system(s) than your actual production network, you ’ re doing something very wrong.