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Network Management

Network Management

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Network Management

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  1. Network Management Computer Networks

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

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

  6. SMI Example • ipInDelivers ObjectType • SYNTAX Counter32 • MAX-ACCESS read-only • STATUS current • DESCRIPTION • "The total number of input datagrams successfully delivered to IP user-protocols (including ICMP).” • :: = ( ip 9 )

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

  10. SNMP Message Format

  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. 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.