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Network Management

Network Management

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Network Management

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  1. Network Management Computer Networks John Kristoff

  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 John Kristoff

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

  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 John Kristoff

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

  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 ) John Kristoff

  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) John Kristoff

  8. 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 MIB Naming Format John Kristoff

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

  10. SNMP Message Format John Kristoff

  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 John Kristoff

  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. John Kristoff