Network Management Computer Networks Autumn 2000 John Kristoff

Network Management Computer Networks Autumn 2000 John Kristoff 1

OSI Network Management Model Ñ Performance Management Ñ e. g. utilization Ñ Fault Management Ñ e. g. SNMP traps Ñ Configuration Management Ñ e. g. configuration files Ñ Accounting Management Ñ e. g. chargeback systems Ñ Security Management Ñ e. g. access control Autumn 2000 John Kristoff 2

Components of a Network Management System Ñ Manager Ñ centralized Ñ collects, controls, and reports Ñ Managed entities Ñ agent software Ñ management information base (MIB) Ñ Network management protocol Autumn 2000 John Kristoff 3

Simple Network Management Protocol Ñ Most popular version is SNMPv 1 Ñ SNMPv 2 exists, but no one uses it Ñ SNMPv 3 enhances admin and security Ñ SNMPv 1 defined in RFC 1157 Ñ Two popular books Ñ The Simple Book - M. Rose Ñ SNMP, SNMPv 2, SNMPv 3 and RMON 1 and 2 - W. Stallings Autumn 2000 John Kristoff 4

Structure of Management Information (SMI) Ñ Based on ASN. 1 Ñ Defines information in managed entity Ñ Integer 32, Unsigned 32 Ñ IPaddress Ñ Counter 32, Counter 64 Ñ High level constructs Autumn 2000 John Kristoff 5

SMI Example Ñ ip. In. Delivers Object. Type Ñ SYNTAX Counter 32 Ñ MAX-ACCESS read-only Ñ STATUS current Ñ DESCRIPTION Ñ"The total number of input datagrams successfully delivered to IP user-protocols (including ICMP). � Ñ : : = ( ip 9 ) Autumn 2000 John Kristoff 6

Management Information Base (MIB) Ñ Stores information of managed entity Ñ Values can be queried and often set using the network management protocol (SNMP) Ñ Many standard MIBs and many more private MIBs Ñ Objects arranged in MIB according to its Object ID (OID) Autumn 2000 John Kristoff 7

MIB Naming Format Ñ Uses ISO format Ñ Example Ñ Cisco� s MIB: Ñ 1. 3. 6. 1. 4. 1. 9 Ñ A Cisco MIB object: Ñ 1. 3. 6. 1. 4. 1. 9. 9. 13. 1. 3 Ñ device temperature Autumn 2000 John Kristoff 8

SNMP Protocol Operation Ñ Get. Request Ñ Get. Next. Request Ñ Set. Request Ñ Get. Response Ñ Trap Ñ SNMPv 2 adds functionality Ñ e. g. Get. Bulk. Request Autumn 2000 John Kristoff 9

SNMP Message Format Autumn 2000 John Kristoff 10

Remote Network Monitoring (RMON) Ñ RMON is a MIB for remote management of a network as opposed to a single managed entity Ñ Probes collect and process information Ñ Standard RMON groups Ñ statistics, history, alarm, host. Top. N, matrix, filter, packet capture, event Autumn 2000 John Kristoff 11

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. Autumn 2000 John Kristoff 12