Troubleshooting Solaris™; Network Performance
Alex Golomshtok
http://www.samag.com/documents/s=7667/sam0213a/0213a.htm
Networks are the bloodstreams of modern computer systems. Today, nearly all computers are connected to some kind of public or private network, and it is difficult to imagine a system without at least some sort of networking capabilities. As computer technology continues to evolve, the distributed computing model gains more ground, thus increasing the importance of networks. In fact, today most organizations rely on their own complex networking structures so much that even a short period of downtime may easily translate into millions of dollars of lost revenues.
Modern-day networks are often monstrously complex, convoluted, and rely on a wide spectrum of technologies. A typical corporate network, for instance, may bring together thousands of computer systems from different hardware vendors, running various operating systems. Monitoring the health of such network is quite a challenge and may be impossible without the proper tools. To satisfy growing demands for reliable management of heterogeneous networks, the Simple Network Management Protocol (SNMP) was developed and adopted as a management standard for TCP/IP-based networking systems. SNMP quickly gained popularity and remains the primary mechanism for carrying out a multitude of network management tasks, such as network performance monitoring, fault management, configuration management, and more.
SNMP
The foundation of SNMP is the database containing the management data, on which the network management system operates. This database is commonly referred to as the Management Information Base (MIB). SNMP MIB is essentially a tree-like collection of objects, each representing a managed resource on a network. A network management system can monitor the state of these objects by reading their properties and alter the state by modifying these properties. The organization of an MIB is governed by a standard, called Structure of Management Information (SMI) [1] — it outlines the rules for constructing and defining MIB management objects. Over the years, a few different MIBs have been developed to address various aspects of network and system management, such as Relational Database Monitoring MIB and Mail Management MIB. MIB-II [2], which defines the second version of the management information base for TCP/IP-based Internets, however, remains perhaps the most important and the most commonly used MIB specification. MIB-II defines following broad groups of management information:
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