Korenix -Industrial Ethernet Switch

When the scale of an industrial Ethernet application extends across multiple LANs and more networked devices, effective network management is a key issue for every network administrators. Automatic network management tools are required for standardized and real-time management.

SNMP
The Simple Network Management Protocol (SNMP) is an application layer protocol that provides a message format for communication between managers and agents. The SNMP system consists of an SNMP manager, an SNMP agent, and a management information base (MIB). The SNMP manager can be part of a network management system (NMS). The agent and MIB reside on the switch. To configure SNMP on the switch, you need to define the relationship between the manager and the agent.The SNMP agent contains MIB variables, whose values can be requested or changed by the SNMP manager. A manager can get a value from an agent or store a value into the agent. The agent gathers data from the MIB, the repository for information about device parameters and network data. The agent can also respond to a manager's requests to get or set data.An agent can send unsolicited traps to the manager. Traps are messages alerting the SNMP manager to a condition on the network. Traps can mean improper user authentication, restarts, link status (up or down), MAC address tracking, closing of a Transmission Control Protocol (TCP) connection, loss of connection to a neighbor, or other significant events.

RMON
Remote Monitoring (RMON) is a standard monitoring specification that enables various network monitors and console systems to exchange network-monitoring data. RMON provides network administrators with more freedom in selecting network-monitoring probes and consoles with features that meet their particular networking needs. The RMON specification defines a set of statistics and functions that can be exchanged between RMON-compliant console managers and network probes. As such, RMON provides network administrators with comprehensive network-fault diagnosis, planning, and performance-tuning information.

Figure 1 illustrates an RMON probe capable of monitoring an Ethernet segment and transmitting statistical information back to an RMON-compliant console.

RMON delivers information in nine RMON groups of monitoring elements, each providing specific sets of data to meet common network-monitoring requirements. Each group is optional so that vendors do not need to support all the groups within the Management Information Base (MIB). Some RMON groups require support of other RMON groups to function properly.1. Statistics: contains statistics measured by the probe for each monitored interface on this device.2. History: records periodic statistical samples from a network and stores them for later retrieval.3. Alarm: periodically takes statistical samples from variables in the probe and compares them with previously configured thresholds. If the monitored variable crosses a threshold, an event is generated.4. Host: contains statistics associated with each host discovered on the network.5. HostTopN: prepares tables that describe the hosts that top a list ordered by one of their base statistics over an interval specified by the management station. Thus, these statistics are rate-based.6. Matrix: stores statistics for conversations between sets of two addresses. As the device detects a new conversation, it creates a new entry in its table.7. Filters: enables packets to be matched by a filter equation. These matched packets form a data stream that might be captured or that might generate events.8. Packet Capture: enables packets to be captured after they flow through a channel.9. Events: controls the generation and notification of events from this device.