HP Network Direr Software Products manual Snmp Trap-Based Events, Information Severity

Key Concepts 321

SNMP Trap-Based Events

SNMP traps that are received by 3Com Network Director are processed and then used to generate SNMP trap-based events. SNMP trap-based events are indicated clearly in the Events window with their description being preceded by Trap:, or preceded by RMON alarm: if the SNMP trap was generated in response to an RMON alarm.

RMON (Remote network MONitoring) is a set of IETF standards that define SNMP MIBs that can be used for monitoring various aspects of a networks’ performance, such as throughput, conversations that have occurred on the network, response times and so on.

The standards define an alarm mechanism that allows a device to send SNMP traps when any of the attributes that it maintains statistics on reaches a certain state, in much the same way as a monitor generates an event when the monitor enters the warning or high states. For example, a device may be configured with an RMON alarm that is started when the packet rate through a particular port reaches a certain level.

For more information on SNMP traps, see “Controlling SNMP Trap

Filtering” on page 354.

3Com Network Director Internal Events

When you perform certain operations within 3Com Network Director, such as an Agent Upgrade or Backup, an event will be generated when the operation has completed. These events provide an audit trail of the operations that you have applied to your network.

In addition, events are generated when you open, close and create new maps. These are generated so that you can easily identify whether a period during which no events were logged is due to the network being in a stable state or due to 3Com Network Director not being active.

Event Severities Each logged event has a severity associated with it that is used to indicate the perceived impact of the event on your network. There are five event severities, in order of increasing severity these are: info, warning, high, critical and recurring.

Information Severity

The information, or info, severity is used for any event that does not, as far as 3Com Network Director can determine, have any negative impact upon your network. This includes such occurrences as maps being