Designing and Managing Behavior Models - Using Other Data Sources - NerveCenter's Built-In Triggers -
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NerveCenter's Built-In Triggers

When NerveCenter requests a poll, the SNMP GetRequest or the ping that the poll initiates is placed on either NerveCenter's pending SNMP requests list or pending ICMP requests list. NerveCenter waits for a reply from the node or the node's SNMP agent (or from an intervening router). If the node or its SNMP agent sends a non-error reply, then NerveCenter evaluates the poll condition and fires the appropriate trigger.

However, if the node or its SNMP agent makes no response or returns an error -- depending upon the circumstances -- NerveCenter will either retry the request or fire one of its built-in triggers. Those conditions that cause NerveCenter to fire its built-in triggers can be broken down into the following categories:

• SNMP Requests
• Ping Requests
• Matching Errors with Pending SNMP and Ping Requests
• Multi-homed Nodes

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  Note    NerveCenter uses all uppercase letters to designate built-in trigger names.

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For particular information about NerveCenter's built-in triggers, see A List of Built-In Triggers.

For information about the order in which NerveCenter fires built-in triggers, see Built-in Trigger Firing Sequence.