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A List of Built-In Triggers

The table below lists all the built-in triggers that NerveCenter can fire.

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

Built-In Triggers

Trigger Name	Meaning
CANNOT_SEND	A local error occurred while NerveCenter was trying to send an SNMP message.
ERROR	An SNMP or ICMP request did not result in a valid response. After firing the ERROR trigger, NerveCenter fires a second trigger that indicates the specific nature of the error.
ICMP_ERROR	Indicates an ICMP error. The ICMP_ERROR trigger contains the ICMP/IP fields from the error message.
ICMP_TIMEOUT	NerveCenter sent an ICMP ping to a node and did not receive a response. This trigger generally indicates that the node in question is down. NerveCenter uses the number of retries and retry interval specified on the SNMP tab in the Administrator. Refer to the Managing NerveCenter guide for details.
ICMP_UNKNOWN_ERROR	NerveCenter sent an ICMP ping to a node and received an invalid response. This trigger is no longer used except for the purpose of backward compatibility with version 3.5. We recommend you use it sparingly in the current version.
INFORM_CONNECTION_DOWN	A NerveCenter Inform host connection with OVPA is down.
INFORM_CONNECTION_UP	A NerveCenter Inform host connection with OVPA was down but is now back up.
INFORMS_LOST	The number of NerveCenter Informs that were unacknowledged and lost, usually while the inform host connection with OVPA was down.
NET_UNREACHABLE	Indicates that the IP routing layer could not find a route to the network containing the polled node, usually because at least one router was down. This trigger indicates nothing about the status of the node. This trigger can be issued only if you have a router between the workstation running NerveCenter and the polled node.
NODE_UNREACHABLE	Indicates that the IP routing layer could not find a route to the destination node. This trigger indicates nothing about the status of the node. This trigger can be issued only if you have a router between the workstation running NerveCenter and the polled node.
PORT_UNREACHABLE	NerveCenter sent a message to a node, and there was no response from the port to which the message was sent.
RESPONSE	NerveCenter sent an SNMP message and received a valid response from the agent on the destination node.
SNMP_AUTHORIZATIONERR	An SNMP v3 authorization error caused because there is a mismatch between one or all of the rows of vacmAccessTable and the packet. Reasons include: context name mismatch (vacmAccessContextPrefix); security model is not used (vacmAccessSecurityModel); incorrect security level (vacmAccessSecurityLevel); unauthorized to read the MIB view for the SNMP context (vacmAccessReadViewName); unauthorized to write to the MIB view for the SNMP context (vacmAccessWriteViewName); unauthorized to notify the MIB view for the SNMP context (vacmAccessNotifyViewName)
SNMP_BADVALUE	NerveCenter tried to set the value of an attribute in a MIB, but the value it supplied was inappropriate for the attribute. The value may have been of the wrong type, of the wrong length, or invalid for some other reason.
SNMP_DECRYPTION_ERROR	The SNMP v3 engine dropped packets because they could not be decrypted. The 32-bit counter, usmStatsDecryptionErrors, is greater than zero.
SNMP_ENDOFTABLE	NerveCenter fires SNMP_ENDOFTABLE when it finds no more rows while performing an SNMP walk of a MIB table. For example, you could walk IfTable to determine the number of DSO interfaces a node contains.
SNMP_GENERR	A GetRequest, GetNextRequest, or SetRequest failed for some unknown reason (general error).
SNMP_NOSUCHNAME	NerveCenter sent to an SNMP agent a GetRequest, a GetNextRequest, or a SetRequest, and the agent that was contacted was unable to perform the requested operation because: The name of the attribute to be read did not match exactly the name of an attribute available for get operations in the relevant MIB view The name of the attribute to be read did not lexicographically precede the name of an attribute available for get operations in the relevant MIB view The attribute to be set was not available for set operations in the relevant MIB view
SNMP_NOT_IN_TIME_WINDOW	The SNMP v3 engine dropped packets because the boots and timeticks sent in the PDU appeared outside of the authoritative SNMP agent's time window. The 32-bit counter, usmStatsNotInTimeWindows, is greater than zero.
SNMP_READONLY	The error readOnly is not defined in RFC 1157. However, some vendors' agents do use this error-status code. As the name implies, the error usually indicates that an agent has received a SetRequest (from NerveCenter, in this case) for an attribute whose access type is read only.
SNMP_TIMEOUT	NerveCenter sent an SNMP message to an agent and did not receive a response. This trigger indicates either that a node's SNMP agent is down or that the node itself is down. NerveCenter uses the number of retries and retry interval specified on the SNMP tab in the Administrator. Refer to the Managing NerveCenter guide for details.
SNMP_TOOBIG	An SNMP agent did not respond normally to a GetRequest, GetNextRequest, or SetRequest from NerveCenter because the size of the required GetResponse would have exceeded a local limitation.
SNMP_UNAVAILABLE_CONTEXT	The SNMP v3 engine dropped packets because the context contained in the message was unavailable. The 32-bit counter, snmpUnavailableContexts, is greater than zero.
SNMP_UNKNOWN_CONTEXT	The SNMP v3 engine dropped packets because the context contained in the message was unknown. The 32-bit counter, snmpUnknownContexts, is greater than zero.
SNMP_UNKNOWN_ENGINEID	The SNMP v3 engine dropped packets because they referenced an snmpEngineID that was not known to the SNMP v3 engine. The 32-bit counter, usmStatsUnknownEngineIDs, is greater than zero.
SNMP_UNKNOWN_USERNAME	The SNMP v3 engine dropped packets because they referenced a user that was not known to the SNMP v3 engine. The 32-bit counter, usmStatsUnknownUserNames, is greater than zero.
SNMP_UNSUPPORTED_SEC_LEVEL	The SNMP v3 engine dropped packets because the requested security level is unknown or unavailable. The 32-bit counter, usmStatsUnsupportedSecLevels, is greater than zero.
SNMP_WRONG_DIGEST	The SNMP v3 engine dropped packets because they didn't contain the expected digest value. The 32-bit counter, usmStatsWrongDigests, is greater than zero.
UNKNOWN_ERROR	Some other error occurred.

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One additional trigger, USER_RESET, is not available from the list of built-in triggers in NerveCenter. NerveCenter fires USER_RESET to trigger another state for an existing alarm instance when you reset the alarm instance using the right-click pop-up menu in the Alarm Summary or Aggregate Alarm Summary windows.