Connectivity Guide

SNMP Traps
SNMP is frequently used to monitor systems for fault conditions such as temperature violations, hard drive failures. Management
applications can monitor for these conditions by polling the appropriate OIDs with the Get command and analyzing the returned data. This
method has its drawbacks. If it is done frequently, signicant amounts of network bandwidth can be consumed. If it is done infrequently,
the response to the fault condition may not occur in a timely fashion. SNMP traps avoid these limitations of the polling method.
An SNMP trap is an asynchronous event indicating that something signicant has occurred. This is analogous to a pager receiving an
important message, except that the SNMP trap frequently contains all the information needed to diagnose a fault.
Two drawbacks to SNMP traps are that they are sent using UDP, which is not a guaranteed delivery mechanism, and that they are not
acknowledged by the receiver.
An SNMP trap message contains the trap’s enterprise OID, the agent IP address, a generic trap ID, the specic trap ID, a time stamp, and
zero or more variable bindings (varbinds). The combination of an enterprise OID and a specic trap ID uniquely identies each Server
Administrator-dened trap. A varbind consists of an OID and its value and provides additional information about the trap.
In order for a management system to receive SNMP traps from a managed system, the node must be congured to send traps to the
management system. Trap destination conguration depends on the operating system. When this conguration is done, a management
application on the management system can wait for traps and act on them when received.
NOTE
: For information on Server Administrator Storage Management traps, see in Storage Management Alert Reference, the
Alert Descriptions and Corrective Actions.
NOTE: For the list of storage management alerts and storage management messages, see the Dell OpenManage Server
Administrator Messages Reference Guide available on the Dell Support site at dell.com/openmanagemanuals navigate to
OpenManage Software and select the version required.
Topics:
• Trap Variables
• Understanding The Trap Description
• Understanding Trap Severity
• BMC Traps
Trap Variables
This section describes the variables both on Traditional and Enhanced varbinds that are sent to the management console to provide
additional information about a trap or alert generated by some event on your system. The trap variables presented here apply to all
Instrumentation and RAC traps. Trap variables are sent in the order listed and are reserved for use only in traps. When a varbind is created
for a trap variable, a zero is appended to the object ID (OID) to create the OID for the varbind.
The messages associated with each alertMessage varbind are available in the Message Reference Guide and can be found by matching the
alert ID in the MIB to the event ID in the Message Reference Guide.
Table 1837. Trap Variables
Variable Name
alertSystem
Object ID 1.3.6.1.4.1.674.10892.1.5000.10.1
5
SNMP Traps 461