SNMP is frequently used to monitor systems for fault
conditions such as temperature violations, hard drive failures, and
so on. 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,
significant 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 significant 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 specific trap ID,
a time stamp, and zero or more variable bindings (varbinds). The combination
of an enterprise OID and a specific trap ID uniquely identifies each
Server Administrator-defined 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 configured to send traps to
the management system. Trap destination configuration is dependent
on the operating system. When this configuration 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
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.
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