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Setting Up Fault Management Alarm Propagation
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AlliedView NMS Administration Guide
9.8 Alarm Propagation
9.8.1 Overview
In a network, components (managed objects) are in a hierarchy, and faults at one level usually affect the status of another
level. Network administrators need to understand how the AlliedView NMS reports and propagates alarms so that they can
control what alarms appear in the Alarm View and quickly locate and resolve them.
Refer to Figure 9-19 while reading this section, since it helps show the types of methods used to obtain the status of an
object and the objects relationship to the network hierarchy.
FIGURE 9-19 Alarm Propagation Hierarchy
There are various methods used to get the status of a managed object:
• PING - This uses ICMP for polling, and so uses a simple traceroute to see of the object responds. If there is no response,
an alarm (usually MAJOR) is produced.
• SNMPPING - This uses an SNMP GET for polling, and waits for a response. If there is no response, an alarm (usually
MAJOR) is produced. Moreover, if there is no response within 5 seconds, there is an additional time out alarm.
• Traps - These are the unsolicited messages that are sent by the device, with a resulting alarm.
• MAX - This is not an actual method (there is no direct communication with the object), but a rolling up of the status
results of an object and its children objects and a reporting of the alarm of the highest severity. The examples below will
explain this in greater detail and show how this works.
The main concepts for alarm propagation up the hierarchy are as follows:
• The status of an object is the highest severity alarm for that object.
• When alarms are propagated, the highest alarm of all children is what gets propagated (if parent set to MAX).
• The severity of an alarm on the parent object (node) is the highest severity for that node, including the severities that are
propagated (if parent set to MAX).
9.8.2 Controlling Alarm Propagation
While referring to Figure 9-19, consider the following examples: