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Avaya Integrated Management
Centralized (hybrid)
The centralized management model strives to make all network management available in a
central location. It generally begins with a framework product such as HP OpenView NNM. This
framework product serves as an SNMP trap receiver for alarm data sent by networking devices.
It also provides network topology discovery and availability testing.
Figure 67: Centralized management model
Additional management tools, such as Avaya MultiService Network Manager, attach to the
framework
(Figure 67: Centralized management
the underlying application, and can share data with it. This allows a network administrator to go
to a central location for most network management and configuration tasks. Client devices are
configured to send alarm and event data to the centralized manager, generally through SNMP.
The management station also has the ability to periodically poll the client for specific
information. This can be used to graph performance, for example. Polling can also be used for
inventory management.
There are many advantages to this model:
Because a centralized location is used, fewer administrators are required to manage a
network.
Administrators are more likely to catch critical information because it is all in one place.
Administrators need to learn fewer interfaces, which reduces training costs.
More advanced centralized management products offer event correlation, which increases
the likelihood of proactively catching a problem before it adversely affects users.
The disadvantage to the centralized model is cost. Typically, centralized management tools cost
more than distributed tools. In addition, the implementation and integration can be complex.
Finally, the enterprise must adjust the manager as the network changes. If the management
server is not actively maintained, it quickly falls into disuse.
226 Avaya Application Solutions IP Telephony Deployment Guide
model). They can be launched directly from
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