OSPF impact analysis
overview
OSPF failures, or apparent
failures, that are detected by
cannot be analyzed in isolation. Rather, those failures must
be correlated with the physical-transport failures that are detected by
IP Availability Manager
in order to determine the root-cause problem that is
underlying all observed symptoms.
analyzes OSPF and physical-transport failures to determine
whether an OSPF failure is indeed a root-cause problem, or simply a symptom
(impact) of an underlying physical-transport root-cause problem.
When
detects an OSPF failure, it checks for any
physical-transport problem that might be causing the failure. If it does not
find such a problem,
focuses its analysis on just the OSPF domain and performs
the root-cause analysis described in
Chapter 3, “OSPF Objects and their
Failures.”
If it does find such a problem,
diagnoses the OSPF failure as an impact and exports the
underlying physical-transport problem and the OSPF failure to the
Global Manager
.
The
Global Manager
responds by adding the OSPF failure as an impact of the underlying
physical-transport root-cause problem.
OSPF and global impact
analysis shows the flow of information between the components in a
deployment to achieve OSPF and global impact analysis.
OSPF and global
impact analysis

Status updates
received from IP Availability Manager identifies the
IP Availability Manager
status updates to which
subscribes.
Object
| Problem-type status
| Event-type status
|
|---|---|---|
1**Indentation indicates
class hierarchy.
2**Perceived as a
problem-type status by
.
| ||
Card
| Down
| |
NetworkAdapter Interface 1 Port
| Disabled,
Down
| |
NetworkConnection Cable
1 TrunkCable
| DownOrFlapping 2
| |
UnitaryComputerSystem Router
1 Switch and so on
| Unresponsive 2
| |
imports status information from
IP Availability Manager
through a remote (proxy) accessor, as shown in
Remote accessor
operation for Network Protocol Manager for OSPF.
Remote accessor
operation for Network Protocol Manager for OSPF

“Update object attributes” in
Figure 19
corresponds to “Status updates” in
OSPF and global impact
analysis and in
Status updates
received from IP Availability Manager. Status updates represent changes
to problem-type and event-type instrumentation attribute values.
Adding
IP Availability Manager
as a source to
causes
to import topology and status from the
IP Availability Manager
. The
provides the
instructions for completing this task.