EIGRP impact analysis
overview
EIGRP failures, or apparent
failures, 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 EIGRP and physical-transport failures to determine
whether an EIGRP failure is indeed a root-cause problem, or simply a symptom
(impact) of an underlying physical-transport root-cause problem.
When
detects an EIGRP 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 EIGRP domain and performs
the root-cause analysis described in
Chapter 3, “EIGRP
Objects and their Failures.”
If it does find such a problem,
diagnoses the EIGRP failure as an impact and exports the
underlying physical-transport problem and the EIGRP failure to the
Global Manager
.
The
Global Manager
responds by adding the EIGRP failure as an impact of the underlying
physical-transport root-cause problem.
EIGRP and global
impact analysis shows the flow of information between the components in
a
deployment to achieve EIGRP and global impact analysis.
EIGRP 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 EIGRP.
Remote accessor
operation for Network Protocol Manager for EIGRP

“Update object attributes” in
Figure 18
corresponds to “Status updates” in
EIGRP 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.