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.
Status updates received from IP Availability Manager
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.