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

Status updates
received from IP Availability Manageridentifies 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 repository access or, as shown in
Synchronizing topology
object event status.
Synchronizing
topology object event status

“Update remote instrumented
attributes” in
Synchronizing topology
object event statuscorresponds to “Status updates” in
BGP and global impact
analysisand in
Status updates
received from IP Availability Manager. Status updates represent the
activation or clearing of events for the topology objects that are identified
in
Status updates
received from IP Availability Manager.
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.