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.
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 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.