Root-cause analysis
performs availability-based root-cause analysis of the
discovered IS-IS topology objects. It also relates physical-transport problems to the IS-IS
objects, along the affected data path, that are no longer accessible or experience from
lack of response or performance as a result of the physical-transport problems.
When detects an IS-IS failure,
it checks for any physical-transport problem from
IP Availability Manager
that
might be causing the failure. If it finds such a problem, diagnoses the IS-IS failure as a symptom and exports the
underlying physical-transport problem and the IS-IS symptom to the Global Manager
, as
explained in Chapter 4,
“IS-IS Cross-Domain Impact Correlation Analysis.”If
it does not find such a problem, focuses its analysis on just the IS-IS domain and performs
the root-cause analysis described in this chapter.