Analysis
The status updates, which are
acquired from
IP Availability Manager
and from periodic monitoring, serve as input to the data
model in the
repository.
applies the status updates to the appropriate attributes of
the corresponding IS-IS objects in the data model.
The data model involves a
codebook that is created by VMware engineers as a result of their knowledge of
IP and IS-IS networks. The codebook identifies IP and IS-IS problems and their
symptoms, and presents a causality mapping between each problem and its set of
symptoms.
diagnoses root-cause availability problems by finding the
problems in the codebook that can best explain the observed symptoms. It also
uses the codebook to correlate the impact of a root-cause problem on the IS-IS
objects that are either inaccessible or impaired as a result of the root-cause
problem. The root-cause problem is either a physical-transport problem that is
diagnosed by
IP Availability Manager
or an IS-IS problem that is diagnosed by
.