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
.