Cisco Systems 3.5 Manual De Usuario

Cisco Active Network Abstraction Administrator’s Guide, 3.5

 

 

Page 162 

Cisco Systems, Inc. 

•  A rule can perform many types of actions, such as: 

•  Add or remove an object from the working memory 
•  Modify an object 
•  Execute a method on one of the objects 

•  The Agenda is where Drools stores the list of rules to be fired. 

The Drools rule engine enables the user to extend the ANA alarm correlation 
mechanism with user-defined rules and business logic. 

The Drools rule engine is fully integrated within the Cisco ANA Gateway 
and does not require any synchronization or maintenance. It can access all 
ANA information and functions: 
•  Use up-to-date network information (topology, hierarchy, inventory) as 

part of its rule processing 

•  Create and manipulate alarms, and send commands to NEs 
•  Define operator-logic rules, such as: 

•  If the alarm was not attended to within 2 hours then… 
•  If there are more than 5 open alarms on this device then… 
•  If today is Tuesday then… 

The rules are written for Drools in xml format files, and can be modified and 
reloaded in runtime. There is neither a need to compile the rules, nor to 
restart any ANA component. 

ANA maintains two Drools processing instances (Contexts), with two 
respective rule files: 
•  Pre-correlation processing context 
•  Post-correlation processing context 

The Rule files are located under 

 in the ANA 

Gateway server. 

The Drools mechanism runs in two processing contexts:  
•  Pre-correlation context – defined in the 

 rule file 

•  Post-correlation context – defined in the 

 rule file.