Routing Ruledefs And Packet Inspection - Cisco ASR 5000 series Product Overview

▀ How ECS Works
The following figure illustrates how ruledefs interact with the Protocol Analyzer Stack and Action Engine to produce
charging records.
Figure 179. ECS In-line Service Processing
Incoming
packets
(directed to
ECS by CSS)
Packets entering the ECS subsystem must first pass through the Protocol Analyzer Stack where routing ruledefs apply to
determine which packets to inspect. Then output from this inspection is passed to the Charging Engine, where charging
ruledefs apply to perform actions on the output.

Routing Ruledefs and Packet Inspection

The following figure and the steps that follow describe the details of routing ruledef application during packet
inspection.
▄ Cisco ASR 5000 Series Product Overview
ECS In-Line Service
ruledefs
(rule-application routing)
string, =, >, !, etc.
Protocol
Analyzer Stack
ruledefs
(rule-application charging)
string, =, >, !, etc.
Charging Engine
block
redirect
Xmit
Packet
inspection
output
Enhanced Charging Service Overview
Call
detail
records
OL-22938-02