How Ecs Works - Cisco ASR 5000 series Product Overview

▀ How ECS Works

How ECS Works
This section describes the major components of the ECS solution, and the roles they play.
Content Service Steering: Redirects incoming traffic to the ECS subsystem
Protocol Analyzer: Performs inspection of incoming packets
Rule Definitions: Specifies the packets to inspect or the charging actions to apply to packets based on content
Rulebases: Allows grouping one or more number of rule definitions together to define the billing policies for
individual subscribers or group of subscribers
Content Service Steering
Content Service Steering (CSS) enables directing selective subscriber traffic into the ECS subsystem (In-line services
internal to the system) based on the content of the data presented by mobile subscribers.
CSS uses Access Control Lists (ACLs) to redirect selective subscriber traffic flows. ACLs control the flow of packets
into and out of the system. ACLs consist of ―rules‖ (ACL rules) or filters that control the action taken on packets
matching the filter criteria.
ACLs are configurable on a per-context basis and applies to a subscriber through either a subscriber profile (for PDSN)
or an APN profile (for GGSN) in the destination context.
Important:
Feature Configuration Guide. For more information on ACLs, refer to the IP Access Control Lists chapter of the System
Enhanced Feature Configuration Guide.
Protocol Analyzer
The Protocol Analyzer is the software stack responsible for analyzing the individual protocol fields and states during
packet inspection.
The Protocol Analyzer performs two types of packet inspection:
Shallow Packet Inspection: Inspection of the layer 3 (IP header) and layer 4 (for example, UDP or TCP header)
information.
Deep Packet Inspection: Inspection of layer 7 and 7+ information. DPI functionality includes:
▄ Cisco ASR 5000 Series Product Overview
For more information on CSS, refer to the Content Service Steering chapter of the System Enhanced
Detection of Uniform Resource Identifier (URI) information at level 7 (for example, HTTP, WTP,
RTSP URLs)
Enhanced Charging Service Overview
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