Cisco ASR 5000 Series, Обзор продукта

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Enhanced Charging Service Overview
▀ Enhanced Services in ECS
▄ Cisco ASR 5000 Series Product Overview
OL-22938-02
Enhanced Services in ECS
This section describes the enhanced and extended features supported in ECS.
Important:
Features described in this section are license enabled. If you have not previously purchased licenses
for these services, contact your sales representative for more information.
Session Control in ECS
In conjunction with the Cisco ASR 5000 chassis, the ECS provides a high-level network flow and bandwidth control
mechanism through the Session Control system. ECS Session Control feature uses the interaction between SessMgr
subsystem and Static Traffic Policy Infrastructure support of the chassis to provide an effective method to maximize
network resource usage and enhancement of overall user experience.
This feature provides the following functionality:
Flow Control Functionality : This functionality provides the ability to define and manage the number of
simultaneous IP-based sessions and/or the number of simultaneous instances of a particular application
permitted for the subscriber.
If a subscriber begins a packet data session and system is either pre-configured or receives a subscriber profile
from the AAA server indicating the maximum amount of simultaneous flow for a subscriber or an application
is allowed to initiate. If subscriber exceeds the limit of allowed number of flows for subscriber or type of
application system blocks/redirect/discard/terminate the traffic.
The following type of flow quotas are available for Flow Control Functionality:
Subscriber-Level Session Quota : Configurable on a per-rulebase basis
Application-Level Session Quota : Configurable on a per-charging-action basis
Bandwidth Control Functionality : This functionality allows the operator to apply rate limit to potentially
bandwidth intensive and service disruptive applications.
Using this feature the operator can police and prioritize subscribers‘ traffic to ensure that no single or group of
subscribers‘ traffic negatively impacts another subscribers‘ traffic.
For example, if a subscriber is running a P2P file sharing program and the system is pre-configured to detect
and limit the amount of bandwidth to the subscriber for P2P application. The system gets the quota limit for
bandwidth from PDP context parameter or individual subscriber. If the subscriber‘s P2P traffic usage exceeds
the pre-configured limit, the Session Control discards the traffic for this subscriber session.
Session Control feature in ECS also provides the controls to police any traffic to/from a subscriber/application
with the chassis.