Cisco Intelligent Wireless Access Gateway, Руководство по настройке

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Layer 4 Redirect Scaling
The ASR 1000 supports the ability to redirect IP traffic within an ISG traffic class. Layer 4 redirect scaling
is performed by the Quantum Flow Processor (QFP). The scaling limits are dependent on the ESP.
Table 16: Maximum Number of Per-Session Limit Per ESP
Default Per-Session
Limit L4 Redirect
Translations ESP RP Chassis
128 256000 ESP-2.5G Integrated 1001
128 256000 ESP-5G ESP
licensing from 5G,
10G, 20, or 36G Integrated 1002-X
128 1 Million ESP-40G RP2 1004, 1006, 1013
128 1 Million ESP-100G RP2 1006, 1013
Configuring Call Admission Control
The Call Admission Control (CAC) feature is configured to protect the ASR 1000 processing resources that
must be configured. CAC can restrict creation of new sessions when system resources exceed configured
thresholds.
For examples about configuring the CAC for IPoE feature, see the “ Call Admission Control ” section in the
Intelligent Wireless Access Gateway Configuration Guide located at:
http://www.cisco.com/en/US/docs/routers/asr1000/configuration/guide/chassis/IWAG_Config_Guide_
BookMap_chapter_01001.html
Walk-by User Support for PWLAN in iWAG
In public wireless LAN (PWLAN) setups, a high number of ISG sessions might be unauthenticated sessions
from wireless devices that do not use the PWLAN service. These sessions are referred to in this document as
walk-by sessions, and users that use these sessions are referred to as walk-by users.
Walk-by sessions, if not dealt with in an optimized way, may consume a large portion of the hardware resources.
This resource utilization may lead to an increase in the number of ISG routers required for a given PWLAN
deployment. The concept of light-weight sessions is introduced to provide an optimization for walk-by sessions.
The features for walk-by users are configured on a default session acting as a template. Walk-by users are
then assigned light-weight sessions that inherit features from a default session. The features are configured
only once on the default session, thereby optimizing the resource usage.
A lite session is a light-weight unauthenticated ISG session that inherits default session services. Lite sessions
are created on ISG to support walk-by users and optimize resource usage. A timer may be specified to limit
Intelligent Wireless Access Gateway Configuration Guide
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iWAG Scalability and Performance
Layer 4 Redirect Scaling