PDN Gateway Overview
▀ Features and Functionality - Optional Enhanced Feature Software
▄ Cisco ASR 5x00 Packet Data Network Gateway Administration Guide
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Lawful Intercept
The feature use license for Lawful Intercept on the P-GW is included in the P-GW session use license.
The Cisco Lawful Intercept feature is supported on the P-GW. Lawful Intercept is a licensed-enabled, standards-based
feature that provides telecommunications service providers with a mechanism to assist law enforcement agencies in
monitoring suspicious individuals for potential illegal activity. For additional information and documentation on the
Lawful Intercept feature, contact your Cisco account representative.
Layer 2 Traffic Management (VLANs)
Use of Layer 2 Traffic Management requires that a valid license key be installed. Contact your local Sales or Support
representative for information on how to obtain a license.
Virtual LANs (VLANs) provide greater flexibility in the configuration and use of contexts and services.
VLANs are configured as “tags” on a per-port basis and allow more complex configurations to be implemented. The
VLAN tag allows a single physical port to be bound to multiple logical interfaces that can be configured in different
contexts; therefore, each Ethernet port can be viewed as containing many logical ports when VLAN tags are employed.
Important:
For more information on VLAN support, refer to the
VLANs
chapter in the
System Administration
Guide
.
Local Policy Decision Engine
Use of the Local Policy Decision Engine requires that a valid license key be installed. Contact your local Sales or
Support representative for information on how to obtain a license.
The Local Policy Engine is an event-driven rules engine that offers Gx-like QoS and policy controls to enable user or
application entitlements. As the name suggests, it is designed to provide a subset of a PCRF in cases where an operator
elects not to use a PCRF or scenarios where connections to an external PCRF are disrupted. Local policies are used to
control different aspects of a session like QoS, data usage, subscription profiles, and server usage by means of locally
defined policies. A maximum of 1,024 local policies can be provisioned on a P-GW system.
Local policies are triggered when certain events occur and the associated conditions are satisfied. For example, when a
new call is initiated, the QoS to be applied for the call could be decided based on the IMSI, MSISDN, and APN.
Potential uses cases for the Local Policy Decision Engine include:
Disaster recovery data backup solution in the event of a loss of PCRF in a mobile core network.
Dedicated bearer establishment for emergency voice calls.
Network-initiated bearer establishment on LTE to non-3GPP inter-domain handovers.
Important:
For more information on configuring the Local Policy Decision Engine, refer to the
Configuring
Local QoS Policy
section in the
PDN Gateway Configuration
chapter of this guide.