Cisco ASR 5000 Series Instruction Manual

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Cisco ASR 5000 Series Gateway GPRS Support Node Administration Guide
© 2010 Cisco Systems, Inc. and/or its affiliated entities. All rights reserved.

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CONTENTS
About this Guide ............................................................................................... vii
Conventions Used..................................................................................................................................................viii
Contacting Customer Support .................................................................................................................................. x
GGSN Support in GPRS/UMTS Wireless Data Services ............................... 11
Product Description................................................................................................................................................ 12
Product Specification ............................................................................................................................................. 13
Licenses ............................................................................................................................................................. 13
Hardware Requirements ....................................................................................................................................13
ASR 5000 Platform System Hardware Components .................................................................................... 13
Operating System Requirements .......................................................................................................................14
Network Deployment and Interfaces...................................................................................................................... 15
GGSN in the GPRS/UMTS Data Network........................................................................................................ 15
Supported Interfaces .......................................................................................................................................... 16
Features and Functionality - Base Software ........................................................................................................... 19
16,000 SGSN Support .......................................................................................................................................20
AAA Server Groups ..........................................................................................................................................20
Access Control List Support..............................................................................................................................20
ANSI T1.276 Compliance .................................................................................................................................21
APN Support...................................................................................................................................................... 21
Bulk Statistics Support ...................................................................................................................................... 22
Direct Tunnel Support .......................................................................................................................................23
DHCP Support................................................................................................................................................... 24
DSCP Marking ..................................................................................................................................................25
Generic Corporate APN..................................................................................................................................... 25
GTPP Support....................................................................................................................................................25
Host Route Advertisement.................................................................................................................................26
IP Policy Forwarding.........................................................................................................................................27
IP Header Compression - Van Jacobson............................................................................................................27
IPv6 Support......................................................................................................................................................28
Management System Overview .........................................................................................................................29
Overlapping IP Address Pool Support............................................................................................................... 31
PDP Context Support......................................................................................................................................... 32
Per APN Configuration to Swap out Gn to Gi APN in CDRs ........................................................................... 33
Port Insensitive Rule for Enhanced Charging Service....................................................................................... 33
Quality of Service Support ................................................................................................................................33
RADIUS Support............................................................................................................................................... 34
RADIUS VLAN Support...................................................................................................................................35
Routing Protocol Support ..................................................................................................................................36
Support of Charging Characteristics Provided by AAA Server.........................................................................37
Support of all GGSN generated causes for partial G-CDR closure ................................................................... 37
Threshold Crossing Alerts (TCA) Support ........................................................................................................38
Features and Functionality - Optional Enhanced Feature Software ....................................................................... 39
Common Gateway Access Support ................................................................................................................... 39
Converged DSL Support on the GGSN.............................................................................................................40
Dynamic RADIUS Extensions (Change of Authorization) ............................................................................... 40
GRE Protocol Interface Support........................................................................................................................41

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Gx Interface Support ......................................................................................................................................... 42
Inter-Chassis Session Recovery ........................................................................................................................ 43
IP Security (IPSec) ............................................................................................................................................ 45
IPv6 Support...................................................................................................................................................... 46
L2TP LAC Support ........................................................................................................................................... 48
L2TP LNS Support............................................................................................................................................ 48
Lawful Intercept ................................................................................................................................................ 48
Mobile IP Home and Foreign Agents................................................................................................................ 49
Mobile IP NAT Traversal.................................................................................................................................. 50
Multimedia Broadcast Multicast Services Support ........................................................................................... 51
Overcharging Protection on Loss of Coverage.................................................................................................. 51
Proxy Mobile IP ................................................................................................................................................ 52
Session Persistence............................................................................................................................................ 52
Session Recovery Support................................................................................................................................. 53
Traffic Policing and Rate Limiting.................................................................................................................... 54
Web Element Management System................................................................................................................... 55
How GGSN Works ................................................................................................................................................ 57
PDP Context Processing.................................................................................................................................... 57
Dynamic IP Address Assignment...................................................................................................................... 58
Subscriber Session Call Flows .......................................................................................................................... 59
Transparent Session IP Call Flow................................................................................................................. 60
Non-Transparent IP Session Call Flow ........................................................................................................ 61
Network-Initiated Session Call Flow............................................................................................................ 64
PPP Direct Access Call Flow ....................................................................................................................... 65
Virtual Dialup Access Call Flow.................................................................................................................. 67
Corporate IP VPN Connectivity Call Flow .................................................................................................. 69
Mobile IP Call Flow ..................................................................................................................................... 71
Proxy Mobile IP Call Flows ......................................................................................................................... 74
IPv6 Stateless Address Autoconfiguration Flows......................................................................................... 77
Supported Standards............................................................................................................................................... 79
3GPP References............................................................................................................................................... 79
IETF References................................................................................................................................................ 80
Object Management Group (OMG) Standards.................................................................................................. 83
Understanding the Service Operation ............................................................ 85
Terminology........................................................................................................................................................... 86
Contexts............................................................................................................................................................. 86
Logical Interfaces.............................................................................................................................................. 87
Bindings ............................................................................................................................................................ 88
Services ............................................................................................................................................................. 89
How the System Selects Contexts.......................................................................................................................... 91
Context Selection for Subscriber Sessions ........................................................................................................ 91
GGSN Configuration Example......................................................................... 93
Information Required............................................................................................................................................. 95
Source Context Configuration........................................................................................................................... 95
Destination Context Configuration.................................................................................................................... 98
How This Configuration Works........................................................................................................................... 103
Transparent IP PDP Context Processing ......................................................................................................... 103
Non-transparent IP PDP Context Processing .................................................................................................. 105
PPP PDP Context Processing .......................................................................................................................... 107
Network-requested PDP Context Processing .................................................................................................. 109
Mobile IP Configuration Examples................................................................ 111
Example 1: Mobile IP Support Using the System as a GGSN/FA....................................................................... 112
Information Required ...................................................................................................................................... 113
Source Context Configuration .................................................................................................................... 113

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AAA Context Configuration....................................................................................................................... 116
Mobile IP Destination Context Configuration ............................................................................................ 119
Optional Destination Context Configuration ..............................................................................................120
How This Configuration Works ...................................................................................................................... 121
Example 2: Mobile IP Support Using the System as an HA ................................................................................ 124
Information Required.......................................................................................................................................125
Source Context Configuration .................................................................................................................... 125
Destination Context Configuration ............................................................................................................. 128
How This Configuration Works ...................................................................................................................... 129
Example 3: HA Using a Single Source Context and Multiple Outsourced Destination Contexts ........................ 132
Information Required.......................................................................................................................................134
Source Context Configuration .................................................................................................................... 134
Destination Context Configuration ............................................................................................................. 137
System-Level AAA Configuration .............................................................................................................139
How This Configuration Works ...................................................................................................................... 140
GGSN and Mobile IP Service in a Single System Configuration Example143
Using the System as Both a GGSN/FA and an HA.............................................................................................. 144
Information Required.......................................................................................................................................145
Source Context Configuration .................................................................................................................... 146
Destination Context Configuration ............................................................................................................. 148
Mobile IP Destination Context Configuration ............................................................................................ 152
How This Configuration Works ...................................................................................................................... 156
GGSN Service Configuration Procedures.................................................... 159
GGSN Service Configuration............................................................................................................................... 160
GGSN Service Creation and Binding .............................................................................................................. 160
Accounting Context and Charging Characteristics Configuration................................................................... 161
SGSN and PLMN Policy Configuration.......................................................................................................... 161
Network-requested PDP Context Support Configuration ................................................................................ 162
GGSN Configuration Verification...................................................................................................................162
GTPP Accounting Support Configuration............................................................................................................ 165
GTPP Group Creation...................................................................................................................................... 166
GTPP Group Configuration.............................................................................................................................166
GTPP Group Configuration Verification......................................................................................................... 167
APN Configuration............................................................................................................................................... 169
APN Creation and Configuration .................................................................................................................... 169
Authentication, Accounting, and GTPP Group Configuration in APN ........................................................... 170
Authentication and Accounting Configuration in APN .............................................................................. 170
GTPP Group Association to APN............................................................................................................... 171
IP Address Allocation Method Configuration in APN ....................................................................................171
Charging Characteristics Parameter Configuration in APN ............................................................................172
Virtual APN Configuration..............................................................................................................................172
Other Optional Parameter Configuration in APN............................................................................................ 173
APN Configuration Verification......................................................................................................................174
DHCP Service Configuration ............................................................................................................................... 176
DHCP Service Creation................................................................................................................................... 176
DHCP Server Parameter Configuration........................................................................................................... 177
DHCP Service Configuration Verification ......................................................................................................178
IP Address Pool Configuration on the System ..................................................................................................... 180
IPv4 Pool Creation...........................................................................................................................................181
IPv6 Pool Creation...........................................................................................................................................181
IP Pool Configuration Verification..................................................................................................................182
FA Services Configuration ................................................................................................................................... 184
FA Service Creation ........................................................................................................................................184
IP Interface and UDP Port Binding for Pi Interface ........................................................................................185
Security Parameter Index (SPI) Configuration ................................................................................................186

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FA Agent Advertisement Parameter Configuration ........................................................................................ 186
Subscriber Registration, Authentication and Timeout Parameter Configuration ............................................ 187
Revocation Message Configuration ................................................................................................................ 188
FA Service Configuration Verification ........................................................................................................... 188
Common Gateway Access Support Configuration............................................................................................... 190
Diameter Endpoint Configuration ................................................................................................................... 190
AAA Group Configuration.............................................................................................................................. 191
Authorization over S6b Configuration ............................................................................................................ 191
DNS Client Configuration............................................................................................................................... 192
Duplicate Call Accept Configuration .............................................................................................................. 192
Common Gateway Acces Support Configuration Verification ....................................................................... 193
Verifying and Saving Your Configuration .................................................... 195
Verifying the Configuration................................................................................................................................. 196
Feature Configuration...................................................................................................................................... 196
Service Configuration...................................................................................................................................... 197
Context Configuration..................................................................................................................................... 198
System Configuration...................................................................................................................................... 198
Finding Configuration Errors .......................................................................................................................... 198
Saving the Configuration ..................................................................................................................................... 200
Saving the Configuration on the Chassis ............................................................................................................. 201
Monitoring the Service ................................................................................... 203
Monitoring System Status and Performance ........................................................................................................ 204
Clearing Statistics and Counters .......................................................................................................................... 208
Troubleshooting the Service ......................................................................... 209
Test Commands.................................................................................................................................................... 210
Using the PPP Echo-Test Command............................................................................................................... 210
Using the GTPC Test Echo Command............................................................................................................ 211
Using the GTPU Test Echo Command............................................................................................................ 211
Using the GTPv0 Test Echo Command .......................................................................................................... 212
Using the DHCP Test Command .................................................................................................................... 213
Testing GTPP Accounting with a CGF ........................................................................................................... 213
Testing GTPP Connectivity with a GSS.......................................................................................................... 214
Engineering Rules........................................................................................... 215
APN Engineering Rules ....................................................................................................................................... 216
DHCP Service Engineering Rules........................................................................................................................ 217
GGSN Engineering Rules .................................................................................................................................... 218
GRE Tunnel Interface and VRF Engineering Rules ............................................................................................ 219
GTP Engineering Rules........................................................................................................................................ 220
Interface and Port Engineering Rules................................................................................................................... 221
Pi Interface Rules ............................................................................................................................................ 221
FA to HA Rules .......................................................................................................................................... 221
HA to FA .................................................................................................................................................... 221
GRE Tunnel Interface Rule............................................................................................................................. 222
Lawful Intercept Engineering Rules .................................................................................................................... 223
MBMS Bearer Service Engineering Rules........................................................................................................... 224
Service Engineering Rules ................................................................................................................................... 225
Subscriber Engineering Rules .............................................................................................................................. 226
Mobile-IP and Proxy-MIP Timer Considerations.......................................... 227
Call Flow Summary ............................................................................................................................................. 228
Timer Values and Recommendations .................................................................................................................. 231
Controlling the Mobile IP Lifetime on a Per-Domain Basis ................................................................................ 232

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About this Guide
This document pertains to features and functionality that run on and/or that are related to the Cisco® ASR 5000 Chassis,
formerly the Starent Networks ST40.

About this Guide
▀Conventions Used
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Conventions Used
The following tables describe the conventions used throughout this documentation.
Icon
Notice Type
Description
Information Note
Provides information about important features or instructions.
Caution
Alerts you of potential damage to a program, device, or system.
Warning
Alerts you of potential personal injury or fatality. May also alert you of potential
electrical hazards.
Electro-Static Discharge
(ESD)
Alerts you to take proper grounding precautions before handling a product.
Typeface Conventions
Description
Text represented as a
This typeface represents displays that appear on your terminal screen, for example:
Text represented as
This typeface represents commands that you enter, for example:
This document always gives the full form of a command in lowercase letters. Commands
are not case sensitive.
Text represented as a
This typeface represents a variable that is part of a command, for example:
slot_number is a variable representing the desired chassis slot number.
Text represented as menu or sub-
menu names
This typeface represents menus and sub-menus that you access within a software
application, for example:
Click the File menu, then click New
Command Syntax
Conventions
Description
{ or
}
Required keywords and variables are surrounded by grouped brackets.
Required keywords and variables are those components that are required to be entered as part of the
command syntax.

About this Guide
Conventions Used ▀
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Command Syntax
Conventions
Description
[ or
]
Optional keywords or variables, or those that a user may or may not choose to use, are surrounded by square
brackets.
|
With some commands there may be a group of variables from which the user chooses one. These are called
alternative variables and are documented by separating each variable with a vertical bar (also known as a
pipe filter).
Pipe filters can be used in conjunction with required or optional keywords or variables. For example:
OR
[ | ]

About this Guide
▀Contacting Customer Support
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Contacting Customer Support
Use the information in this section to contact customer support.
For New Customers: Refer to the support area of http://www.cisco.com for up-to-date product documentation or to
submit a service request. A valid username and password is required to this site. Please contact your local sales or
service representative for additional information.
For Existing Customers with support contracts through Starent Networks: Refer to the support area of
https://support.starentnetworks.com/ for up-to-date product documentation or to submit a service request. A valid
username and password is required to this site. Please contact your local sales or service representative for additional
information.
Important: For warranty and repair information, please be sure to include the Return Material Authorization
(RMA) tracking number on the outside of the package.

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Chapter 1
GGSN Support in GPRS/UMTS Wireless Data Services
The Cisco® ASR 5000 chassis provides wireless carriers with a flexible solution that functions as a Gateway GPRS
Support Node (GGSN) in General Packet Radio Service (GPRS) or Universal Mobile Telecommunications System
(UMTS) wireless data networks.
This overview provides general information about the GGSN including:
Product Description
Product Specification
Network Deployment and Interfaces
Features and Functionality - Base Software
Features and Functionality - Optional Enhanced Feature Software
How GGSN Works
Supported Standards

GGSN Support in GPRS/UMTS Wireless Data Services
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Product Description
The GGSN works in conjunction with Serving GPRS Support Nodes (SGSNs) within the network to perform the
following functions:
Establish and maintain subscriber Internet Protocol (IP) or Point-to-Point Protocol (PPP) type Packet Data
Protocol (PDP) contexts originated by either the mobile or the network
Provide charging detail records (CDRs) to the charging gateway (CG, also known as the Charging Gateway
Function (CGF))
Route data traffic between the subscriber‟s Mobile Station (MS) and a Packet Data Networks (PDNs) such as the
Internet or an intranet
PDNs are associated with Access Point Names (APNs) configured on the system. Each APN consists of a set of
parameters that dictate how subscriber authentication and IP address assignment is to be handled for that APN.
In addition, to providing basic GGSN functionality as described above, the system can be configured to support Mobile
IP and/or Proxy Mobile IP data applications in order to provide mobility for subscriber IP PDP contexts. When
supporting these services, the system can be configured to either function as a GGSN and Foreign Agent (FA), a stand-
alone Home Agent (HA), or a GGSN, FA, and HA simultaneously within the carrier's network.
Figure 1. Basic GPRS/UMTS Network Topology
In accordance with RFC 2002, the FA is responsible for mobile node registration with, and the tunneling of data traffic
to/from the subscriber‟s home network. The HA is also responsible for tunneling traffic, but also maintains subscriber
location information in Mobility Binding Records (MBRs).

GGSN Support in GPRS/UMTS Wireless Data Services
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Product Specification
This section describes the hardware and software requirement for GGSN service.
The following information is located in this section:
Licenses
Hardware Requirements
Operating System Requirements
Licenses
The GGSN is a licensed product. A session use license key must be acquired and installed to use the GGSN service.
The following licenses are available for this product:
GGSN Software License, 10K Sessions 600-00-7544
GGSN Software License, 1K Sessions 600-00-7545
Apart from base software license, GGSN requires feature licenses for various enhanced features supported on ASR 5000
platform in GGSN service.
Important: For more information on requirement of licenses for optional enhanced features, refer to Features and
Functionality - Optional Enhanced Feature Software section.
Hardware Requirements
Information in this section describes the hardware required to enable the GGSN service.
ASR 5000 Platform System Hardware Components
The following application and line cards are required to support GPRS/UMTS wireless data services on the system:
System Management Cards (SMCs): Provides full system control and management of all cards within the ASR
5000 platform. Up to two SMCs can be installed; one active, one redundant.
Packet Processing Cards (PSCs/PSC2s/PPCs): In the ASR 5000 platform, packet processing cards provide
high-speed, multi-threaded PDP context processing capabilities for GGSN services. Up to 14 packet processing
cards can be installed, allowing for multiple active and/or redundant cards.

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Switch Processor Input/Outputs (SPIO): Installed in the upper-rear chassis slots directly behind the SMCs,
SPIOs provide connectivity for local and remote management, central office (CO) alarms. Up to two SPIOs
can be installed; one active, one redundant.
Line Cards: The following rear-loaded line cards are currently supported by the system:
Ethernet 10/100 and/or Ethernet 1000 Line Cards: Installed directly behind packet processing cards,
these cards provide the physical interfaces to elements in the LTE/SAE network. Up to 26 line cards
should be installed for a fully loaded system with 13 active packet processing cards, 13 in the upper-
rear slots and 13 in the lower-rear slots for redundancy. Redundant packet processing cards do not
require line cards.
Quad Gig-E Line Cards (QGLCs): The 4-port Gigabit Ethernet line card is used in the ASR 5000
system only and is commonly referred to as the Quad-GigE Line Card or the QGLC. The QGLC is
installed directly behind its associated packet processing card to provide network connectivity to the
packet data network.
10 Gig-E Line Cards (XGLCs): The 10 Gigabit Ethernet Line Card is used in the ASR 5000 system
only and is commonly referred to as the XGLC. The XGLC supports higher speed connections to
packet core equipment, increases effective throughput between the ASR 5000 and the packet core
network, and reduces the number of physical ports needed on the ASR 5000.
The one-port XGLC supports the IEEE 802.3-2005 revision which defines full duplex operation of 10
Gigabit Ethernet.
The XGLC is configured and monitored via the System Management Card (SMC) over the system‟s
control bus. Both SMCs must be active to maintain maximum forwarding rates.
Redundancy Crossbar Cards (RCCs): Installed in the lower-rear chassis slots directly behind the SMCs, RCCs
utilize 5 Gbps serial links to ensure connectivity between Ethernet 10/100 or Ethernet 1000 line cards/QGLCs
and every packet processing card in the system for redundancy. Two RCCs can be installed to provide
redundancy for all line cards and packet processing cards.
Important: Additional information pertaining to each of the application and line cards required to support
GPRS/UMTS wireless data services is located in the Hardware Platform Overview chapter of the Product Overview
Guide.
Operating System Requirements
The GGSN is available for ASR 5000 chassis running StarOS™ Release 7.1 or later.

GGSN Support in GPRS/UMTS Wireless Data Services
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Network Deployment and Interfaces
This section describes the supported interfaces and deployment scenario of GGSN in GPRS/UMTS network.
The following information is provided in this section:
GGSN in the GPRSUMTS Data Network
Supported Interfaces
GGSN in the GPRS/UMTS Data Network
The figures that follow display simplified network views of the GGSN in a GPRS/UMTS network and the system
supporting Mobile IP and Proxy Mobile IP function both the GGSN/Foreign Agent (FA) and GGSN/FA/Home Agent
(HA) combinations respectively.
Figure 2. Basic GPRS/UMTS Network Topology

GGSN Support in GPRS/UMTS Wireless Data Services
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Figure 3. Combined GGSN/FA Deployment for Mobile IP and/or Proxy Mobile IP Support
Figure 4. Combined GGSN/FA/HA Deployment for Mobile IP and/or Proxy Mobile IP Support
Supported Interfaces

GGSN Support in GPRS/UMTS Wireless Data Services
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In support of both mobile and network originated subscriber PDP contexts, the system GGSN provides the following
network interfaces:
Gn: This is the interface used by the GGSN to communicate with SGSNs on the same GPRS/UMTS Public
Land Mobile Network (PLMN). This interface serves as both the signaling and data path for establishing and
maintaining subscriber PDP contexts.
The GGSN communicates with SGSNs on the PLMN using the GPRS Tunnelling Protocol (GTP). The
signaling or control aspect of this protocol is referred to as the GTP Control Plane (GTPC) while the
encapsulated user data traffic is referred to as the GTP User Plane (GTPU).
One or more Gn interfaces can be configured per system context.
Ga: This is the interface used by the GGSN to communicate with the Charging Gateway (CG). The charging
gateway is responsible for sending GGSN Charging Data Records (G-CDRs) received from the GGSN for each
PDP context to the billing system. System supports TCP and UDP as transport layer for this interface.
The GGSN communicates with the CGs on the PLMN using GTP Prime (GTPP).
One or more Ga interfaces can be configured per system context.
Gc: This is the interface used by the GGSN to communicate with the Home Location Register (HLR) via a GTP-
to-MAP (Mobile Application Part) protocol convertor. This interface is used for network initiated PDP
contexts.
For network initiated PDP contexts, the GGSN will communicate with the protocol convertor using GTP. The
convertor, in turn, will communicate with the HLR using MAP over Signaling System 7 (SS7).
One Gc interface can be configured per system context.
Gi: This is the interface used by the GGSN to communicate with Packet Data Networks (PDNs) external to the
PLMN. Examples of PDNs are the Internet or corporate intranets.
Inbound packets received on this interface could initiate a network requested PDP context if the intended MS is
not currently connected.
For systems configured as a GGSN/FA, this interface is used to communicate with HAs for Mobile IP and
Proxy Mobile IP support.
One or more Gi interfaces can be configured per system context. For Mobile IP and Proxy Mobile IP, at least
one Gi interface must be configured for each configured FA service. Note that when the system is
simultaneously supporting GGSN, FA, and HA services, traffic that would otherwise be routed over the Gi
interface is routed inside the chassis.
Gp: This is the interface used by the GGSN to communicate with GPRS Support Nodes (GSNs, e.g. GGSNs
and/or SGSNs) on different PLMNs. Within the system, a single interface can serve as both a Gn and a Gp
interface.
One or more Gn/Gp interfaces can be configured per system context.
AAA: This is the interface used by the GGSN to communicate with an authorization, authentication, and
accounting (AAA) server on the network. The system GGSN communicates with the AAA server using the
Remote Authentication Dial In User Service (RADIUS) protocol.
This is an optional interface that can be used by the GGSN for subscriber PDP context authentication and
accounting.
DHCP: This is the interface used by the GGSN to communicate with a Dynamic Host Control Protocol (DHCP)
Server. The system can be configured as DHCP-Proxy or DHCP Client to provide IP addresses to MS on PDP
contexts activation the DHCP server dynamically.

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Gx: This is an optional Diameter protocol-based interface over which the GGSN communicates with a Charging
Rule Function (CRF) for the provisioning of charging rules that are based on the dynamic analysis of flows
used for an IP Multimedia Subsystem (IMS) session. The system provides enhanced support for use of Service
Based Local Policy (SBLP) to provision and control the resources used by the IMS subscriber. It also provides
Flow based Charging (FBC) mechanism to charge the subscriber dynamically based on content usage.
Important: The Gx interface is a license-enabled support. For more information on this support, refer Gx
Interface Support in Features and Functionality - Optional Enhanced Feature Software section.
Gy: This is an optional Diameter protocol-based interface over which the GGSN communicates with a Charging
Trigger Function (CTF) server that provides online charging data. Gy interface support provides an online
charging interface that works with the ECS deep packet inspection feature. With Gy, customer traffic can be
gated and billed in an “online” or “prepaid” style. Both time- and volume-based charging models are
supported. In all of these models, differentiated rates can be applied to different services based on shallow or
deep packet inspection.
Important: This interface is supported through Enhanced Charging Service. For more information on this
support, refer Enhanced Charging Service Administration Guide.
GRE: This new protocol interface in GGSN platform adds one additional protocol to support mobile users to
connect to their enterprise networks: Generic Routing Encapsulation (GRE). GRE Tunneling is a common
technique to enable multi-protocol local networks over a single-protocol backbone, to connect non-contiguous
networks and allow virtual private networks across WANs. This mechanism encapsulates data packets from
one protocol inside a different protocol and transports the data packets unchanged across a foreign network. It
is important to note that GRE tunneling does not provide security to the encapsulated protocol, as there is no
encryption involved (like IPSEC offers, for example).
Important: The GRE protocol interface is a license-enabled support. For more information on this support, refer
GRE Protocol Interface Support in Features and Functionality - Optional Enhanced Feature Software section.
S6b: This is an optional Diameter protocol-based interface over which the GGSN communicates with 3G
AAA/HSS in LTE/SAE network for subscriber authorization.
Important: This interface is supported through license-enabled feature. For more information on this support,
refer Common Gateway Access Support in guide.
Important: GGSN Software also supports additional interfaces. For more information on additional interfaces,
refer Features and Functionality - Optional Enhanced Feature Software section.

GGSN Support in GPRS/UMTS Wireless Data Services
Features and Functionality - Base Software ▀
Cisco ASR 5000 Series Gateway GPRS Support Node Administration Guide ▄
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Features and Functionality - Base Software
This section describes the features and functions supported by default in base software on GGSN service and do not
require any additional licenses.
Important: To configure the basic service and functionality on the system for GGSN service, refer configuration
examples provide in the GGSN Administration Guide.
This section describes following features:
16,000 SGSN Support
AAA Server Groups
Access Control List Support
ANSI T1.276 Compliance
APN Support
Bulk Statistics Support
Direct Tunnel Support
DHCP Support
DSCP Marking
Generic Corporate APN
GTPP Support
Host Route Advertisement
IP Policy Forwarding
IP Header Compression - Van Jacobson
Management System Overview
Overlapping IP Address Pool Support
Per APN Configuration to Swap out Gn to Gi APN in CDRs
Port Insensitive Rule for Enhanced Charging Service
Quality of Service Support
RADIUS Support
PDP Context Support
RADIUS VLAN Support
Routing Protocol Support
Support of Charging Characteristics Provided by AAA Server
Support of all GGSN generated causes for partial G-CDR closure
Threshold Crossing Alerts (TCA) Support

GGSN Support in GPRS/UMTS Wireless Data Services
▀Features and Functionality - Base Software
▄Cisco ASR 5000 Series Gateway GPRS Support Node Administration Guide
OL-22944-02
16,000 SGSN Support
With growing roaming agreements, many more GPRS/UMTS networks support certain APNs and therefore the number
of SGSNs that could connect to the GGSN increases. This feature increases the number of connected SGSNs thereby
allowing a single GGSN service to support a much larger roaming network.
The GGSN service supports a maximum of 16,000 SGSN IP addresses. The chassis limit for bulk statistics collection is
also limit to 16,000. No change in configuration is needed to support this feature.
AAA Server Groups
Value-added feature to enable VPN service provisioning for enterprise or MVNO customers. Enables each corporate
customer to maintain its own AAA servers with its own unique configurable parameters and custom dictionaries.
This feature provides support for up to 800 AAA (RADIUS and Diameter) server groups and 800 NAS IP addresses that
can be provisioned within a single context or across the entire chassis. A total of 128 servers can be assigned to an
individual server group. Up to 1,600 accounting, authentication and/or mediation servers are supported per chassis and
may be distributed across a maximum of 1,000 APNs. This feature also enables the AAA servers to be distributed across
multiple APN within the same context.
Important: Due to additional memory requirements, this service can only be used with 8GB minimum packet
processing cards.
Important: For more information on AAA Server Group configuration, refer AAA Interface Administration and
Reference.
Access Control List Support
Access Control Lists provide a mechanism for controlling (i.e permitting, denying, redirecting, etc.) packets in and out
of the system.
IP access lists, or Access Control Lists (ACLs) as they are commonly referred to, are used to control the flow of packets
into and out of the system. They are configured on a per-context basis and consist of “rules” (ACL rules) or filters that
control the action taken on packets that match the filter criteria
Once configured, an ACL can be applied to any of the following:
An individual interface
All traffic facilitated by a context (known as a policy ACL)
An individual subscriber
All subscriber sessions facilitated by a specific context