Cisco Intelligent Wireless Access Gateway User manual

Intelligent Wireless Access Gateway Configuration Guide

First Published: July 26, 2013

Last Modified: March 28, 2014

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Text Part Number: OL-30226-03

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CONTENTS

CHAPTER 1

Overview of the Intelligent Wireless Access Gateway 1

Finding Feature Information 1

Prerequisites for the iWAG 2

Restrictions for the iWAG 2

Information About the iWAG 2

Benefits of the iWAG 3

AAA Attributes 3

Supported Hardware and Software Compatibility Matrix for the iWAG 7

How to Configure the iWAG 8

Configuring the iWAG for Simple IP Users 8

Configuring the iWAG for 3G Mobile IP Users 8

Configuring Authentication, Authorization, and Accounting for the iWAG 8

Configuring DHCP when the iWAG Acts as a DHCP Proxy 10

Configuring the Cisco ISG Class Map and Policy Map for the iWAG 12

Configuring a Session Initiator for the iWAG 15

Configuring a Tunnel Interface for the iWAG 16

Enabling Mobile Client Service Abstraction 17

Configuring the GTP of the iWAG 18

Configuring the iWAG for 4G Mobile IP Users 21

Configuring PMIPv6 for the iWAG 21

Enabling Mobile Client Service Abstraction 21

Additional References 22

Feature Information for the Intelligent Wireless Access Gateway 23

CHAPTER 2

IP Sessions Over Gigabit EtherChannel 25

Finding Feature Information 25

Restrictions for IPoGEC 25

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Information About IP Sessions over Gigabit EtherChannel 26

Supported Features for IPoGEC 26

Configuring IP Sessions over Gigabit EtherChannel 26

Configuring Member Links for IP Sessions over Gigabit EtherChannel 28

Configuration Examples for IP Sessions Over Gigabit EtherChannel 29

Additional References 29

Feature Information for IP Sessions over Gigabit EtherChannel 30

CHAPTER 3

Multiple-Flow Tunnel 33

Finding Feature Information 33

Information About Multiple-Flow Tunnel 33

Additional References 34

Feature Information for Multiple-Flow Tunnel 35

CHAPTER 4

Service Provider WiFi: Support for Integrated Ethernet Over GRE 37

Finding Feature Information 37

Information About Ethernet Over GRE 38

Restrictions for Configuring Ethernet Over GRE 38

Prerequisites for Configuring Ethernet Over GRE 39

Information About Configuring Ethernet Over GRE 39

EoGRE Deployment with PMIPv6 Integrated for Mobility Service 42

EoGRE Deployment with GTP Integrated for Mobility Service 43

EoGRE Deployment with ISG Integrated for Simple IP Service 43

Supported Features 44

How to Configure the EoGRE Feature 45

Example: Configuring the EoGRE Feature 46

Additional References 48

Feature Information for Configuring Ethernet Over GRE 49

CHAPTER 5

GTPv2 Support in the iWAG 51

Finding Feature Information 51

Restrictions for GTPv2 of the iWAG 51

Information About GTPv2 in the iWAG 52

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Contents

GTPv2 Configuration 52

RADIUS Configuration 53

Intra-iWAG Roaming 53

Configuration for the GTPv1 and GTPv2 Roaming Scenario 53

Additional References 54

Feature Information for GTPv2 Support in the iWAG 55

CHAPTER 6

iWAG SSO Support for GTP 57

Finding Feature Information 57

Information About iWAG SSO Support for GTP 57

Enabling SSO Support for the GTP 58

Additional References 59

Feature Information for iWAG SSO Support for GTP 60

CHAPTER 7

Configuring ISG Policy Templates 61

Finding Feature Information 61

Restrictions for Configuring ISG Policy Templates 61

Information About Configuring ISG Policy Templates 61

How to Configure ISG Policy Templates 62

Additional References 62

Feature Information for Configuring ISG Policy Templates 63

CHAPTER 8

Cisco ISG Accounting Accuracy for LNS Sessions 65

Finding Feature Information 65

Information About Cisco ISG Accounting Accuracy for LNS Sessions 65

Additional References 66

Feature Information for Cisco ISG Accounting Accuracy for LNS Sessions 67

CHAPTER 9

Dual Stack Support for PMIPv6 and GTP 69

Finding Feature Information 69

Information About Dual-Stack Support for PMIPv6 69

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Contents

Features Supported for Dual-Stack PMIPv6 Sessions 70

Information About Dual-Stack Support for GTP 70

Restrictions for Dual-Stack GTP 70

AAA Attributes for Dual Stack 70

Configuration Examples for Dual-Stack PMIPv6 71

Example: Configuring an Access List Traffic Classmap for Dual-Stack PMIPv6 71

Example: Configuring a Classmap for Dual-Stack PMIPv6 71

Example: Configuring a Policymap for Dual-Stack PMIPv6 72

Example: Configuring a Control Policy for Dual-Stack PMIPv6 72

Example: Configuring an Access Interface for Dual-Stack PMIPv6 73

Example: Configuring the Local Mobility Anchor for Cisco ASR 5000 Routers 73

Example: Configuring Mobile Access Gateways for Dual-Stack PMIPv6 74

Configuration Examples for Dual-Stack GTP 75

Example: Configuring Dual-Stack Sessions for GTP 75

Example: Configuring an Interface to PGW or GGSN 75

Example: Configuring a Control Policy for Dual-Stack GTP 75

Example: Configuring an Access Interface for Dual-Stack GTP 75

Enabling IPv6 Routing 76

Additional References 76

Feature Information for Dual-Stack Support for PMIPv6 and GTP 77

CHAPTER 10

Flow-Based Redirect 79

Finding Feature Information 79

Flow-Based Redirect for Adult Content Filtering 80

Flow-Based Redirect for Selective IP Traffic Offload 81

Activating and Deactivating the Flow-Based Redirect Feature Through Vendor-Specific

Attributes 82

Configuring Flow-Based Redirect for a Traffic Class Service 82

Examples 85

Best Practices for Configuring the NAT on the Cisco ASR 1000 Series Routers 87

NAT Overloading and Port Parity 88

NAT Interface Overloading with VRF 88

Additional References 89

Feature Information for Flow-Based Redirect 89

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Contents

CHAPTER 11

Call Flows for Simple IP Users 91

Finding Feature Information 91

Simple IP Unclassified MAC Authentication (MAC TAL and Web Login) Call Flows 91

Simple IP Unclassified MAC with MAC TAL Authentication Call Flow 93

Simple IP Unclassified MAC with Web Login Authentication Call Flow 95

Simple IP Unclassified MAC Authentication Call Flow Configuration 96

Additional References 98

Feature Information for Call Flows for Simple IP Users 99

CHAPTER 12

Call Flows for 3G and 4G Mobile IP Users 101

Finding Feature Information 101

3G DHCP Discover Call Flow 101

3G DHCP Discover Call Flow Configuration 104

4G DHCP Discover Call Flow 108

4G DHCP Discover Call Flow Configuration 110

4G Roaming Call Flow 111

4G Roaming Call Flow Configuration 114

Additional References 115

Feature Information for Call Flows for 3G and 4G Mobile IP Users 116

116

CHAPTER 13

Call Flows for Dual-Stack PMIPv6 and GTP 117

Finding Feature Information 117

Dual-Stack Mobile IPoE Session with DHCPv4 as FSOL for PMIPv6 Call Flow 118

Dual-Stack Mobile IPoE Session with IPv6 ND as FSOL for PMIPv6 Call Flow 121

Dual-Stack Mobile IPoE Session with DHCPv4 as FSOL for GTP Call Flow 124

Dual-Stack Mobile IPoE Session with IPv6 ND as FSOL for GTP Call Flow 126

Additional References 128

Feature Information for Call Flows for Dual-Stack PMIPv6 and GTP 129

130

CHAPTER 14

iWAG Scalability and Performance 131

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Contents

iWAG Scaling 131

Restrictions for iWAG Scalability 132

Layer 4 Redirect Scaling 133

Configuring Call Admission Control 133

Walk-by User Support for PWLAN in iWAG 133

Additional References 134

Feature Information for iWAG Scalability and Performance 135

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Contents

CHAPTER 1

Overview of the Intelligent Wireless Access

Gateway

Service providers use a combination of WiFi and mobility offerings to offload their mobility networks in

the area of high-concentration service usage. This led to the evolution of the Intelligent Wireless Access

Gateway (iWAG).

The iWAG provides a WiFi offload option to 4G and 3G service providers by enabling a single-box solution

that provides the combined functionality of Proxy Mobile IPv6 (PMIPv6) and GPRS Tunneling Protocol

(GTP) on the Cisco Intelligent Services Gateway (Cisco ISG) framework. This document provides information

about the iWAG and how to configure it, and contains the following sections:

•Finding Feature Information, page 1

•Prerequisites for the iWAG, page 2

•Restrictions for the iWAG, page 2

•Information About the iWAG, page 2

•How to Configure the iWAG, page 8

•Additional References, page 22

•Feature Information for the Intelligent Wireless Access Gateway, page 23

Finding Feature Information

Your software release may not support all the features documented in this module. For the latest caveats and

feature information, see Bug Search Tool and the release notes for your platform and software release. To

find information about the features documented in this module, and to see a list of the releases in which each

feature is supported, see the feature information table at the end of this module.

Use Cisco Feature Navigator to find information about platform support and Cisco software image support.

To access Cisco Feature Navigator, go to www.cisco.com/go/cfn. An account on Cisco.com is not required.

Intelligent Wireless Access Gateway Configuration Guide

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Prerequisites for the iWAG

•Enable mobile client service abstraction (MCSA).

•Enable the ipv6 unicast-routing command.

Restrictions for the iWAG

•Roaming from a 3G mobility network to a WLAN is not supported for the GTP and Cisco ISG sessions.

•IP subscriber-routed (L3) sessions are not supported.

•IPv6 and quality of service (QoS) are not supported in a 3G mobility network.

•Only newly established calls are offloaded to the WLAN Third-Generation Partnership Project (3GPP)

IP access.

•The iWAG solution for WLAN offload is currently available only for the 3G Universal Mobile

Telecommunications System (UMTS).

Information About the iWAG

The iWAG deployment includes a combination of simple IP users (traditional ISG and WiFi) and mobile IP

users (PMIPv6 or GTP tunneling). The term mobility service is used to refer to either the GTP service or the

PMIPv6 service applied to user traffic. The iWAG provides mobility services to mobile IP users, and as a

result, a mobile client can seamlessly access a 3G or 4G mobility network. However, the iWAG does not

provide mobility services to simple IP users. Therefore, simple IP users can access the Public Wireless LAN

(PWLAN) network through the Cisco ISG. Clients are devices that access WiFi Internet (public wireless),

where possible. However, if WiFi is not available, the same clients can

connect to the Internet service using a 3G or 4G mobility network.

The iWAG has a transport or switching element with Cisco ISG subscriber awareness. The iWAG also has

RADIUS-based authentication and accounting, and policy-based subscriber routing for the WiFi wholesale

model.

For more information about the iWAG, see the Overview of iWAG video.

Intelligent Wireless Access Gateway Configuration Guide

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Overview of the Intelligent Wireless Access Gateway

Prerequisites for the iWAG

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