GSM Association Non-confidential Official Document IR.34 - Guidelines for IPX Provider networks (Previously Inter-Service Provider IP Backbone Guidelines) Guidelines for IPX Provider networks (Previously Inter- Service Provider IP Backbone Guidelines) Version 13.0 17 October 2016 This is a Non-binding Permanent Reference Document of the GSMA Security Classification: Non-confidential Access to and distribution of this document is restricted to the persons permitted by the security classification. This document is confidential to the Association and is subject to copyright protection. This document is to be used only for the purposes for which it has been supplied and information contained in it must not be disclosed or in any other way made available, in whole or in part, to persons other than those permitted under the security classification without the prior written approval of the Association. Copyright Notice Copyright © 2016 GSM Association Disclaimer The GSM Association (“Association”) makes no representation, warranty or undertaking (express or implied) with respect to and does not accept any responsibility for, and hereby disclaims liability for the accuracy or completeness or timeliness of the information contained in this document. The information contained in this document may be subject to change without prior notice. Antitrust Notice The information contain herein is in full compliance with the GSM Association’s antitrust compliance policy. V13.0 Page 1 of 50 GSM Association Non-confidential Official Document IR.34 - Guidelines for IPX Provider networks (Previously Inter-Service Provider IP Backbone Guidelines) Table of Contents 1. Introduction 3 1.1 Overview 3 1.1.1 Purpose 3 1.1.2 Background 3 1.1.3 About this Document 4 1.2 Scope 4 1.2.1 In Scope 4 1.2.2 Out of Scope 4 1.3 Definition of Terms 5 1.4 Document Cross-References 7 2 The Need for IP Interconnect 8 2.1 General 8 2.2 IPX 9 3 IPX Network Architecture 9 3.1 IPX Network Connection 9 3.2 IPX Architecture 10 3.3 IPX Connectivity Options 11 3.3.1 IPX Transport 11 3.3.2 IPX Service Transit 11 3.3.3 IP Service Hub 11 3.4 IPX Proxy Services 11 3.5 Types of Service Provider and Interconnectivity Allowed 12 4 Requirements of the IPX Networks 12 4.1 General 12 4.2 Separation of IPX Services on IPX Networks 13 4.3 Number of IPX Providers used to Transit Packets between Service Providers 13 4.4 Connections between IPX Provider and Service Provider 14 4.5 Peering Interface 14 4.6 Technical Specification of the IPX Network 15 4.6.1 IP Routing 15 4.6.2 BGP-4 Advertisement Rules 16 4.6.3 IPX Service to VLAN/VPN Mapping and Advertisement 16 4.6.4 IP Addressing and Routing 18 4.6.5 DNS 19 4.6.6 Security and Screening 19 4.6.7 QoS 19 4.6.8 Generic IPX Proxy Requirements 20 5 Technical Requirements for Service Providers 20 5.1 General Service Provider Requirements 20 5.1.1 Service Provider IP Routing 21 5.1.2 Service Provider IP Addressing 21 5.1.3 Service Provider DNS 21 5.1.4 Service Provider Security and Screening 21 V13.0 Page 1 of 50 GSM Association Non-confidential Official Document IR.34 - Guidelines for IPX Provider networks (Previously Inter-Service Provider IP Backbone Guidelines) 5.2 BGP Advertisement Rules 22 5.2.1 General Rules 22 5.3 Service Provider and IPX Network Connectivity 23 6 QoS 24 6.1 SLA for IPX Network 24 6.1.1 Service Guarantees 24 6.1.2 Responsibilities 24 6.2 Traffic classification 25 6.2.1 UMTS QoS parameters 25 6.2.2 EPS QoS Class Identifiers 25 6.2.3 Diffserv Per Hop Behaviour 25 6.2.4 IPX traffic classes 26 6.2.5 Differentiated Services Code Point 26 6.2.6 2G/3G and EPS traffic marking 26 6.2.7 Application traffic marking 27 6.2.8 Packet marking rules 27 6.3 IP QoS Definitions for IPX Network 28 6.3.1 Availability 28 6.3.2 Delay 29 6.3.3 Jitter 32 6.3.4 Packet Loss Rate 34 7 Traffic Applications 34 7.1 GPRS/3G Data Roaming 34 7.2 Service Provider Bilateral Services 35 7.3 WLAN Roaming 35 7.4 MMS Interworking 36 7.5 IMS 36 Annex A Considerations for implementation 38 A.1 A.1 Double IPX Provider network problem 38 A.1.1 Short term solution: Network configuration 38 A.1.2 Short-term solution disadvantages 39 A.1.3 Long-term solution: Network design in Service Provider network 39 Annex B IPX Proxy Requirements 42 B.1 Introduction 42 B.2 Requirements for IPX Proxy 42 B.2.1 General 42 Annex C Document Management 47 C.1 Document History 47 Other Information 49 V13.0 Page 2 of 50 GSM Association Non-confidential Official Document IR.34 - Guidelines for IPX Provider networks (Previously Inter-Service Provider IP Backbone Guidelines) 1. Introduction 1.1 Overview 1.1.1 Purpose The internet Protocol (IP) Packet eXchange (IPX) Network is an inter-Service Provider IP backbone which comprises the interconnected networks of IPX Providers and General Packet Radio Service (GPRS) Roaming eXchange (GRX) Providers. The IPX network supports multiple IPX services. The purpose of this document is to provide guidelines and technical information on how these networks are set-up and interconnect, and how Service Providers will connect to the IPX Provider networks. The services supported on IPX are out of scope for this document and are currently listed in GSMA PRD AA.51. An IPX service is a service that is part of the IPX releases and that requires the IPX network for either isolation from the Internet and/or for quality of service and experience. The terms IPX and IPX network are better defined in AA.51. Contrary to previous versions of IR.34, GRX is now considered an IPX service which is offered on an IPX Network. The term GRX network is no longer used; however, an entity which only offers the GRX service may refer to itself as a GRX Provider. IPX Provider IPX Provider network Peering for IPX services network including GRX IPX Network Peering for Peering for GRX service only GRX service only GRX Provider network Figure 1: IPX Network comprising interconnected networks of GRX and IPX providers This document also defines high level security requirements for the Inter-Service Provider IP network. Detailed complementary requirements can be found in the Permanent Reference Document (PRD): “Inter-Operator IP backbone Security Requirements for Service Providers and Inter-operator IP Backbone Providers” IR.77 [19]. 1.1.2 Background The IPX Network was originally conceived as an inter-Service Provider IP backbone created to carry GTP-tunnels (GPRS Tunnelling Protocol) via the Gp interface between the GPRS Support Nodes (GSNs) in different GSM Operators that is, data roaming. The Gp interface allowed V13.0 Page 3 of 50 GSM Association Non-confidential Official Document IR.34 - Guidelines for IPX Provider networks (Previously Inter-Service Provider IP Backbone Guidelines) mobile end-users to make use of the GPRS/3G services of their home network while roaming in a visited network. Later, Multimedia Messaging Service (MMS) interworking and Wireless Local Area Network (WLAN) authentication data roaming were added as supported services. This original inter-Service Provider IP backbone is in fact an Inter-PLMN (Public Land Mobile Network) IP Backbone and was termed the GRX. The GRX model is used to interconnect in excess of 300 networks and has proven highly successful. With the development of IP-based services, interworking of such services has become an industry wide challenge. The GRX model is applicable as an IP interworking solution; however the GRX specification does not meet all the requirements. It has been recognised that by adding interworking specific functionality to the GRX model and offering it to the industry, a common interconnect platform could be established for IP interworking. The enhanced GRX network is called the IPX network and is designed to support a variety of types of Service Providers in a secure and business sustainable way. The core enhancements to the GRX are end-to-end Quality of Service and the introduction of the service awareness which facilitates interconnect cascade billing and multi-lateral interconnect agreements. 1.1.3 About this Document The document provides a brief introduction to the requirement for IP interworking and the IPX network. The technical architectures of the IPX network are described followed by the technical implementation guidelines for IPX (and GRX) Providers and connecting Service Providers. Technical guidelines for Security, Quality of Service and Traffic applications are also given. Appendices provide details on known issues in the IPX Network and on the requirements for IPX proxies. 1.2 Scope 1.2.1 In Scope IPX Network: an inter-Service Provider IP backbone network architecture which connects Mobile Network Operators (MNOs), Fixed Network Operators (FNOs) Internet Service Providers (ISPs) and Application Service Providers (ASPs), from here on in referred to collectively as "Service Providers". Where there is specific reference to a Service Provider type they shall be directly referred to in each case. Technical guidance to Service Providers for connecting their IP based networks and services together to achieve roaming and/or inter-working services between them. Recommendations for IP addressing. (Applies to inter- and intra-Service Provider nodes only). Host name recommendations remain within the scope of the present document but are further defined in PRD IR.67. 1.2.2 Out of Scope IP addressing and host names of GPRS user plane (that is, mobile stations) and service elements (for example, Wireless Application Protocol (WAP) Gateway) located beyond the Gi reference point.