1. IPv6 Transition Guide For A Large-scale Broadband Network Guo Liang Yang (Editor) Le Ming Hu Jin Yan Lin China Telecom Sept. 21 st, 2010 draft-yang-v4v6tran-ipv6-transition-guide-00

2. ► Metro Network: ► Backbone ► Subscriber Terminals ► Access Network ► Subscriber Terminals: ► Access Network: Introduction to A Large-scale Broadband Network draft-yang-v4v6tran-ipv6-transition-guide-00 China Telecom IP Backbone: ► High volume of traffic ► Devices is normally kept up-to-dated ► Cover a large area for long distance transmission MPLS Backbone ► Comparable low traffic ► For leased line and VPN customers ► Cover a large area for long distance ► Depends on different countries, some has hundreds of metro networks ► Typically two kinds of devices. Core (CR & AR) and BNG (BRAS) ► SRs are for contents’ or services’ accesses Internet IPv6 InternetIPv4 Internet Backbone Metro Area Network Access Network Customer Premises Network (100,000,000+) IP BackboneMPLS Backbone BRASService Router OLTDSLAM Routing mode CPEBridging mode CPE Aggregation Router Aggregation Switch ONT User End Core Router ► Metro Network:

3. Introduction to A Large-scale Broadband Network (cont.) draft-yang-v4v6tran-ipv6-transition-guide-00 China Telecom Access Network: ► Extremely large number of devices due to the subscriber scale ► Typically Layer 2 network ► IP aware due to ACLs or other security policies Internet IPv6 InternetIPv4 Internet Backbone Metro Area Network Access Network Customer Premises Network (100,000,000+) IP BackboneMPLS Backbone BRASService Router OLTDSLAM Routing mode CPEBridging mode CPE Aggregation Router Aggregation Switch ONT User End Core Router ► Subscriber Terminals: ► Most of subscribers’ OS in developing countries are Windows ® XP, which cannot support PPPoE dial-up in IPv6 environment. ► The CPEs are usually purchased by subscribers ► A considerable number of subscribers deployed a CPE with routing mode at home to share the broadband with serveral PCs ► Backbone: ► Metro Network: ► Access Network:

4. Internet Transition solutions For A Large-scale Broadband Network draft-yang-v4v6tran-ipv6-transition-guide-00 China Telecom Backbone: ► Existing IP Backbone  Dual-Stack xisting MPLS Backbone  6PE ► Building a new native IPv6 Backbone Metro Network: ► Existing MANs  Dual-Stack with new Dual-Stack BRAS ► Existing MANs  Dual-Stack with new IPv6-only BRAS ► Building new Dual-stack MANs ► Building new native IPv6 MANs Access Network: ► Existing devices  no changes, New added  IPv6 aware ► Existing devices  replace or upgrade, New added  IPv6 aware ► Existing devices  replace or upgrade, build a new IPv6 aware access network. IPv6 Internet IPv4 Internet Backbone Metro Area Network Access Network Customer Premises Network IP BackboneMPLS Backbone BRASService Router OLTDSLAM Routing mode CPEBridging mode CPE Aggregation Router Aggregation Switch ONT User End Core Router New IPv6 Backbone Dual stack CR & AR New BRAS Dual stack New BRAS IPv6 New Dual stack Metro Network New IPv6 Metro Network New Added devices MUST BE IPv6 Aware Historical devices No Changes MPLS with 6PE Historical devices Upgrade or replace New IPv6 Access Network for new users DS IP Backbone Internet IPv6 InternetIPv4 Internet Backbone Metro Area Network Access Network Customer Premises Network IP BackboneMPLS Backbone BRASService Router OLTDSLAM Routing mode CPEBridging mode CPE Aggregation Router Aggregation Switch ONT User End Core Router

5. Transition solutions For A Large-scale Broadband Network (cont.) draft-yang-v4v6tran-ipv6-transition-guide-00 China Telecom Access Mode: ► Existing MANs  Dual-Stack with new Dual-Stack BRAS DS host  DS BRAS DS host  v4 BRAS-[L2TP]-DS BRAS DS host + 6RD CPE  v4 BRAS  6RD GW + NAT44 CGN ► Existing MANs  Dual-Stack with new IPv6-only BRAS DS host  v6 BRAS-[L2TP]-DS BRAS DS host  DS-Lite CPE  v6 BRAS  DS-Lite LSN ► Building new Dual-stack MANs ► Building new native IPv6 MANs v6-only host  v6 BRAS  NAT64 (stateful/stateless) Internet IPv6 InternetIPv4 Internet Backbone Metro Area Network Access Network Customer Premises Network IP BackboneMPLS Backbone BRASService Router OLTDSLAM Bridging mode CPE Aggregation Router Aggregation Switch ONT Core Router PPPoE L2TP Routing mode CPE Historical V4 BRAS PPPoE Dual stack BRAS NAT44 LSN Dual stack New IPv6 BRAS PPPoE Dual stack BRAS User End Dual stack DS-Lite CPE DS-Lite LSN L2TP 6rd Gateway NAT44 LSN PPPoE 6rd CPE New IPv6 Core Dual stack BRAS New DualStack Metro Network Existing V4 BRAS Existing Metro Network 6rd Gateway NAT44 LSN PPPoE NAT64 6rd CPE Internet IPv6 InternetIPv4 Internet Backbone Metro Area Network Access Network Customer Premises Network IP BackboneMPLS Backbone BRASService Router OLTDSLAM Routing mode CPEBridging mode CPE Aggregation Router Aggregation Switch ONT User End Core Router

6. Thank you China Telecom Sept. 21 st, 2010 Questions? Contacts: GuoLiang Yang yanggl@gsta.com Jin Yan Lin jasonlin.gz@gmail.com