T010200062A0801MSWE.doc - ITU-T Recommendation...

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ITU-T Recommendation Y.2053 (formerly Y.iptv6transit) Functional Requirements for IPv6 Migration in NGN Summary Recommendation Y.ipv6transit provides feasible IPv6 migration scenarios and functional requirements necessary for them. Keywords NGN, Migration, IPv4, IPv6 Table of Contents 1. Scope 3 2. References 3 3. Definitions 3 3.1. Terms defined elsewhere ........................................................................................................................ 3 3.1.1. host [ITU-T Y.1540] ................................................................................................................. 3 3.1.2. router [ITU-T Y.1540] ................................................................................................................. 4 3.1.3. dual IP layer [IETF RFC 4213] ................................................................................................................. 4 3.1.4. configured tunnelling [IETF RFC 4213] ................................................................................................................. 4 3.2. Terms defined in this recommendation ........................................................................................................................ 4 3.2.1. node ................................................................................................................. 4 3.2.2. subnet ................................................................................................................. 4
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- 2 - 4. Abbreviations and acronyms 4 5. Conventions 4 5.1. native IPv6 device ........................................................................................................................ 4 5.2. IPv6 transition mechanism ........................................................................................................................ 4 5.3. basic IPv6 transition mechanisms ........................................................................................................................ 4 6. Introduction - IP as transport function of NGN 5 7. Basic approaches for interworking and migration 5 7.1. Dual IP layer (Dual Stack) ........................................................................................................................ 5 7.2. Configured tunnelling ........................................................................................................................ 5 7.3. Network address translation and protocol translation ........................................................................................................................ 6 8. Migration scenarios with role of functional elements 6 8.1. CASE 1 ~ 3 (NAT-PT cases) ........................................................................................................................ 7 8.2. CASE 4 ~ 7 (configured tunnelling cases) ........................................................................................................................ 8 8.3. CASE 8 (NAT-PT case) ........................................................................................................................ 8 8.4. CASE 9 (configured tunnelling cases) ........................................................................................................................ 9 8.5. CASE 10 ~ 11 (dual stack cases) ........................................................................................................................ 9
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- 3 - 8.6. CASE 12 (native IPv6 case) ........................................................................................................................ 9 9. Functional requirements for IPv6 migration at transport stratum 9 9.1. Transport stratum functions ........................................................................................................................ 9 9.1.1. Transport functions ................................................................................................................. 10 9.1.2. Transport control functions ................................................................................................................. 13 9.2. End-User Functions ........................................................................................................................ 14 9.2.1. Terminal ................................................................................................................. 14 9.2.2. Customer Network ................................................................................................................. 14 9.3. Other Non-NGN network functions ........................................................................................................................ 14 10. Security Considerations 14 Appendix I: IPv6 Migrations in NGN 15 I.1. IPv6 transition mechanisms ........................................................................................................................ 15 I.2. Example migration scenarios according to Table 1 ........................................................................................................................ 17
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- 4 - ITU-T Recommendation Y.2053 (formerly Y.iptv6transit) Functional Requirements for IPv6 Migration in NGN 1. Scope The objective of this recommendation is to identify IPv6 migration scenarios and functional requirements necessary for them. NGN transport stratum provides IP connectivity services to NGN users, but the current NGN assumes no specific version of IP. It means that IPv4 and IPv6 could co-exist in NGN while IPv4 is being replaced with IPv6. So the interim solution like IPv6 transition mechanism (see section 6 and 7) is required for this period. If the IPv6 transition mechanism is introduced to NGN, there could be various migration scenarios satisfying various application’s requirements or service provider’s requirements, and these migration scenarios will also impact on existing FEs of NGN. Thus, this recommendation provides feasible IPv6 migration scenarios, and functional requirements required to support each scenario. 2. References The following ITU-T Recommendations and other references contain provisions, which, through reference in this text, constitute provisions of this Recommendation. At the time of publication, the editions indicated were valid. All Recommendations and other references are subject to revision; users of this Recommendation are therefore encouraged to investigate the possibility of applying the most recent edition of the Recommendations and other references listed below. A list of the currently valid ITU-T Recommendations is regularly published.
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  • Spring '13
  • L
  • IP address, IPv6 migration

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