RFC 3717 IP over Optical Networks: A Framework March 2004 Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3 2. Terminology and Concepts . . . . . . . . . . . . . . . . . . . 4 3. The Network Model. . . . . . . . . . . . . . . . . . . . . . . 8 3.1. Network Interconnection. . . . . . . . . . . . . . . . . 8 3.2. Control Structure. . . . . . . . . . . . . . . . . . . . 11 4. IP over Optical Service Models and Requirements. . . . . . . . 13 4.1. Domain Services Model. . . . . . . . . . . . . . . . . . 13 4.2. Unified Service Model. . . . . . . . . . . . . . . . . . 14 4.3. Which Service Model? . . . . . . . . . . . . . . . . . . 15 4.4. What are the Possible Services?. . . . . . . . . . . . . 16 5. IP transport over Optical Networks . . . . . . . . . . . . . . 16 5.1. Interconnection Models . . . . . . . . . . . . . . . . . 17 5.2. Routing Approaches . . . . . . . . . . . . . . . . . . . 18 5.3. Signaling-Related. . . . . . . . . . . . . . . . . . . . 21 5.4. End-to-End Protection Models . . . . . . . . . . . . . . 23 6. IP-based Optical Control Plane Issues. . . . . . . . . . . . . 25 6.1. Addressing . . . . . . . . . . . . . . . . . . . . . . . 25 6.2. Neighbor Discovery . . . . . . . . . . . . . . . . . . . 27 6.3. Topology Discovery . . . . . . . . . . . . . . . . . . . 28 6.4. Protection and Restoration Models. . . . . . . . . . . . 29 6.5. Route Computation. . . . . . . . . . . . . . . . . . . . 30 6.6. Signaling Issues . . . . . . . . . . . . . . . . . . . . 32 6.7. Optical Internetworking. . . . . . . . . . . . . . . . . 34 7. Other Issues . . . . . . . . . . . . . . . . . . . . . . . . . 35 7.1. WDM and TDM in the Same Network. . . . . . . . . . . . . 35 7.2. Wavelength Conversion. . . . . . . . . . . . . . . . . . 36 7.3. Service Provider Peering Points. . . . . . . . . . . . . 36 7.4. Rate of Lightpath Set-Up . . . . . . . . . . . . . . . . 36 7.5. Distributed vs. Centralized Provisioning . . . . . . . . 37 7.6. Optical Networks with Additional Configurable Components . . . . . . . . . . . . . . . . . . . . . . . 38 7.7. Optical Networks with Limited Wavelength Conversion Capability . . . . . . . . . . . . . . . . . . . . . . . 38 8. Evolution Path for IP over Optical Architecture. . . . . . . . 39 9. Security Considerations. . . . . . . . . . . . . . . . . . . . 41 9.1. General Security Aspects . . . . . . . . . . . . . . . . 42 9.2. Security Considerations for Protocol Mechanisms. . . . . 43 10. Summary and Conclusions. . . . . . . . . . . . . . . . . . . . 44 11. Informative References . . . . . . . . . . . . . . . . . . . . 44 12. Acknowledgments. . . . . . . . . . . . . . . . . . . . . . . . 45 13. Contributors . . . . . . . . . . . . . . . . . . . . . . . . . 46 14. Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . 47 15. Full Copyright Statement . . . . . . . . . . . . . . . . . . . 48 Rajagopalan, et al. Informational