Conclusion

Routing using the shortest path offered by IP networks represents a strong limitation in supporting the migration to all-IP. The various constraints of applications and services require the implementation of constrained paths via traffic engineering techniques. However, the distributed management mode of traffic engineering brings with it limitations from both a technical and a management point of view. The centralized architecture model, which introduces the notion of PCE, provides solutions to these limitations. Centralized computing makes it possible to perform optimization calculations not possible in distributed mode. The PCE also provides a solution for traffic engineering management, thanks to its central vision and the generally graphical interface available in market products.

However, the introduction of a PCE requires the introduction of the PCEP protocol...