No abstract

In this paper, we propose four different RWA schemes which are introduced into the wavelength-routed intelligent optical networks. FSP+FF and FPLC+FF are traditional RWA schemes used in the centralized control environment. The other two schemes, FWR-4 and BWR-3, are distributed wavelength reservation protocols which invoke the GMPLS REVP-TE. These schemes are emulated in GMPLS-based NSFNET. The results are compared in terms of four performance metrics which are blocking probability (BP), route length (RL), setup time (ST) and control overhead (CO). Except for FWR-4, the BPs of the other three RWA schemes are similar, and in the case of lighter traffic load the BP of FPLC+FF is the smallest, but under heavier traffic load the BP of BWR-3 is the best. Because FPLC+FF does not always choose the shortest path compared with other RWA schemes using the shortest path routing algorithm, so its RL is the longest. The route and wavelength are determined by the source node, and the RL is shorter, therefore the lightpath setup in FSP+FF is the fastest among all schemes. In addition, the CO of FWR-4 is the fewest because it need not flood the routing information and retry. Though the four schemes respectively have their advantages, the performance of BWR-3 is outstanding among them if its ST can be accepted.

No abstract

No abstract

No abstract