Integrated routing in GMPLS-based IP/WDM networks
- 126 Downloads
The Internet traffic evolution has forced network operators to migrate toward an integrated infrastructure which brings the IP and optical layers under a unified model. The integration between the two technologies has been facilitated by the development of the Generalized Multi Protocol Label Switching. In the integrated scenario, Multilayer Traffic Engineering can be reinforced with integrated routing techniques. Integrated IP/WDM routing facilitates the routing decision phase by allowing a node to have a complete knowledge of the IP and WDM domains when accommodating traffic. This study focuses on integrated IP/WDM routing. We analyze two basic policies widely discussed in literature: one policy prioritizes the traffic accommodation on the virtual topology, while the other prioritizes the traffic accommodation on the physical topology. We show that both the mechanisms do not lead to efficient resource utilization because they tend to congest one layer more than the other one. We propose an adaptive heuristic which combines the advantages of both the policies. When accommodating traffic, the proposed approach selects the appropriate layer depending on the resource utilization being experienced in the virtual and the physical topologies. We demonstrate via simulations that the cross-layer resource optimization executed by the proposed scheme achieves significant improvements in terms of blocking ratio.
KeywordsGMPLS Integrated IP/WDM routing Cross-layer resource optimization
Unable to display preview. Download preview PDF.
- 1.The value of OTN for network convergence and IP/Ethernet migration, Ciena White Paper. http://www.wwp.com/files/The_Value_of_OTN_for_Network_Convergence_A4_WP_new.pdf (2009)
- 2.Converge IP and DWDM layers in the core network, CISCO White Paper. http://www.cisco.com/en/US/prod/collateral/routers/ps5763/prod_white_paper0900aecd80395e03.pdf (2007)
- 3.Cisco Visual Networking Index—Forecast and Methodology, 2007–2012, CISCO White Paper. http://newsroom.cisco.com/dlls/2008/ekits/Cisco_Visual_Networking_Index_061608.pdf (2008)
- 7.INET Framework for OMNeT++/OMNEST. http://inet.omnetpp.org/doc/INET/neddoc/index.html
- 8.Katz, D., et al.: Traffic Engineering (TE) Extensions to OSPF Version 2, IETF RFC 3630 (2003)Google Scholar
- 9.Kodialam, M., et al.: Integrated dynamic IP and wavelength routing in IP over WDM networks. In: Proceedings of Twentieth Annual Joint Conference of the IEEE Computer and Communications Societies (INFOCOM), vol. 1, pp. 358–366, 2001Google Scholar
- 10.Mannie, E., et al.: Generalized multi-protocol label switching (GMPLS) architecture, RFC 3945 (2004)Google Scholar
- 13.OMNET++ version 4.0 user manual. http://www.omnetpp.org/doc/manual/usman.html
- 14.Salvadori, E., et al.: A traffic engineering scheme for QoS routing in G-MPLS networks based on transmission quality. In: Proceedings of the Eighth IFIP Working Conference on Optical Network Design and Modeling (ONDM), pp. 343–362, 2004Google Scholar
- 15.Puype, B., et al.: Optical cost metrics in multi-layer traffic engineering for IP-over-optical networks. In: Proceedings of the Sixth International Conference on Transparent Optical Networks (ICTON), pp. 75–80, 2004Google Scholar