Distributed Grooming in Multi-Domain IP/MPLS-DWDM Networks

Abstract

This paper studies distributed multi-domain, multilayer provisioning (grooming) in IP/MPLS-DWDM networks. Although many multi-domain studies have emerged over the years, these have primarily considered "homogeneous" network layers. Meanwhile, most grooming studies have assumed idealized settings with "global" link state across all layers. Hence there is a critical need to develop practical distributed grooming schemes for real-world networks consisting of multiple domains and technology layers. Along these lines, a detailed hierarchical framework is proposed to implement inter-layer routing, distributed grooming, and setup signaling. The performance of this solution is analyzed using simulation studies and future directions high-lighted.

Multi-domain traffic partition grooming in mixed granularity optical networks

“…While using the previous waveband switching based on ordinary multigranularity OXCs (MG-OXCs), the path is shown in Fig. 3(b), where the number of consumed ports is 14 (i.e., ports [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. We can see that our method can save four ports compared with the previous waveband switching based on the ordinary MG-OXCs in the example above.…”

“…Compared with single-hop traffic grooming where each demand only can be groomed into a single lightpath due to the lack of wavelength conversion, the multi-hop approach has a better lightpath utilization and a lower blocking rate [3][4][5]. More recently, most researchers focused on greening optical networks by traffic grooming [7][8][9][10][11][12][13][14][15][16][17].…”

“…The inter-domain routing is an interesting and challenging problem due to the lack of accurate global information, and it has gained more attentions in recent years [20,21]. The multidomain traffic grooming and the multi-domain waveband switching were also proposed [5,[22][23][24], while for a mixed granularity and multi-domain optical network, they still have their gra-diversity problems.…”

“…What is the meaning of gra-diversity problems? On one hand, the previous traffic grooming [2][3][4][5][6] multiplexes several demands into a single lightpath, and this technique has green footprint [7][8][9][10][11][12][13][14][15][16][17]. A lightpath is an optical path established between two nodes Contents lists available at ScienceDirect journal homepage: www.elsevier.com/locate/osn in the network, created by the allocation of the same wavelength throughout the path.…”

“…To ensure the scalability, the optical network has been divided into multiple domains [5,[20][21][22][23][24]. Each domain is a local automatic system managed by an independent vendor and only distributes partial information to others.…”