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Proceedings Paper

New methods for more effective use of bandwidth in MPLS networks with fast rerouting
Author(s): Yasuyuki Matsuoka; Takashi Kurimoto; Jun Nishikido; Shigeo Urushidani
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Paper Abstract

Multi-protocol label switching (MPLS) technology is useful for IP Virtual Private Networks (IP-VPNs), guaranteeing bandwidth in IP (Internet Protocol) networks, and carrying out traffic engineering with explicit routing. The advantage of MPLS is its high capability to achieve of reliable networks when used with Fast Rerouting. However, Fast Rerouting requires a lot of network resources. This is because, for the rapid recovery of end-to-end communications after detection of failures, secondary LSPs must already have been reserved as detours in case there are failures on primary node-to-node links. The sharing of bandwidth among secondary LSPs is thus significant as a way of reducing the usage of network resources when Fast Rerouting is applied. In this paper, we propose a new routing algorithm in which bandwidth is shared among the secondary LSPs for multiple primary LSPs. This algorithm produces efficient network-level LSP designs. Three approaches to the dynamical changing of Open Shortest Path First (OSPF) link-cost metrics are applied in the algorithm. Each approach improves efficiency in the sharing of LSPs. The approaches are (1) the broader distribution of primary LSPs to reduce the need for detours in cases of single failures, (2) the concentration of secondary LSPs on links to increase the possibilities for bandwidth sharing, and (3) the distribution of secondary LSPs that cater to a certain failure, thus increasing the numbers of detouring LSPs which are independent of each other on the respective links. The scheme provides a slight improvement over the results of the conventional Dijkstra-algorithm calculation which is used in conventional OSPF. The proposed algorithms are applied with various network models that have been proposed in IETF Internet drafts, e.g.,

Paper Details

Date Published: 9 September 2002
PDF: 9 pages
Proc. SPIE 4910, Optical Networking II, (9 September 2002); doi: 10.1117/12.482448
Show Author Affiliations
Yasuyuki Matsuoka, Nippon Telegraph and Telephone Corp. (Japan)
Takashi Kurimoto, Nippon Telegraph and Telephone Corp. (Japan)
Jun Nishikido, Nippon Telegraph and Telephone Corp. (Japan)
Shigeo Urushidani, Nippon Telegraph and Telephone Corp. (Japan)


Published in SPIE Proceedings Vol. 4910:
Optical Networking II
Shizhong Xie; Chunming Qiao; Yun Chur Chung, Editor(s)

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