This paper introduces the new Japanese academic backbone network called SINET3, which has been in full-scale
operation since June 2007. SINET3 provides a wide variety of network services, such as multi-layer transfer, enriched
VPN, enhanced QoS, and layer-1 bandwidth on demand (BoD) services to create an innovative and prolific science
infrastructure for more than 700 universities and research institutions. The network applies an advanced hybrid network
architecture composed of 75 layer-1 switches and 12 high-performance IP routers to accommodate such diversified
services in a single network platform, and provides sufficient bandwidth using Japan's first STM256 (40 Gbps) lines.
The network adopts lots of the latest networking technologies, such as next-generation SDH (VCAT/GFP/LCAS),
GMPLS, advanced MPLS, and logical-router technologies, for high network convergence, flexible resource assignment,
and high service availability. This paper covers the network services, network design, and networking technologies of
The rapid and aggressive penetration of broadband access services such as fiber to the home (FTTH) has been accelerating the increase in IP traffic volume and new networking technologies are required in order to accommodate future traffic in a cost-effective manner. This paper overviews the advanced IP optical network architecture and technologies for very-large-scale IP backbone networks. These technologies are the key to accommodate the huge volumes of IP traffic expected and control network resources in an effective and dynamic manner. We describe advanced IP optical networking technologies which accommodate multiple service networks using multi-instance technologies, and enable multi-layer traffic engineering using virtual network topology technologies. The migration scenario is described from the existing networks to GMPLS networks; reference is made to the advanced Path Computation Element (PCE) which enables multi-layer traffic engineering and MPLS/GMPLS migration. New network concepts such as Layer 1 Virtual Private Network (L1VPN) and GMPLS interoperability issues, which are being discussed in IETF, are also described.
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.,
Conference Committee Involvement (3)
Network Architectures, Management, and Applications
2 November 2007 | Wuhan, China
Network Architecture, Management, and Applications IV
5 September 2006 | Gwangju, South Korea
Network Architectures, Management, and Applications III