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One of the major issues for telecom operators today is how to rapidly identify the cause of failure and affected services within a multi-layer and multi-domain network to achieve high-quality service on an end-to-end basis. To assess this issue, this paper describes a real-time root cause analysis mechanism, which can pinpoint an accurate root cause and identify the influence on services. We investigated...
This paper proposes a network architecture to achieve a QoS assured network, which is composed of two QoS control technologies such as IP flow control and MPLS DiffServ-TE. IP flow control technology is utilized to treat IP packets as an IP flow distinguished by source and destination IP addresses, ports, protocol and priority and to apply the CAC function on the per- flow basis. MPLS DiffServ-TE...
This paper describes a multi-layer network management system for an IP/MPLS/GMPLS network, which provides integrated control and management from a packet to a lambda, even under a multi-vendor environment. The developed proto-type NMS successfully demonstrated such integrated topology management and hierarchical resource management of IP flow, MPLS LSPs and GMPLS LSPs. In addition, targeting the effective...
Optical PCE and its interwork with the NMS were investigated for planning and operation of optical transparent networks. We successfully verified effective and fast optical-path computation taking into account the physical impairments and wavelength continuity.
A multi-area MPLS/GMPLS interoperability trial was successfully conducted using various types of network elements from 14 vendors for the first time. The results show that the interior gateway routing protocol based multi-area routing architecture is a promising solution to achieve nationwide deployment of GMPLS networks within a carrier domain.
A multi-layer NMS was successfully developed to manage the optical network and the MPLS network. The integrated network-planning tool could appropriately provide the optimized routes for a new LSP and all the existing LSPs.
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