Failures in the GMPLS (Generalized Multi-Protocol Label Switching) control plane and in the data plane may
independently occur. The established data plane connections such as lightpaths in WDM networks must remain
operational in the event of a control plane failure. A control plane failure should not cause changes of the state of
connections and resources in the data plane. In addition, the control plane needs to recover the lost state information, or
acquire up-to-date state information. The engineering of GMPLS control plane failure recovery techniques must consider
different failure scenarios, co-ordinations of different recovery mechanisms. In this paper, we summarize the graceful
restart mechanism for the signalling protocols, then present a two-step failure recovery of the signalling protocols to
improve the recover speed.
The Layer 1 Virtual Private Network (L1VPN) technology supports multiple user networks over a common carrier
transport network. We present an L1VPN management architecture where network providers manage physical network
infrastructures, service providers manage L1VPN services by composing individual network resources into L1VPNs,
end users invoke L1VPN management services to configure operational L1VPNs. Using a Service-Oriented Architecture
(SOA) and Web Services (WS), we implemented an L1VPN management tool, called User Controlled Light Paths
(UCLP). Network providers use the tool to partition resources at the L1VPN level by assigning resources, together with
the WS based management services for the resources, to service providers. Service providers use the tool to receive
resource partitions from multiple network providers and partner service providers. Further resource partitioning or re-grouping
can be conducted on the received resources, and leasing or trading resources with partner service providers is
supported. After the service providers compose the use scenarios of resources, and make the use scenarios available to
the L1VPN end users as WS, the end users reconfigure the L1VPN without intervention of either network or service
providers.
Fixed routing is favoured because it simplifies physical layer engineering, such as link budget calculations. The use of the fixed routing scheme can achieve fast bandwidth provisioning at the expense of inferior network blocking performance and lack of adaptability to traffic variation. In this paper, a load-balanced fixed routing scheme is proposed. For each source-destination pair, it assigns a fixed path such that the load-balancing requirement is met. This scheme is formulated into an Integer Linear Programming process. Both simulation and analytical methods are used to verify the effectiveness of the proposed planning algorithm. We also modify an analytical model of blocking probability by considering the load-balancing characteristic.
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