With ever increasing requirements posed by significant advances in networking, service providers may use traffic
engineering (TE) techniques to efficiently manage resources and provide consistent quality of service (QoS). Briefly,
constraint-based path computation involves the pruning of links that do not satisfy constraints and subsequently using the
shortest path algorithm on the resulting sub-graph. This process is simple and efficient when the path involves only one
domain, but can potentially become severely resource heavy, complex, and inefficient when multiple domains are
involved. To address this problem, the Path Computation Element (PCE) architecture has been proposed to allow multilayer
path computation to be simple and efficient. The PCE architecture introduces a special computational entity that
will cooperate with similar entities to compute the best possible path through multiple layers. This paper analyses the
PCE architecture and the traditional method to computing the routing through multiple layers, and then an improved
scheme of path selection for multi-layer network based on PCE and VNTM is present and evaluated on the simulation
platform of NSFNET, which is used to avoid traffic redundancy caused by low layer's invisibility to the high layer.
The complexity of optical networks has been researched and some complexity laws are described here. Then
some metrics from complex networks, such as mean path length, node's degree distribution and node's
clustering coefficient have been introduced into optical networks. The invulnerability in complex optical
networks is mainly researched in this paper.
Two methods of reservation namely ANIR (all nodes-initiated reservation) and MSR (multi-states reservation) are proposed and compared with SIR (source-initiated reservation) and DIR (destination-initiated reservation). The four methods of reservation are simulated in NSFNET and ARPA topologies. Numeric results show that the blocking probability of ANIR is lower than SIR, but the number of packages which it generates is larger, and the blocking probability of MSR is lower than DIR and SIR under light load.
Although Gigabit T-MPLS technology has not been widely used for transmission network, it is attracting more and more
attention. The design of high-speed data switching is the key technology in T-MPLS. In this paper, one method that
implements 4 ports Gigabit T-MPLS switch chip on FPGA which is used for TDM over T-MPLS exchanging is
introduced, and the simulation and verification results will be given in the conclusions. It researches the requirements of
transport plane in T-MPLS and analyses the architecture, and demonstrates a design of TDM in Transport MPLS based
on FPGA through a testbed which is used to explore and implement the concepts of Transport MPLS.
It researches the requirements of control plane in T-MPLS and analyses the architecture of control plane based on TMPLS
testbed. With the growth of the demand for packet transport services, packet transport network is becoming the
core technology for transport network, especially T-MPLS. Because of simply implement, independent control plane,
complete OAM, T-MPLS becomes the most promising technology for packet transport network. The control plane is
responsible for handling dynamically and in real-time network's esources in order to manage the establishment and
deletion of label switch path(LSP), and for disseminating and discovering network topology and resource availability
through the exchange of control (signaling and routing) messages between neighbor nodes over the data communication
network (DCN). It is composed of mainly four modules, connection controller (containing signaling module), routing,
resource manager, and protocol controller module. The four modules interact with each other to complete the control
plane's functions. The flow of every module is designed in this paper to complete control plane's software programming.
This paper introduces a novel method to design SNMP-based network management system of GE-PON and its
management applications. Then it introduces how to establish a web server on GE-PON NMS platform, and methods to
realize the system in the Manager and Agent. Finally, a simulation result is given to show the feasibility and superiority
of this method.