The future trend is to integrate a constantly increasing number of services in the GMPLS/ASON networks.
Some services have very high resilience requirements, while other services have lower ones. This scenario
calls for frameworks capable of provisioning for multiple services in a cost efficient manner. This article
proposes a differentiated-resilience provisioning scheme applied to the GMPLS/ASON networks, which is
expected to be the near- and long-term network technology thanks, among other things, to the great
bandwidth capacity offered by optical devices. Finally, a critical evaluation of the state-of-the-art and future
challenges facing operators and designers is given. Our numerical results show that the differentiated
resilience scenario has better performance than that of dedicated and shared protection and received
connections in the differentiated-resilience are 31% higher than that of shared protection and are 60% higher
than that of dedicated protection.
Network service support to ensure quality of service (QoS) is a key requirement for many applications, we
present a novel management plane oriented service architecture which provides network resource scheduling
service in large-scale GMPLS/ASON network environment based on the service level agreement(SLA)
conducted between service customers and service providers. It applies the updated service-oriented and
policy translation structure with excellent expansibility and efficiency in the running process. The architecture
contains four components: Application Monitor Service, SLA Management, Policy management and Service
management. In addition, vertical service mapping and differentiated-resilience provisioning schemes of
service level agreement(SLA) applied to the GMPLS/ASON networks are discussed, which is expected to be
the near- and long-term network technology thanks, among other things, to the great bandwidth capacity
offered by optical devices.
Today, as networks grow rapidly in size, hierarchical network structures (e.g. PNNI) have been proposed to solve the problem of network scalability as well as security in large networks. One of the most important requirements of hierarchical networks is survivability. In this paper, we first present a survey on some restoration schemes, and then propose a hierarchical hybrid restoration scheme (HHRS) for hierarchical networks. The performance of these restoration schemes in hierarchical networks is analyzed and compared theoretically. Restoration success rate, restoration time, fault notification message overheads are the major performance measures. HHRS can reduce the number of fault notification signal messages by sending notification signal messages vertically up and down the network hierarchy instead of horizontally along the paths. It can also maximize the restoration success rate with a fast restoration speed by dynamically determining the restoration scope.
A notification mechanism of topology information based on speaker node is proposed, which is aimed to realize
topology discovery, synchronization and routing computation in hierarchical ASON networks. The simulation shows that
with the increase of routing layers, the size of routing load and link state database are rapidly decreased. So the
mechanism can save the memory space of the node and improve the routing efficiency.
RSVP-TE Signaling involves transporting control messages between all entities communicating through an ASON's control plane and is used to create, maintain, restore, and release connections. Control plane restoration has not been studied in details in the literature except for using protection switching or the source-initiation mechanism. Such schemes take a big bandwidth waste or long restoration to the networks. We provide a fast restoration mechanism based on (extended) local restoration using RSVP-TE as the signaling. This mechanism can reduce the restoration time by the theoretical analyses.