P-cycle Protection in multi-domain optical networks

Abstract

Providing resilient inter-domain connections in multi-domain optical GMPLS networks is a challenge. On the one hand, the integration of different GMPLS domains to run traffic engineering operations requires the development of a framework for inter-domain routing and control of connections, while keeping the internal structure and available resources of the domains undisclosed to the other operators. On the other hand, the definition of mechanisms to take advantage of such automatically switched inter-domain connectivity is still an open issue. This article focuses on the analysis of applicability of one of these mechanisms: p-cycle-based protection. The proposed solution is based on the decomposition of the multi-domain resilience problem into two sub-problems, namely, the higher level interdomain protection and the lower level intra-domain protection. Building a p-cycle at the higher level is accomplished by certain tasks at the lower level, including straddling link connection, capacity allocation and path selection. In this article, we present several methods to realize inter-domain p-cycle protection at both levels and we evaluate their performance in terms of availability and spent resources. A discussion on a proposal of implementation of signalling based on extensions of existing protocols such as RSVP-TE and the PCE architecture illustrates the practical viability of the approach.

A survey of survivability in multi-domain optical networks

“…In reference [8], the authors propose a solution for a multi-domain network protection based on p-cycles [9]. The main goal of this solution is to protect the interdomain links.…”

A Topology Aggregation Model for Survivability in Multi-Domain Optical Networks Using p-Cycles

“…The use of p-cycles for multi-domain networks protection is proposed and evaluated in [9]. In this section of the article, we explain the concept of p-cycles and its advantages.…”

“…In this section of the article, we explain the concept of p-cycles and its advantages. In addition, we describe the solution proposed in [9] and its limitations.…”

“…In order to overcome the afore-mentioned drawbacks, we propose to use p-cycles (pre-configured cycles) to protect multi-domain optical networks, and improve the existing solution proposed by A. Farkas and al, in [9]. An important property of p-cycles is that the cycles are fully preconfigured with pre-planned spare capacity and when a link fails, only the two end nodes of the failed link need to perform the recovery actions, and no switching actions are required at any intermediate nodes of the cycles.…”

“…In addition, we present a p-cycle based protection scheme proposed for multi-domain optical networks [9] and its limitation. In sections 3 and 4, we detail our solution and show the performance results.…”