Enhancing MPLS QoS routing algorithms by using the network protection degree paradigm

* This work has been partially supported by Special Action (Spanish Ministry Science and Technology)TIC2002-10150-E. AbstractIP based networks still do not have the required degree of reliability required by new multimedia services, achieving such reliability will be crucial in the success or failure of the new Internet generation. Most of existing schemes for QoS routing do not take into consideration parameters concerning the quality of the protection, such as packet loss or restoration time. In this paper, we define a new paradigm to develop new protection strategies for building reliable MPLS networks, based on what we have called the Network Protection Degree (NPD). This NPD consists of an a priori evaluation, the Failure Sensibility Degree (FSD), which provides the failure probability and an a posteriori evaluation, the Failure Impact Degree (FID), to determine the impact on the network in case of failure.