Engineering end-to-end IP resilience using resilience-differentiated QoS

Abstract

Network resilience is becoming a key issue in the design of IP-based multimedia and multiservice networks. The current discussion about IP network resilience centers around MPLSbased recovery mechanisms. Any well designed recovery strategy has to take into account the different resilience requirements of the single traffic flows in order to avoid excessive usage of bandwidth for standby links. Faced with multiple recovery options, an ISP or NSP must decide which flows to protect to what extent against network failures. In this article an extension to existing Quality of Service (QoS) architectures is presented that integrates the signaling of resilience requirements with the traditional QoS signaling. We refer to this extended QoS model as Resilience-Differentiated QoS (RD-QoS). At the border of MPLS domains, the resilience requirements can then be directly mapped to the appropriate MPLS recovery options. A traffic engineering process for the provisioning of the resilience classes is introduced, and a case study demonstrates the significant network capacity savings achievable via this approach.

Reliable anycast and unicast routing: protection against attacks

“…for each h ∈ A 3 The respective constraints for backup paths of anycast downstream demands may be obtained from (8) by replacing x r,h and z r,h by y r,h and v r,h , accordingly. 4 Equations for backup paths of anycast upstream demands are similar to (9) with x r,h and z r,h replaced by y r,h and v r,h , accordingly.…”

“…Therefore, network survivability being the ability to provide the continuous service in the presence of failures [2,3,21] is one of the most important aspects of network design. According to [12], failures of single links are most probable.…”

Protection performance components in MPLS networks

“…[9], that attempt to relate what the QoS parameters of each DS traffic class are. However, there are very few proposals that relate what the protection parameters are in relation to each traffic class.…”

Restorability enhancement and service-oriented protection in radio access networks

“…The service classes in [9] focus on the networkspecific QoS requirements, whereas the proposed model considers both network and application-specific needs, consumer distribution and revenue, and addresses the need for RAN topology enhancement.…”

“…Article [9] presents a Resilience-Differentiated QoS architecture integrating the signaling of the resilience requirements with the traditional QoS signaling of IP services. The service classes in [9] focus on the networkspecific QoS requirements, whereas the proposed model considers both network and application-specific needs, consumer distribution and revenue, and addresses the need for RAN topology enhancement.…”