Fuzzy-CAC Driven MPLS-TE Realization

The Multiprotocol Label Switching – Traffic Engineering Extension (MPLS-TE) was introduced by the Internet Engineering Task Force (IETF) to ensure traffic engineering over MPLS. However, an actual Connection Admission Control (CAC) implementation inside the resource reservation protocol – traffic engineering extension (RSVP-TE) in MPLS-TE networks does not provide the ability of effective decision making, since the applied threshold CAC lacks of the capability to consider QoS policies on MPLS-TE network nodes. This prevents an effective end-to-end QoS control in a fully dynamic, application driven Label Switched Path (LSP) setup scenario. Current paper presents the practical fuzzy-CAC driven MPLS-TE realization, which is based on the specific implementation of fuzzy-CAC algorithm over an RSVP-TE agent. Fuzzy-CAC implementation is applied to a testbed where a client application requests a real-time data transfer through the MPLS-TE network, which results in dynamic LSP setup and exclusion. The admission control is performed upon service request based on QoS class requirements and network resource availability. The differentiated traffic treatment on per-flow basis is realized through employment of IF-THEN rule based expert knowledge. Effective traffic management is achieved in a best and worst case scenarios and thus, it validates fuzzy-CAC as a candidate for RSVP-TE protocol enhancement for application driven QoS provisioning in MPLS-TE networks and Generalized Multiprotocol Label Switching (GMPLS) networks in the nearest future