Scenarios and Deployment Strategies of Path Computation Element for Inter-AS MPLS-TE

A.S. Mohamad (Malaysia) and S. Asano (Japan)

Keywords

PCE, Traffic Engineering, InterAS

Abstract

Nowadays, Multiprotocol Label Switching (MPLS) is used inside Autonomous Systems (ASs) for Traffic Engineering (TE) or Virtual Private Networks (VPNs) purposes. The need for inter-AS Label Switched Paths (LSPs) is growing, as carries and Service Providers (SPs) build multi-services network based on MPLS-enabled infrastructures. It becomes a key issue to extend the ability to deliver these services across SP domain boundaries. In this paper, we discuss the requirements for the inter-AS MPLS-TE. We also summarize the Path Computation Element (PCE) architecture. Then we explain the approaches of using a PCE for the LSP path computation in inter-AS MPLS-TE. To illustrate our point, we compare two LSP path computation techniques.

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