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A New Traffic Engineering Approach for IP Networks

MPLS has received considerable attention as a protocol for transporting IP packets while providing traffic engineering. It requires label distribution, which represents a significant overhead when processing connectionless traffic. This paper describes a new protocol called subIP which efficiently provides connectionless service to IP traffic while remaining the simplicity of MPLS packet forwarding. When used in conjunction with a concept called multiple topology routing, which allows multiple routes to be obtained using standard shortest path routing algorithms, it allows best effort traffic to be flexibly routed across a network domain.