Introduction One desirable application of Bidirectional Forwarding Detection (BFD) is to track the liveness of a Multiprotocol Label Switching (MPLS) Label Switched Path (LSP). In particular@ BFD can be used to detect a data plane failure in the forwarding path of an MPLS LSP. LSP Ping [RFC4379] is an existing mechanism for detecting MPLS LSP data plane failures and for verifying the MPLS LSP data plane against the control plane. This document describes the applicability of BFD in relation to LSP Ping for detecting MPLS LSP data plane failures. It also describes procedures for using BFD for detecting MPLS LSP data plane failures.