Huawei Technologies Old Dog Consulting Huawei Technologies The Path Computation Element (PCE) is a functional component capable of selecting paths through a traffic engineering network. These paths may be supplied in response to requests for computation, or may be unsolicited requests issued by the PCE to network elements. Both approaches use the PCE Communication Protocol (PCEP) to convey the details of the computed path. Traffic flows may be categorized and described using "Flow Specifications". RFC 8955 defines the Flow Specification and describes how Flow Specification Components are used to describe traffic flows. RFC 8955 also defines how Flow Specifications may be distributed in BGP to allow specific traffic flows to be associated with routes. RFC XXXX specifies a set of extensions to PCEP to support dissemination of Flow Specifications. This allows a PCE to indicate what traffic should be placed on each path that it is aware of. The extensions defined in this document extends the support for Ethernet Layer 2 (L2) and Layer 2 Virtual Private Network (L2VPN) traffic filtering rules either by themselves or in conjunction with L3 flowspecs. RFC Editor Note: Please replace XXXX in the Abstract with the RFC number assigned to draft-ietf-pce-pcep-flowspec when it is published. Please remove this note.