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Dhruv Dhody, Adrian Farrel, Zhenbin Li
The Path Computation Element (PCE) is a functional component capable of selecting
paths through a traffic engineering (TE) 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.
This document 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 include the creation, update, and withdrawal of Flow
Specifications via PCEP and can be applied to tunnels initiated by the PCE or to tunnels where
control is delegated to the PCE by the Path Computation Client (PCC).
Furthermore, a PCC requesting a new path can include
Flow Specifications in the request to indicate the purpose of the tunnel allowing the PCE to factor this into the path computation.
RFC 9168: Path Computation Element Communication Protocol (PCEP) Extension for Flow Specification
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