PCE stands for Path Computation Element. It's an entity, often a server or network device, within a network that is capable of computing paths for traffic engineering purposes, typically in MPLS (Multiprotocol Label Switching) or GMPLS (Generalized Multiprotocol Label Switching) networks. PCEs are used to calculate optimal paths for services based on various constraints, such as bandwidth, latency, and cost, allowing for more efficient network resource utilization and improved service delivery.
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