This proposal provides a technique to restructure a Flow Label into 4-bits of per‑flow flags and 16-bits of entropy within controlled domains. In various implementations, the flags may be used for performance information, Operations, Administration, and Maintenance (OAM), or the like. This proposal may allow providing a premium service on top of Internet Protocol version 6 (IPv6).
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Filsfils, Clarence; Camarillo, Pablo; Clad, Francois; and Abdelsalam, Ahmed, "STRUCTURED FLOW LABEL", Technical Disclosure Commons, (February 11, 2020)