http://www.rfc-editor.org/rfc/rfc7777.txt
RFC 7777: Advertising Node Administrative Tags in OSPF, S. Hegde, R. Shakir, A. Smirnov, Z. Li, B. Decraene2016-03-01T23:00:00-00:00This document describes the protocol extensions to disseminate node administrative tags to the OSPFv2 and OSPFv3 protocol. It provides example use cases of administrative node tags.