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I think you are referring to the M and the O flags in the router advertisement. How host OSes interpret these flags is off-topic here. Details the Router Advertisement Message format, including the RA flags:4.2. Router Advertisement Message FormatRouters send out Router Advertisement messages periodically, or inresponse to Router Solicitations.
M Series,MX Series,T Series,EX Series,PTX Series,QFabric System,OCX1100. Display information about IPv6 router advertisements, including statistics about messages sent and received on interfaces, and information received from advertisements from other routers. Windows 8.1 configures IPv6 address from DHCPv6, despite the fact that the Management flag (M) in the Router Advertisement is not set. If both SLAAC and DHCPv6 provide RDNSS information and M/A/O flags are set, Fedora, Centos and OS X configure RDNSS information from both sources, Ubuntu only from the RAs, and Windows only from DHCPv6.