![]() if administratively UP but all of its ports have operstate DOWN (usually: administratively DOWN or have the NO-CARRIER property) then the bridge interface gets the NO-CARRIER property and its operstate is DOWN (and for example with ignore_routes_with_linkdown=1, routes will have the dead/ linkdown properties).its operstate is UP if it's administratively UP and at least one of its bridge ports has operstate UP (usually: administratively UP and has carrier, ie: doesn't have the NO-CARRIER property).should it then lose all of its interfaces, its MAC address becomes 00:00:00:00:00:00, until a port is added back.each time a bridge port is added or removed the bridge interface dynamically inherits the lowest MAC address among all its bridge ports' MAC addresses.once at least one interface has ever been enslaved as bridge port:.until the first time an interface is set as bridge port, when administratively UP it gets a LOWER_UP flag and its operstate is UNKNOWN, which gives it the benefit of the doubt as if UP (eg with systl -w 0.ignore_routes_with_linkdown=1, route is working and doesn't have the linkdown property).it initially gets an autogenerated random MAC address with private bit set (ie: 2nd digit in MAC address' first byte is always 2,6,a or e).If the bridge has not be manually given a MAC address then Behavior might possibly have changed in the past depending on kernel version, but currently (here: kernel 5.17.x) it appears that:
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