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While an empty bonding interface has IFF_MASTER set, because it is a master interface and can accept slaves, bridge interface doesn't have IFF_MASTER. Tested with iproute2 and with libnl3.

Bridges don't get IFF_MASTER actually, that appears to only be used for bonds.  Bridges do get IFF_EBRIDGE, but that's a kernel-internal flag and not part of the userspace API.

jpirko: Feel free to close it.