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08a26ecc47
Since linux commit a35ec8e38cdd1766f29924ca391a01de20163931 ("bridge:
Add MAC Authentication Bypass (MAB) support"), included since v6.2, it
is possible to enable MAC Authentication Bypass for bridge ports. In
this mode the locked port learns again, but the learned fdb entries are
locked, allowing user space to unlock hosts based seen MAC addresses.
This requires learning to be enabled on the port, and link-local
learning disabled for the bridge.
Add support to systemd-network for setting the new attribute for bridge
ports.