SMC Networks ElliteConnect 2.4GHz/5GHz - Manual (Page 119)

Advanced Configuration
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Wireless Distribution System (WDS)
The IEEE 802.11 standard defines a WIreless Distribution
System (WDS) for connections between wireless bridges. The
access point uses WDS to forward traffic on bridge links between
units. When using WDS, only wireless bridge units can associate
to each other using the bridge band. A wireless client cannot
associate with the access point on the wireless bridge band.
To set up a wireless bridge link, you must configure the WDS
forwarding table by specifying the Ethernet MAC Address of the
bridge to which you want to forward traffic. For a Slave bridge
unit, you need to specify the MAC address of the wireless bridge
unit at the opposite end of the link. For a Master bridge unit, you
need to specify the MAC addresses of all the Slave bridge units in
the network. When trying to connect to other bridges, please
input the Ethernet MAC Address.