Xirrus Wi-Fi Array XR4420 User Manual page 112

WDS links have a Host/Client relationship similar to the usual IAP/station
pattern for Arrays:

A WDS Client Link associates/authenticates to a host (target) Array in the
same way that a station associates to an IAP. The client side of the link
must be configured with the root MAC address of the target (host) Array.

A WDS Host Link acts like an IAP by allowing one WDS Client Link to
associate to it. An Array may have both client and host links.
WDS configuration is performed only on the client-side Array. See
page 305. Note that both Arrays must be configured with the same SSID name.
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Wi-Fi Array
"WDS" on
Installing the Wi-Fi Array