Extreme Networks Summit WM User Manual page 219

NOTE
It is recommended to limit the number of APs participating in a WDS tree to 8. This limit guarantees decent
performance in most typical situations.
NOTE
If an Altitude AP is configured to serve as a scanner in Summit WM series Spy, it cannot be used in a WDS tree.
For more information, see Chapter 9, "Working with the Summit WM series Spy."
Radio Channels
The radio channel on which the child Altitude AP operates is determined by the parent Altitude AP.
An Altitude AP may connect to its parent Altitude AP and children Altitude APs on the same radio, or
on different radios. Similarly, an Altitude AP can have two children operating on two different radios.
NOTE
When an Altitude AP is connecting to its parent Altitude AP and children APs on the same radio, it uses the same
channel for both the connections.
Multi-root WDS topology
A WDS topology can have multiple Root Altitude APs.
Figure 18 illustrates the multiple-root WDS topology.
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