Spanning tree is only needed when using wireless bridges. It should remain
disabled for access points and repeaters, unless special circumstances exist in
the network. The spanning-tree algorithm is used to prevent bridging loops. The
algorithm computes available network paths and closes redundant paths, so that
there is only one path between any pair of LANs on the network.
Improper
spanning tree settings can disable needed connections. From a security
perspective, an attacker may be able to disable ports in a poorly configured
network. Please review and understand spanning tree information when making
configuration decisions.