User guide

4-31
WDS and Spanning Tree Settings
from that device to the root device. Then it selects a designated bridging device
from each LAN which incurs the lowest path cost when forwarding a packet from
that LAN to the root device. All ports connected to designated bridging devices
are assigned as designated ports. After determining the lowest cost spanning
tree, it enables all root ports and designated ports, and disables all other ports.
Network packets are therefore only forwarded between root ports and
designated ports, eliminating any possible network loops.
Once a stable network topology has been established, all bridges listen for Hello
BPDUs (Bridge Protocol Data Units) transmitted from the root bridge. If a bridge
does not get a Hello BPDU after a predefined interval (Maximum Age), the bridge
assumes that the link to the root bridge is down. This bridge will then initiate
negotiations with other bridges to reconfigure the network to reestablish a valid
network topology.
 Bridge – Enables/disables STP on the wireless bridge or repeater.
(Default:
Disabled)
 Bridge Priority – Used in selecting the root device, root port, and designated
port. The device with the highest priority becomes the STP root device.
However, if all devices have the same priority, the device with the lowest MAC
address will then become the root device. (Note that lower numeric values
indicate higher priority.)
• Range: 0-65535
• Default: 32768
 Bridge Max Age – The maximum time (in seconds) a device can wait without
receiving a configuration message before attempting to reconfigure. All device
ports (except for designated ports) should receive configuration messages at
regular intervals. Any port that ages out STP information (provided in the last
configuration message) becomes the designated port for the attached LAN. If
it is a root port, a new root port is selected from among the device ports
attached to the network. (Range: 6-40 seconds)
• Default: 20
• Minimum: The higher of 6 or [2 x (Hello Time + 1)].
• Maximum: The lower of 40 or [2 x (Forward Delay - 1)]
 Bridge Hello Time – Interval (in seconds) at which the root device transmits a
configuration message. (Range: 1-10 seconds)
• Default: 2
• Minimum: 1
• Maximum: The lower of 10 or [(Max. Message Age / 2) -1]