Specifications

WDS and STP
4-52 Advanced Configuration
• WDSBridgeallowsyoutospecifyuptoeightWDSbridgelinks(MACaddresses)perradio
interfaceforeachunitinthewirelessbridgenetwork.Oneunitmustbeconfiguredasthe
“rootbridge”inthewirelessnetwork.Therootbridgeistheunitconnectedtothemaincoreof
thewiredLAN.Otherbridgesneedtospecifyone“Parent”linktotherootbridgeortoa
bridgeconnectedtotherootbridge.TheothersevenWDSlinksareavailableas“Child”links
tootherbridges.
– BridgeRoleallowsyoutoseteachradiointerfacetooperateinoneof
thefollowingmodes:
(Default:AP)
‐ AP(AccessPoint)tooperateasanaccesspointforwirelessclients,providing
connectivitytoawiredLAN.
‐ Bridgetooperateasabridgetootheraccesspoints.The“Parent”linktotheroot
bridgemustbeconfigured.Uptosevenother”Child”linksare
availabletoother
bridges.
‐ RootBridgetooperateastherootbridgeinthewirelessbridgenetwork.Uptoeight
”Child”linksareavailabletootherbridgesinthenetwork.
– ChannelAutoSyncallowstheAPintheBridgemode(theʺChildʺAP)toautomatically
reconnectwithitsʺParentʺAP(or
theRoot‐Bridge)intheeventthateithertheʺChildʺor
theʺParentʺAPʹschannelischanged.Default:Disabled.
– BridgeParentisthephysicallayeraddressoftherootbridgeunitorthebridgeunit
connectedtotherootbridge.(12hexadecimaldigitsintheform“xx‐xx‐xx‐
xx‐xx‐xx”)
– BridgeChildisthephysicallayeraddressofotherbridgeunitsforwhichthisunitservesas
thebridgeparentortherootbridge.(12hexadecimaldigitsintheform“xx‐xx‐xx‐xx‐xx‐
xx”)
• SpanningTreeProtocolusesadistributedalgorithmtoselectabridgingdevice
(STP‐compliant
switch,bridgeorrouter)thatservesastherootofthespanningtreenetwork.Itselectsaroot
portoneachbridgingdevice(exceptfortherootdevice)whichincursthelowestpathcost
whenforwardingapacket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.Default:Disabled
– Bridge
Priorityis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: Note that lower numeric values indicate higher priority.