Configuring MSTP
5-14 Configuring Spanning Trees
4. Displaytheedgeportadministrativestatusofoneormoreport(s):
show spantree adminedge[port port-string]
Astatusof“true”indicatestheportisadministrativelysettobeconsideredanedgeport.
Astatusof“false”indicatestheportisadministrativelysettobeconsideredanonedgeport.
Ifport‐stringisnotspecified,edgeportadministrativestatuswillbedisplayedfor allspanning
treeports.
5. If
necessary,changetheedgeportadministrativestatusofoneormoreport(s):
set spantree adminedge port-string true
Configuring MSTP
InorderforMSTPtoprovidemultipleforwardingpaths,thefollowing musthappen:
•Theconf igurationidentifiermustmatchonallbridgeswithintheregion.
•Allbridgesmustbewithinthesameregion.
•AllbridgesmustbeconnectedtoMSTP‐awarebridges.(Theycanbeconnectedusingashared
mediasuchasa
repeaterprovidedthatasinglespanningtreedevicedoesnotresideonthat
LAN).
ThissectionprovidesinformationaboutthefollowingMSTPtasks:
• SimpleMSTPConfigurat ion
• AdjustingMSTPParameters
• MonitoringMSTP
Simple MSTP Configuration
ThefollowingexampledescribessettingupthesimpleMSTPnetworkshowninFigure 5‐5.By
default,eachdevicewillbeinitsownMSTregionusingitsownMACaddressastheMST
configurationID.ThisconfigurationgroupsDevice1andDevice2intoasingleMSTregionwith
an
MSTIconfigurationnameof“South.”ItmapsVLAN2toMSTISID2andVLAN3toMSTI
SID 3.
Notes: A single spanning tree device between two MSTP bridges will terminate the ability to have
multiple forwarding paths.
An MSTP bridge connected to a repeater will use timers to change port states and rapid transition
will not occur. If the bridge must be connected to a repeater, adminpoint should be set to “true” on
those ports connected to the repeater. For more information, refer back to Defining Point-to-Point
Links on page 5-13.
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