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Overview of Spanning Tree Protocols
5-4 Configuring Spanning Trees
•Inadditiontousinghellotime,forwarddelay,andmaxageinformation,MSTPalsoutilizes
thehopcountforimprovedperformance.
MSTPcanautomaticallydete cttheversionofspanningtreebeingusedonaLANandsendoutthe
equivalenttypeofBPDU.Inaddition,MSTPincorporatesaforceversionfeature
wheretheuser
mayforceMSTPtobehaveasSTPorRSTP.
Common and Internal Spanning Tree (CIST)
MSTPusesallSTP,RSTPandMultipleSpanningTree(MST)regioninformationtocreateasingle
CommonandInternalSpanningTree(CIST)thatrepresentstheconnectivityoftheentirenetwork.
ThisisequivalenttothesinglespanningtreeusedforSTPandRSTP.
TheMSTPenablednetworkcontainsoneCISTand
aminimumofatleastoneMSTregion.A
typicalnetworkmaycontainnumerousMSTregionsaswellasseparateLANsegmentsrunning
legacySTPandRSTPspanningtreeprotocols.
TheCISTcontainsarootbridge,whichistherootofthespanningtreeforthenetwork.TheCIST
rootis
notnecessarilylocatedinsideanMSTregion.EachregioncontainsaCISTregionalroot,
unlesstheCISTrootispartoftheregion.
MST Region
AnMSTregionisagroupofdevicesthatareconfiguredtogethertoformalogicalregion.The
MSTregionpresentsitselftotherestofthenetworkasasingledevice,whichsimplifies
administration.Pathcostisonlyincrementedwhentrafficentersorleavestheregion,regardless
ofthenumber
ofdeviceswithintheregion.EachLANcanonlybeamemberofoneregion.
Figure 51showsthattheMSTregionappearsasasingledevicetoDevices1and2,butreally
consistsofthreedevices.
Figure 5-1 Example of an MST Region
ForadevicetobeconsideredaspartofanMSTregion,
itmustbeadministrativelyconfigured
withthesameconfigurationidentifierinforma tionasallotherdevicesintheMSTregion.The
configurationidentifierconsistsoffourseparateparts:
MST Region
Device 1 Device 2
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