Enterasys Matrix DFE-Gold Series User Manual

Configuring Spanning Tree Bridge Parameters
Enterasys Matrix DFE-Gold Series Configuration Guide 6-3
•Disablingaportbasedonfrequencyoffailureevents
PortforwardingstateinthedesignatedportisgatedbyatimerthatissetuponBPDUreception.It
isanalogoustothercvdInfoWhiletimertheportuseswhenreceivingrootinformationintheroot/
alternate/backuprole.
Therearetwooperationalmodesfor
LoopProtectonaport.Iftheportisconnectedtoadevi ce
knowntoimplementLoopProtect,itusesfullfunctionalmode.Otherwisetheportoperatesin
limitedfunctionalmode.
ConnectiontoaLoopProtectswitchguaranteesthatthealternateagreementmechanismis
implemented.Thismeansthedesignatedport
canrelyonreceivingaresponsetoitsproposal
regardlessoftheroleoftheconnectedport,whichhastwoimportantimplications.First,the
designatedportconnectedtoanon‐rootportmaytransitiontoforwarding.Second,thereisno
ambiguitywhenatimeouthappens;aLoopProtecteventhasoccurred.

Infullfunctionalmode,whenatype2BPDUisreceivedandtheportisdesignatedandpoint‐to‐
point,thetimerissetto3timeshelloTime.Inlimitedfunctionalmodethereistheadditional
requirementthattheflagsfieldindicatearootrole.Iftheportisa
boundaryporttheMSTIsfor
thatportfollowtheCIST,thatis,theMSTIporttimersaresetaccordingtotheCISTporttimer.If
theportisinternaltotheregionthentheMSTIporttimersaresetindependentlyusingthe
particularMSTImessage.
Messageageexpirationandtheexpiration
oftheLoopProtecttimerarebothLoopProtectevents.
Anoticelevelsyslogmessageisproducedforeachsuchevent.Trapsmaybeconfiguredtoreport
theseeventsaswell.AsyslogmessageandtrapmaybeconfiguredfordisputedBPDUs.
Itisalsoconfigura bletoforcethelockingof
aSID/portfortheoccurrenceofoneormoreevents.
Whentheconfigurednumberofeventshappenwithinagivenwindowoftime,theportisforced
intoblockingandheldthereuntilitismanuallyunlockedviamanagement.
Configuring Spanning Tree Bridge Parameters
Purpose
TodisplayandsetSpanningTreebridgeparameters,includingdevicepriorities,hellotime,
maximumwaittime,forwarddelay,pathcost,andtopologychangetrapsuppression.
Commands
Note: Spanning Tree configuration should be performed only by personnel who are very
knowledgeable about Spanning Trees and the configuration of the Spanning Tree Algorithm.
Otherwise, the proper operation of the network could be at risk.
Note: The term “bridge” is used as an equivalent to the term “switch” or “device” in this document.
For information about... Refer to page...
show spantree stats 6-6
show spantree version 6-9
set spantree version 6-9

Enterasys Matrix DFE-Gold Series Specifications

General

Brand	Enterasys
Model	Matrix DFE-Gold Series
Category	Switch
Language	English