Specifications

Changing Standard Spanning Tree Parameters
13-6 Configuring and Managing Spanning Tree Protocol
Resetting the STP Port Priority to the Default Value
ToresettheSTPportprioritytothedefaultvalue,useoneofthefollowingcommands:
clear spantree portpri port-list
clear spantree portvlanpri port-list {all | vlan vlan-id}
Thecommandappliesonlytotheportsyouspecify.Theportcostonotherportsremains
unchanged.
Changing Spanning Tree Timers
YoucanchangethefollowingSTPtimers:
•Hellointerval—TheintervalbetweenconfigurationmessagessentbyaRoamAboutSwitch
whentheswitchisactingastherootbridge.Youcanspecifyanintervalfrom1through10
seconds.Thedefaultis2seconds.
•Forwardingdelay—Theperiodoftimeabridgeotherthanthe
rootbridgewaitsafter
receivingatopologychangenotification tobeginforwardingdatapackets.Youcan specifya
delayfrom4through30seconds.Thedefaultis15seconds.(Therootbridgealwaysforwards
traffic.)
•Maximumage—TheperiodoftimethataRoamAboutSwitchactingasadesignatedbridge
waitsfor
anewhellopacketfromtherootbridgebeforedeterminingthattherootbridgeisno
longeravailableandinitiatingatopologychange.Youcanspecifyanagefrom6through40
seconds.Thedefaultis20seconds.
Changing the STP Hello Interval
Tochangethehellointerval,usethefollowingcommand:
set spantree hello interval {all | vlan vlan-id}
Specifyanintervalfrom1through10seconds.Thedefaultis2seconds.
ThealloptionappliesthechangetoallVLANs.Alternatively,specifyanindividualVLAN.
Example
TochangethehellointervalforallVLANsto4 seconds,typethefollowingcommand:
RBT-8100# set spantree hello 4 all
success: change accepted.
Changing the STP Forwarding Delay
Tochangetheforwardingdelay,usethefollowingcommand:
set spantree fwddelay delay {all | vlan vlan-id}
Specifyadelayfrom4through30seconds.Thedefaultis15 seconds.
ThealloptionappliesthechangetoallVLANs.Alternatively,specifyanindividualVLAN.
Example
TochangetheforwardingdelayonVLANpinkto20 seconds,typethefollowingcommand:
RBT-8100# set spantree fwddelay 20 vlan pink
success: change accepted.