Specifications

Configuring and Managing STP Fast Convergence Features
RoamAbout Mobility System Software Configuration Guide 13-7
Changing the STP Maximum Age
Tochangethemaximumage,usethefollowingcommand:
set spantree maxage aging-time {all | vlan vlan-id}
Specifyanagefrom6through40 seconds.Thedefaultis20 seconds.
ThealloptionappliesthechangetoallVLANs.Alternatively,specifyanindividualVLAN.
Example
TochangethemaximumacceptableageforrootbridgehellopacketsonallVLANsto15 seconds,
typethefollowingcommand:
RBT-8100# set spantree maxage 15 all
success: change accepted.
Configuring and Managing STP Fast Convergence Features
ThestandardSTPtimersdelaytrafficforwardingbrieflyafteratopologychange.Thetimeaport
takestochangefromthelisteningstatetothelearningstateorfromthelearningstatetothe 
forwardingstateiscalledtheforwardingdelay.Insomeconfigurations,thisdelayisunnecessary.
TheRoamAboutSwitch
providesthefollowingfastconvergencefeaturestobypassthe 
forwardingdelay:
•Portfast
• Backbonefast
•Uplinkfast
Port Fast Convergence
Portfastconvergencebypassesboththelisteningandlearningstagesandimmediatelyplacesa
portintheforwardingstate.Youcanuseportfastconvergenceonportsthataredirectlyconnected
toservers,hosts,orotherMACstations.
Note: Do not use port fast convergence on ports connected to other bridges.