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How to configure a switch port so it immediately comes up when host is connected without waiting for spanning tree timers ?

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Question added by Osama Ismaeel , Customer Solutions Architect - VPO (VPN Owner) , Orange Business Services
Date Posted: 2015/11/22
khaja navaz
by khaja navaz , As a senior Engineer at expertise in TDM, VOIP Telecom & Network Engineer , Css Crop Pvt Ltd

spanning tree portfast gets immediately comes up.

commad is sw1(config-if)#spanning-tree portfast.

Enable the command spanning-tree portfast 

After a port on the switch has linked and joined the bridge group, STP runs on that port. A port that runs STP can be in one of five states:

 

  • blocking

  • listening

  • learning

  • forwarding

  • disabled

STP dictates that the port starts out blocking, and then immediately moves through the listening and learningphases. By default, the port spends approximately seconds listening and seconds learning 

*Never use the PortFast feature on switch ports that connect to other switches, hubs, or routers. These connections can cause physical loops.

Joy Marinas
by Joy Marinas , Senior Analyst , ANZ Bank

By adding the command "spanning-tree portfast" under the interface mode.. This feature is only enabled on switch ports that are facing hosts only.

udaya kumar
by udaya kumar , Solution Architect , CSC India Pvt Ltd

On the interface port enable the "Spanning Tree portfast" command

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