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

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.

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

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