Problem: A desktop computer takes nearly a minute to connect to a Cisco switch.  The switch model is c3750e

Reasons: 

• Spanning Tree Protocol (STP)
• EtherChannel negotiation
• Trunking negotiation
• Link speed/duplex negotiation between the switch and the workstation

These four features are listed in order of the delay they cause. STP causes the greatest delay and speed/duplex negotiation causes the least delay.

Solutions: Disable STP

Configuration

2900XL#configure terminal
2900XL(config)#interface g1/0/1
2900XL(config-if)#spanning-tree portfast
2900XL(config-if)#exit
2900XL(config)#exit
2900XL#copy run start