doubt about spanning-tree portfast trunk

[jg404]

Hey!

I have a doubt with the command "spanning-tree portfast trunk" 

I saw this on a config:

interface FastEthernet0/37
switchport mode access
switchport voice vlan 20
spanning-tree portfast trunk

Is this configuration possible? Because the port is declared as access mode but its spanning tree portfast as trunk

[Flavio Miranda]

@jg404 

 From what I know this is totally wrong. First, or you put one port in access or in trunk.  This is the first mistake. 

Second, trunk is meant to connect two network devices and should not have port fast. Port Fast is meant for end point device like PCs and Servers. 

 When you set port fast in a port, you are not expecting BPDU on that port and this will speed up the process to turn the port UP in case it flaps.

But, in a trunk you need to have BPDU for spanning-tree convergence and loop avoidance. 

[MHM Cisco World]

I don't try but config voice vlan with data vlan in interface this interface is run as mini trunk and hence portfast trunk I think work yes 

MHM

[Reza Sharifi]

The port is an access port. So, the command "spanning-tree portfast trunk" will not have any effect.

HTH