spanning-tree portfast trunk

[knaik99]

Switch is connected to router and on switch ,BPDU guard is enabled globally and on switch port going to router--we have command spanning-tree portfast trunk

and now switch port going to router is in error-disabled state so shall we remove command 

spanning-tree portfast trunk?

[Kasun Bandara]

what is the reason for err-disabled. you can se that on console, when plugs the cable between router and switch

[balaji.bandi]

what spanning tree running, if that is the router (as end device it has no effect)

is this single link or port-channel trunk ? what other config in the port  ? (show run interface x/x - post switch and router)

error disable can cause many reasons, so you need to see what is teh reason ?  show interfaces status err-disabled

[MHM Cisco World]

are you use the ethernet module of router or router-port ?

[knaik99]

Hi all,

i checked the switch port and we are seeing input errors and CRC errors .also I put command sh interfaces status error-disabled and it is showing reason link flap so Do i have to check physical layer?

[MHM Cisco World]

Yes sure, also check the MTU in both side.