STP disabling edge ports

[MPerrino17]

Hello All,

I have a simple network of 3 switches in a triangle, and each switch as 1 PC connected.  How can I prevent STP from disabling the edge ports?  The only way I can prevent this is to plug the PC's to Switch's first and then connect the switches together.  Any ideas?

[Mark Malone]

Hi

Add spanning tree portfast and spanning tree bpduguard to the switch port interface where the pcs are connected

[MPerrino17]

Hi Mark, Thanks for your reply.  I tried that and still nothing.  Here is the show running-config for that port.

interface FastEthernet0/3

spanning-tree portfast

spanning-tree bpduguard enable

The port is not even listed in the show spanning-tree command

[pwwiddicombe]

If spanning-tree is shutting down ports, there should be an entry in the log to indicate the reason.  PC's have only one interface?

Spanning-tree portfast just allows the PC to connect to the network earlier rather than wait the learning time of ~ 40 seconds.  the bpduguard will shut down the port  if it sees BPDU packets, which a PC shouldn't be sending (unless you're running something odd on the PC?).