%STP-I-EDGEPORT: Attention: port gi(X) from which the bpdu was received is configured as Fast Port

[Odys (CSC)]

Hello guys,

There are two switches sw1 and sw2 connected to each other with a trunk.

sw1 config

interface gigabitethernet11
 switchport trunk allowed vlan add 7575,12

sw2 config

interface gigabitethernet22

 spanning-tree portfast
 spanning-tree bpdu filtering

 switchport trunk allowed vlan add 7575,12

I'm getting this attention on sw2

%STP-I-EDGEPORT: Attention: port gi22 from which the bpdu was received is configured as Fast Port

Is this bad ? Should I be concerned ? What would be the consequences of leaving the config as it is now ?

[Mark Malone]

Hey you need to remove the 2 below commands there for access ports not trunks that should stop the log occurring

spanning-tree portfast
 spanning-tree bpdu filtering

[Peter Paluch]

Mark,

Sorry, I've had my reply in writing for quite some time and didn't know you've posted your own. I didn't mean to intrude.

Best regards,
Peter

[Mark Malone]

Not intruding at all Peter always good for the poster to have it confirmed by multiple people

[Peter Paluch · Accepted solution]

Hi,

It seems that the attention message is formulated in an unfortunate way. What it is saying is this: A BPDU has been received on Gi22 but Gi22 is configured as a PortFast port - that is, an edge port - and should never be receiving BPDUs. A PortFast port should only be connected to an end host that does not perform switching, and obviously, does not run STP.

It seems that the switch is right: According to your description, your Gi22 port is a trunk port connected to another switch. Therefore, it is not an edge port (connecting to an end host) and it should never, ever, be configured with PortFast.

I suggest removing both the BPDU Filter and PortFast configuration from your Gi22 port. Otherwise, you're risking a switching loop in case there are redundant links in your topology.

Best regards,
Peter

[Odys (CSC)]

Thank both of you Mark and Peter ^^

I know it's improper to keep those two commands. I've actually asked how bad is that and what are the consequences.

Peter has cleared it up to me.

Garry