bpdu frame on access port

[JM0945]

Hello,
On a 5510 switch, I have bpdu frames on an interface when I scan with wireshark.
The stp edge port feature is enabled on it.

Every 2 seconds, the switch sends bpdu frames on the interface.  The computer connected to the interface receives them every 2 seconds.
Here is the port configuration:

port link-mode bridge
port access vlan X
stp edged-port

The stp bpdu-protection feature is disabled

My question :
On an interface configured as stp edge port, I should not receive bpdu frames? The switch should not send these frames out?

thanks for your reply

Regards.

[Ivan_B · Accepted solution]

HI @JM0945 !

It is expected. STP edge doesn't mean the port must stay silent and sends no BPDUs, rather it means that we do not expect any inbound BPDU from the connected device. However, our switches keep sending BPDUs in order to detect any miswiring or misconfiguration. Like if somebody connects a switch to an edge port, we can inform that device as fast as we can (stp hello interval) that we speak STP. Also, even if that device is unmanaged switch that is STP-agnostic, but creates a loop, we can easily detect it, because we will start getting our own BPDUs back on this edge port.