| STP State |
The Port Can... |
The Port Cannot... |
Duration |
| Disabled |
N/A |
Send or receive data |
N/A |
| Blocking |
Receive BPDUs |
Send or receive data or
learn MAC addresses |
Indefinite if loop has been detected |
| Listening |
Send and receive BPDUs |
Send or receive data or
learn MAC addresses |
Forward Delay timer
(15 seconds) |
| Learning |
Send and receive BPDUs
and learn MAC addresses |
Send or receive data |
Forward Delay timer
(15 seconds) |
| Forwarding |
Send and receive BPDUs,
learn MAC addresses,
and send and receive data |
|
Indefinite as long as port is
up and loop is not detected |
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