| Item | Description |
| InConfigBpdus | The number of Config BPDUS received. |
| InTcnBpdus | The number of Topology Change Notification BPDUS received. |
| InBadBpdus | The number of unknown or malformed BPDUS received. |
| OutConfigBpdus | The number of Config BPDUS transmitted. |
| OutTcnBpdus | The number of Topology Change Notification BPDUS transmitted. |