| Name | Data Type | Default Value | Qualifiers |
| Name | Data Type | Value |
| TimeSinceTopologyChange | uint32 | |
| Description | string | The time since the last topology change was detected by the switch. |
| MappingStrings | string | MIB.IETF|BRIDGE-MIB.dot1dStpTimeSinceTopologyChange |
| PUnit | string | second * 10^-2 |
| Units | string | Hundredths of Seconds |
| TopChanges | uint32 | |
| Counter | boolean | true |
| Description | string | The total number of topology changes detected by the switch since the counter was last reset or initialized. |
| MappingStrings | string | MIB.IETF|BRIDGE-MIB.dot1dStpTopChanges |