Description: This indicates the current state of the Port Role Transition state machine. This object will hold the value 'init' when the Port Role Transition state machine is in the INIT state, the value 'disableport' when the state machine is in the DISABLE_PORT state, the value 'disabledport' when the state machine is in the DISABLED_PORT state, the value 'rootport' when the state machine is in the ROOT_PORT state, the value 'desgport' when the state machine is in the DESIGNATED_PORT state, the value 'backupport' when the state machine is in BACKUP_PORT state, the value 'rootproposed' when the state machine is in the ROOT_PROPOSED state, the value 'rootagreed' when the state machine is in the ROOT_AGREED state, the value 'reroot' when the state machine is in the REROOT state, the value 'rootforward' when the state machine is in the ROOT_FORWARD state, the value 'rootlearn' when the state machine is in the ROOT_LEARN state, the value 'rerooted' when the state machine is in the REROOTED state, the value 'designatedpropose' when the state machine is in the DESIGNATED_PROPOSE state, the value 'designatedsynced' when the state machine is in the DESIGNATED_SYNCED state, the value 'designatedretired' when the state machine is in the DESIGNATED_RETIRED state, the value 'designatedforward' when the state machine is in the DESIGNATED_FORWARD state, the value 'designatedlearn' when the state machine is in the DESIGNATED_LEARN state and the value 'designatedlisten' when the state machine is in the DESIGNATED_LISTEN state.