STP uses three timers to make sure that a network converges properly before a bridging loop can form.

Hello timer - The time INTERVAL between Configuration BPDUs sent by the root bridge. It is 2 seconds by default.

Forward Delay timer - The time interval that a switch port spends in both the Listening and LEARNING states.

The default VALUE is 15 seconds.

MAX (Maximum) Age timer - Maximum length of time a BPDU can be stored without receiving an update. It can also be define as a time interval that a switch stores a BPDU before discarding it. It is 20 seconds by default.

STP uses three timers to make sure that a network converges properly before a bridging loop can form.

Hello timer - The time interval between Configuration BPDUs sent by the root bridge. It is 2 seconds by default.

Forward Delay timer - The time interval that a switch port spends in both the Listening and Learning states.

The default value is 15 seconds.

Max (Maximum) Age timer - Maximum length of time a BPDU can be stored without receiving an update. It can also be define as a time interval that a switch stores a BPDU before discarding it. It is 20 seconds by default.