Refer to the exhibit.

The transit_delay = 5 and bpdu_delay = 20 are recommended values, considering hello_timer = 2 and specified diameter.

Only the maximum_transmission_halt_delay and diameter parameters are configurable parameters in 802.1d to speed up STP convergence process.

The max_age and forward_delay parameters can be adjusted to speed up STP convergence process.

Only the transit_delay and bpdu_delay timers are configurable parameters in 802.1d to speed up STP convergence process.