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STP(Spanning-Tree Protocol) Timers

Hello timer

Hello timer is the time between each Bridge Protocol Data Unit(BPDU) that is sent on a port. This is equal to two seconds by default, but can be adjusted between 1 ~ 10 seconds.

Max Age

Max age timer controls the maximum length of time a bridge port saves its configuration BPDU information. This is 20 seconds by default and can be turned to adjusted between 6 ~ 40 seconds

Forward Delay

Forward delay timer is the time spent in the listening and learning stage. 15 seconds is default, but it can be adjusted between 4 ~ 30 seconds.