the issue of modify the STP timer
the STP timer can modify by diameter and hello,
when we modify by diameter the max age is reduce @paul driver (show you exact steps to do that )
so what ?
max age is time the BPDU vialed for SW, if the SW not receive new BPDU within this time then it declare that Root is dead,
so usually we adjuest the diameter with hello to make root send hello in small interval.
this modify of default cisco timer can cause issue,
why we build new network and it have two or three SW and we adjust the diameter,
later we add more SW making the diameter 7-10 this with you modify can cause that last SW in topology tree not receive any BPDU and never detect the root of STP,
so I prefer not play with timer.
thanks for all
