How a switch conveys that the brige priority is made lower compared to the present root briges ?

[binojbaby1984]

If there are there switches connected in a full mesh topology say A ,B, C having same bridge priority . After stp convergence  A has become the root bridge

if i change the bridge priority of B , how this information will be conveyed, to my knowledge other than root bridge no switches will generate bpdu by themselves it will simply relay by changing the sender bridge id once stp convergence is over .? can you guys please let me know 

[Eduardo Corzo]

Hi,

It depends most of the STP protocol you have running; BPDUs packets are sent in different times (for example, RSTP is faster than STP because it has only 3 states). According to this, switches sent BPDU packets in a certain time. When hosts discover another switch with best priority, STP run again in order to re-converged the network and elect news root, designated and block ports

I hope it could explain, if not, maybe I could do a little topology.

Best regards.

-Eduardo