Hi Rene
It is a great lesson to understand the Topology change on the STP. I have a question which is related to the switches which receives only BPDU with TCN flag set from the Root bridge
Assume that Switch network has few more switches and TCN notification generated by switch ( switch A on the diagram) has not been pass through on these switches . I need to know what would be the mac address aging time for the other switches which receives BPDU’s with TCN flag set. My understanding is if a switch in the switch network received the TCN from the Root bridge the switch set the mac address aging time to max-age in the STP.
My other question is, due to some reason when switch does not receive the BPDU, will this switch wait for Max age time (20s) by default to flush the Mac-address table? Then how the STP reconvergence will affect the switch network
Regards
Chandi