Spanning Tree reconvergence


failure	neighbor node send TCN BPDU toward the root bridge TCN: Topology Change Notification every 2 sec ( until acknowledge )
	TCN ACK BPDU
Change topology	Root bridge send: TC Flag in BPU ( TC: Topology Change )
All none-bridge	change the timer to 15sec ( to re-learn the MAC@) Mac address forwarding table Aging Timer = Fwd Delay Timer ( 15sec )
	if Mac@ has not been learn
if needed change root port

Juniper Switching