Blockage? -? This port is a non-designated port and does not participate in frame forwarding. This kind of port reception? BPDU？ Frame to determine the location and root of the root bridge switch? ID, what about the last activity? STP？ The port role played by each switch port in the topology.
Listening? -? STP？ According to what the switch has received so far? BPDU？ Frame, determine the port can participate in frame forwarding. At this point, the switch port will not only receive? BPDU？ Frame, it will send itself? BPDU？ A frame informing neighboring switches that the switch port is ready to join the active topology.
Study? -? Is the port ready to participate in frame forwarding and start filling? Mike. Address table.
Forward? -? This port is part of an active topology. It will forward, send and receive frames. BPDU？ Frame.
Disability? -? First one? 2? Layer ports do not participate in the spanning tree and do not forward frames. When a switch port is administratively closed, it will be disabled.
BPDU？ timer
How long does the port stay in each port country depend on? BPDU？ Timer. Only the switch as the root bridge can adjust the timer by sending information through spanning tree. Are the following timers determined? STP？ Performance and state transition:
Hello? time
Forwarding delay
Maximum aging time