Planet FGSW-2840 User Manual page 114

A port transitions from one state to another as follows:
 From initialization (switch boot) to blocking.
 From blocking to listening or to disabled.
 From listening to learning or to disabled.
 From learning to forwarding or to disabled.
 From forwarding to disabled.
 From disabled to blocking.
You can modify each port state by using management software. When you enable STP, every port on every Managed Switch in
the network goes through the blocking state and then transitions through the states of listening and learning at power up. If
properly configured, each port stabilizes to the forwarding or blocking state. No packets (except BPDUs) are forwarded from, or
received by, STP enabled ports until the forwarding state is enabled for that port.
2. STP Parameters
STP Operation Levels
The Managed Switch allows for two levels of operation: the Managed Switch level and the port level. The Managed Switch level
forms a spanning tree consisting of links between one or more switches. The port level constructs a spanning tree consisting of
groups of one or more ports. The STP operates in much the same way for both levels.
Figure 4-5-1: STP Port State Transitions
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User's Manual of FGSW-2840 / FGSW-4840S