Planet GS-5220-24T4XVR User Manual page 141

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From listening to learning or to disabled
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From learning to forwarding or to disabled
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From forwarding to disabled
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From disabled to blocking
You can modify each port state by using management software. When you enable STP, every port on every 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 Switch allows for two levels of operation: the switch level and the port level. The 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.
User's Manual of GS-5220-24T4XV(R) Managed LCD Switch
Figure 4-3-4-1: STP Port State Transitions
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