D-Link DES-3326 User Manual - page 58
Manual is about: 24-Port Fast Ethernet Plus 2-Port Gigabit Module Layer 3 Switch
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DES-3326 Layer 3 Fast Ethernet Switch User’s Guide
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Switch Management and Operating Concepts
Figure 5-3. STP Port State Transitions
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.
Default Spanning-Tree Configuration