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DES-3226 NWay Standalone Fast Ethernet Switch User’s Guide
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
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
Feature Default Value
Enable state STP enabled for all ports
Port priority 128
Port cost 100
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