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DES-3326S Layer 3 Fast Ethernet Switch User’s Guide
324 Understanding and Troubleshooting the Spanning Tree Protocol
Learning State
A port in the learning state prepares to participate in frame
forwarding. The port enters the learning state from the
listening state.
A port in the learning state does the following:
• Discards frames received from the network segment to
which it is attached.
• Discards packets sent from another port on the switch
for forwarding.
• Adds addresses to its forwarding database.
• Receives BPDUs and directs them to the CPU.
• Processes and transmits BPDUs received from the CPU.
• Receives and responds to network management
messages.