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Spanning Tree Protocol
• Does not transmit BPDUs received from the CPU.
• Receives and responds to network management messages.
Figure D-1: Blocking State
Listening State
The listening state is the first transition for a port from the blocking state. Listening is an
opportunity for the switch to receive BPDUs that may tell the switch that the port should not
continue to transition to the forwarding state, but should return to the blocking state (that is, a
different port is a better choice).
There is no address learning or packet forwarding from a port in the listening state.
D-2 HP ProLiant BL e-Class C-GbE Interconnect Switch User Guide
HP CONFIDENTIAL Codename: DeLorean Part Number: 263682-002 Last Saved On: 2/5/03 10:46 AM