Listening State; Learning State - D-Link DES-3350SR User Manual

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.
A port in the listening state does the following:
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Discards frames received from the network segment to which it is attached.
•
Discards packets sent from another port on the switch for forwarding.
•
Does not add addresses to its forwarding database
•
Receives BPDUs and directs them to the CPU.
•
Processes BPDUs received from the CPU.
•
Receives and responds to network management messages.

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:
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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.
D-Link DES-3350SR Standalone Layer 3 Switch
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