Listening State; Learning State; Forwarding State; Disabled State - Cisco Catalyst 2950 Software Manual

Chapter 9 Configuring STP

Listening State

The listening state is the first state an interface enters after the blocking state. The interface enters this
state when STP determines that the interface should participate in frame forwarding.
An interface in the listening state performs as follows:
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Learning State

An interface in the learning state prepares to participate in frame forwarding. The interface enters the
learning state from the listening state.
An interface in the learning state performs as follows:
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Forwarding State

An interface in the forwarding state forwards frames. The interface enters the forwarding state from the
learning state.
An interface in the forwarding state performs as follows:
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Disabled State

An interface in the disabled state does not participate in frame forwarding or STP. An interface in the
disabled state is nonoperational.
A disabled interface performs as follows:
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Discards frames received on the port
Discards frames switched from another interface for forwarding
Does not learn addresses
Receives BPDUs
Discards frames received on the port
Discards frames switched from another interface for forwarding
Learns addresses
Receives BPDUs
Receives and forwards frames received on the port
Forwards frames switched from another port
Learns addresses
Receives BPDUs
Discards frames received on the port
Discards frames switched from another interface for forwarding
Does not learn addresses
Does not receive BPDUs
Catalyst 2950 Desktop Switch Software Configuration Guide
Understanding Basic STP Features
9-7