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Chapter 8
Configuring Spanning Tree Protocol
If a bridge port is blocked, some broadcast or multicast packets can reach a forwarding port on the bridge
Note
and cause the bridging logic to switch the blocked port into listening state momentarily before the
packets are dropped at the blocked port.
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 in the spanning tree. An
interface in the disabled state is nonoperational.
A disabled interface performs as follows:
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OL-4059-01
Discards frames received on the port
Does not learn addresses
Receives BPDUs
Discards frames received on the port
Learns addresses
Receives BPDUs
Receives and forwards frames received on the port
Learns addresses
Receives BPDUs
Discards frames received on the port
Does not learn addresses
Does not receive BPDUs
Cisco Aironet 1400 Series Wireless Bridges Software Configuration Guide
Understanding Spanning Tree Protocol
8-7
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