Foundry NetIron M2404C and M2404F Metro Access Switches
Configuring STP (Rev. 03)
Spanning Tree Protocol (STP)
© 2008 Foundry Networks, Inc.
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Discards frames switched from another port for forwarding
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Does not learn addresses
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Receives BPDUs.
Listening State
The listening state is the first state a port enters after the blocking state. The port enters this state
when STP determines that the port should participate in frame-forwarding.
A port in the listening state performs as follows:
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Discards frames received on the port
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Discards frames switched from another port for forwarding
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Does not learn addresses
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Receives BPDUs.
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 performs as follows:
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Discards frames received on the port
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Discards frames switched from another port for forwarding
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Learns addresses
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Receives BPDUs.
Forwarding State
A port in the forwarding state forwards frames. The port enters the forwarding state from the
learning state.
A port in the forwarding state performs as follows:
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Receives and forwards frames received on the port
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Forwards frames switched from another port
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Learns addresses
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Receives BPDUs.
Disabled State
A port in the disabled state does not participate in frame forwarding or STP. A port in the disabled
state is non-operational.
A disabled port performs as follows:
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Discards frames received on the port
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Discards frames switched from another port for forwarding
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Does not learn addresses
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Does not receive BPDUs.