9M426-02 Module Specific Information
6
The Blocking state is entered in either of two ways:
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Following initialization of the switch.
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From the Disabled state when management enables the
interface.
The Blocking state is exited in any of three ways:
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When a protocol timer expires.
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When a ConÞguration BPDU is received on this port or another
port.
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Through management action.
Listening
In the Listening state, an interface is preparing to forward trafÞc.
TrafÞc that is received is discarded.
Station location information is not added to the Filtering Database.
The Listening state is entered from the Blocking state, when the
Spanning Tree Algorithm and Protocol determines that the
interface should participate in forwarding trafÞc.
The Listening state is exited in any of three ways:
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When a protocol timer expires (the Learning state is then
entered).
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When a BPDU is received on this port or another port (the
Blocking state is then entered).
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Through management action (either the Blocking or the
Disabled state is then entered).
Learning
In the Learning state, an interface is preparing to forward trafÞc,
and is learning network addresses to minimize the forwarding of
unnecessary trafÞc.
TrafÞc that is received is discarded.
Station location information is added to the Filtering Database.
The Learning state is entered from the Listening state when a
protocol timer expires.
