User Manual UMN:CLI
V8102
367
• Blocking
A port that is enabled, however neither a Designated port nor a Root port, will be in
the blocking state. A blocking port will not receive or forward data frames, nor will it
transmit BPDUs, but instead it will listen to other’s BPDUs to determine if and when
the port should consider becoming active in the spanning tree.
• Listening
The port is still not forwarding data traffic, but is listening to BPDUs in order to
compute the spanning tree. The port is comparing its own information (path cost,
Bridge Identifier, Port Identifier) with the information received from other candidates
and deciding which is best suited for inclusion in the spanning tree.
• Learning
The port is preparing to forward data traffic. The port waits for a period of time to build
its MAC address table before actually forwarding data traffic. This time is the
forwarding delay.
• Forwarding
After learning address, it is allowed to forward data frame. This is the steady state
for a switch port in the active spanning tree.
• Disabled
When disabled, a port will neither receive nor transmit data or BPDUs. A port is in this
state because it is broken or disabled by administrator.
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