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Chapter 7
Configuring Spanning Tree
Learning State
A port in the learning state prepares to participate in frame forwarding. The port enters the learning state
from the listening state.
Figure 7-5
A port in the learning state performs as follows:
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•
•
•
•
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78-12647-02
Figure 7-5
Port 2 in Learning State
All segment
frames
Port 1
Station
addresses
BPDUs
Filtering
System
database
module
Station
addresses
BPDUs
Data
frames
Port 2
Learning
BPDU and network
management frames
Discards frames received from the attached segment.
Discards frames switched from another port for forwarding.
Incorporates station location into its address database.
Receives BPDUs and directs them to the system module.
Receives, processes, and transmits BPDUs received from the system module.
Receives and responds to network management messages.
Software Configuration Guide—Catalyst 4000 Family, Catalyst 2948G, Catalyst 2980G, Releases 6.3 and 6.4
shows a port in the learning state.
Forwarding
Network
management
and data frames
Frame
forwarding
Network
management
frames
All segment
frames
How Spanning Tree Protocols Work
7-9
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