v The expiration of the forwarding delay timer moves the port to the forwarding
state, where both learning and forwarding are enabled. At this point, packets are
forwarded by the port.
A port in the forwarding state does the following:
v Forwards packets received from the network segment to which it is attached.
v Forwards packets sent from another port on the switch for forwarding.
v Incorporates station location information into its address database.
v Receives BPDUs and directs them to the system CPU.
v Receives and responds to network management messages.
The following illustration shows the actions that occur when a port is in the
forwarding state.
CPU
Port 2
Port 2
Port 1Port 1
Forwarding
Database
Forwarding
Database
BPDUs
BPDUs
Addresses
Addresses
Forwarding
Data
Packets
Data
Packets
Network
Management
Packets
Network
Management
Packets
Network SegmentNetwork Segment
Network SegmentNetwork Segment
Switch
Fabric
Switch
Fabric
Learning
Appendix D. Understanding and troubleshooting the Spanning Tree Protocol 131
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