Learning State - IBM BladeCenter Installation And User Manual

The following illustration shows the actions that occur when a port is in the listening
state.

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 does the following:
v Discards frames received from the network segment to which it is attached
v Discards packets sent from another port on the switch for forwarding
v Adds addresses to its forwarding database
v Receives BPDUs and directs them to the CPU
v Processes and transmits BPDUs received from the CPU
v Receives and responds to network management messages
Addresses
Forwarding Forwarding
Database Database
Discard
Data Data
Packets Packets
Appendix D. Understanding and troubleshooting the Spanning Tree Protocol
Network Segment Network Segment
Port 1 Port 1
Forwarding
Network Network
Management Management
BPDUs
Packets Packets
CPU
BPDUs
Port 2 Port 2
Listening
Network Segment Network Segment
BPDUs
Data Data
Packets Packets
Switch Switch
Fabric Fabric
129