Learning State - Cisco 7604 Configuration Manual
Ios software configuration guide
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Understanding How STP Works
Learning State
A Layer 2 LAN port in the learning state prepares to participate in frame forwarding. The Layer 2 LAN
port enters the learning state from the listening state.
learning state.
Figure 20-5 Interface 2 in Learning State
A Layer 2 LAN port in the learning state performs as follows:
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Cisco 7600 Series Router Cisco IOS Software Configuration Guide, Release 12.2SX
20-10
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 end 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.
Chapter 20
Figure 20-5
Forwarding
Network
management
and data frames
Frame
forwarding
Network
management
frames
All segment
frames
Configuring STP and Prestandard IEEE 802.1s MST
shows a Layer 2 LAN port in the
OL-4266-08
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