Forwarding State - Cisco 7609 Configuration Manual

Chapter 15 Configuring STP and IEEE 802.1s MST

Forwarding State

A Layer 2 LAN port in the forwarding state forwards frames, as shown in
port enters the forwarding state from the learning state.
Figure 15-6 Interface 2 in Forwarding State
A Layer 2 LAN port in the forwarding state performs as follows:
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All segment
frames
Port 1
Station
addresses
BPDUs
Filtering System
database module
BPDUs
Station
addresses
Port 2
Forwarding
Forwards frames received from the attached segment.
Forwards frames switched from another port for forwarding.
Incorporates end station location information into its address database.
Receives BPDUs and directs them to the system module.
Processes BPDUs received from the system module.
Receives and responds to network management messages.
Forwarding
Network
management
and data frames
Frame
forwarding
Network
management
and data frames
All segment
frames
Cisco 7600 Series Router Cisco IOS Software Configuration Guide—12.1E
Understanding How STP Works
Figure 15-6. The Layer 2 LAN
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