Forwarding State - Cisco 7604 Configuration Manual

Chapter 20 Configuring STP and Prestandard 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 20-6 Interface 2 in Forwarding State
A Layer 2 LAN port in the forwarding state performs as follows:
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•
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OL-4266-08
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.
Cisco 7600 Series Router Cisco IOS Software Configuration Guide, Release 12.2SX
Forwarding
Network
management
and data frames
Frame
forwarding
Network
management
and data frames
All segment
frames
Understanding How STP Works
Figure 20-6. The Layer 2 LAN
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