An Overview of the Normal LAN Switch Forwarding Process
Chapter 1 of this book reviewed the logic a LAN switch uses when forwarding frames. However, that list described the logic without STP. The following process steps outline that logic, with added notes that focus on the impact of STP on the switch forwarding process:
Step 1. Determine the VLAN in which the frame should be forwarded, as follows:
A. If the frame arrives on an access interface, use the interface’s access VLAN.
B. If the frame arrives on a trunk interface, use the VLAN listed in the frame’s trunking header.
Step 2. If the incoming interface is in an STP learning or forwarding state in that VLAN, add the source MAC address to the MAC address table, with incoming interface and ...
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