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C
4
HAPTER
A
T
DVANCED
OPICS
The SMC6724L2 supports Layer 2 switching and other advanced
features which are described in this chapter.
Layer 2 Switching
When a frame enters a port, its destination MAC address is
checked in the address database to see which port leads to this
destination. If the destination address belongs to the incoming
port, the frame is dropped or "filtered." If the destination port is
found on another port, the frame is forwarded to that port and
queued for output. But, if the destination address is not found in
the address database, the frame is sent to one or more output ports
based on the rules for handling tagged or untagged VLAN frames.
If the source MAC address of the frame was not found in the
address database, it is recorded along with the incoming port
number where it entered the switch. This information is then used
to make later decisions for frame forwarding.
During switching, the switch performs multiple steps, including:
N VLAN Classification
N Learning
N Filtering
N Forwarding
N Aging
4-1
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