Switches running PAgP are classified as either physical learners or aggregate learners. These two device types are described in the following sub-sections.
PAgP Physical Learners
PAgP physical learners are switches that learn MAC addresses using the physical ports within the EtherChannel instead of via the logical EtherChannel link. Physical learners forward traffic to addresses based on the physical port via which the address was learned. In other words, the switch will send packets to the neighboring switch using the same port in the EtherChannel from which it learned the source address. Figure 5-4 below illustrates a switch using . . .
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