What is the Cisco Catalyst store-and-forward switching method?
In the store-and-forward switching method, the switch's incoming interface receives the entire frame before it forwards it. The switch computes the cyclic redundancy check (CRC) to make sure that the frame is not bad. If the frame is good, the switch forwards it. If the CRC is bad, the switch drops it. If the frame is a runt (less than 64 bytes, including the CRC) or a giant (more than 1518 bytes, including the CRC), the switch discards it. Because the switch stores the frame before forwarding it, latency is introduced in the switch. Latency through the switch varies with the size of the frame.