You were probably using Arista... "...Cut through mode reduces switch latency at the risk of decreased reliability. Packet transmissions can begin immediately

You were probably using Arista... "...Cut through mode reduces switch latency at the risk of decreased reliability. Packet transmissions can begin immediately after the destination address is processed. Corrupted frames may be forwarded because packet transmissions begin before CRC bytes are received..." https://www.arista.com/en/um-eos/eos-data-transfer?searchword=eos+section+44+3+configuring+lanz https://www.arista.com/en/um-eos/eos-data-transfer?searchwor...